All calculators A-Z
The complete list of 214 calculators. Filter to narrow it down, or jump to a letter.
214 calculators
#
A
- Accounts Receivable Aging CalculatorBusiness & Operations. Analyse your receivables ageing, estimate the bad debt allowance, and see days sales outstanding before overdue invoices become a cash crunch.
- After-Tax Cost of Debt CalculatorFinance. Apply the interest tax shield to a borrowing rate: after-tax cost of debt equals the interest rate multiplied by one minus the effective tax rate, with the dollar shield over the full term.
- Age CalculatorEveryday. Work out your exact age in years, months and days from your date of birth, with total days and weeks lived and a countdown to your next birthday.
- Alcohol Dilution CalculatorCooking & Kitchen. Work out exactly how much water or lower-strength liquid to add to bring a spirit down to a target ABV, using the Pearson square and correcting for volume contraction.
- Annual Leave CalculatorEmployment & Pay. Work out how much annual leave you have accrued under the National Employment Standards from your hours per week and time worked, in hours, days and dollars, with leave loading.
- APR to APY ConverterFinance. Convert a nominal annual rate into the effective annual yield for any compounding frequency, including continuous, so savings and loan quotes can be compared fairly.
- Area CalculatorHome & Garden. Calculate the area of a rectangle, circle, triangle or trapezoid, with the perimeter, diagonal and a ten per cent material allowance.
- Aspect Ratio CalculatorEveryday. Reduce any pixel resolution to its simplest aspect ratio, resize it to a target width without distortion, and see how much letterboxing it causes on a 16:9 screen.
- Australian Income Tax CalculatorAustralian Finance. Calculate your Australian income tax, Medicare levy and low income tax offset using current ATO brackets, with the bracket-by-bracket breakdown.
B
- BAC CalculatorHealth & Fitness. Educational estimate of blood alcohol concentration using the Widmark formula. Never use it to decide whether to drive.
- Baking Substitution CalculatorCooking & Kitchen. Find the right substitute for eggs, butter, buttermilk, raising agents, flour and sugar, scaled to the exact amount your recipe calls for.
- Blood Pressure Category CalculatorHealth & Fitness. Enter your systolic and diastolic readings to find your blood pressure category, from normal and elevated through hypertension stage 1 and 2, with guidance on what to do next.
- BMI CalculatorHealth & Fitness. Calculate your Body Mass Index and see where you fall on the health scale.
- BMR CalculatorHealth & Fitness. Calculate your Basal Metabolic Rate. The calories your body burns at rest.
- Body Fat Percentage CalculatorHealth & Fitness. Estimate your body fat percentage using the US Navy method.
- Borrowing Power CalculatorAustralian Finance. Estimate how much an Australian lender would let you borrow for a home loan from your after-tax income, living expenses, other debts and the APRA assessment buffer.
- Bread Hydration CalculatorCooking & Kitchen. Turn baker's percentages into exact gram weights for flour, water, salt and yeast, including the flour and water already sitting in your levain or biga.
- Break-Even CalculatorBusiness & Operations. Work out how many units you must sell to cover fixed and variable costs, using contribution margin, plus the volume needed to hit a target profit.
- Brick and Block CalculatorTrade & Construction. Work out how many bricks or blocks a wall needs, with mortar, sand and cement quantities, for Australian, UK and US brick sizes.
- Budget Planner CalculatorFinance. Plan a monthly household budget, see your surplus and savings rate, and measure your spending against the 50/30/20 guideline used by Australian financial counsellors.
- Business Insurance EstimatorBusiness & Operations. Estimate your annual business insurance premium from revenue, headcount, industry, claims history and coverage level.
- Business Loan CalculatorFinance. Calculate weekly, fortnightly or monthly repayments on a business term loan or interest-only facility, including establishment fees, the total interest cost and the principal left owing at the end.
C
- Caffeine Intake CalculatorCooking & Kitchen. Add up the caffeine in a day of coffee, tea, energy drinks and soft drink, compare it to the published daily guideline, and see how much is still circulating hours later.
- Calorie CalculatorHealth & Fitness. Determine your daily calorie needs based on your goals and activity level.
- Calories Burned CalculatorHealth & Fitness. Estimate calories burned during various exercises and activities.
- Capital Gains Tax CalculatorAustralian Finance. Calculate Australian capital gains tax on shares or property, including the 50% discount for assets held over twelve months.
- Car Loan CalculatorFinance. Calculate monthly car repayments, total interest and the true cost of a vehicle after deposit and trade-in.
- Car Loan vs Lease CalculatorFinance. Compare buying a car on finance against leasing it on a cost-per-month basis, allowing for the deposit, a balloon payment, the lease upfront and what the car is still worth at the end.
- Car Running Cost CalculatorAustralian Finance. Calculate the true yearly, monthly and per kilometre cost of owning a car in Australia, including fuel, insurance, registration, servicing, tyres, finance interest and depreciation.
- Cash Flow Forecast CalculatorBusiness & Operations. Project your business cash flow over 12 months with revenue growth, expense increases, and one-time costs.
- CD Ladder CalculatorFinance. Model a real CD or term deposit ladder where each rung has a different maturity and rolls into the longest term, against locking everything into one long deposit.
- Centrelink Income Test CalculatorAustralian Finance. Estimate how much a Centrelink payment reduces under the income test, using the current fortnightly rate and taper for your payment type.
- Cloud Cost Comparison CalculatorTech & IT. Compare estimated monthly AWS, Azure and Google Cloud bills for the same workload, including egress charges and the effect of one and three year commitments.
- Compound Interest CalculatorFinance. See how savings grow with compound interest and regular contributions, at any compounding frequency, with the year-by-year breakdown.
- Concrete Slab Calculator (cubic metres and bags)Trade & Construction. Work out the cubic metres of concrete in a rectangular slab, the ready-mix order with a waste allowance, the equivalent 20 kg bag count, the mass and the cost.
- Concrete Volume CalculatorTrade & Construction. Calculate how much concrete a slab, footing or path needs in cubic yards, cubic metres and bag counts, with a waste allowance and a delivery weight.
- Constructive Dismissal Compensation CalculatorEmployment & Pay. Estimate a UK constructive dismissal award where an employer's fundamental breach of contract forced you to resign, including the Acas Code adjustment.
- Cost Per Hectare CalculatorFarming & Agriculture. Add up cropping input costs per hectare, then see the break-even yield at your grain price, the break-even price at your expected yield and the gross margin.
- Credit Card Payoff CalculatorFinance. See how long a credit card balance takes to clear, what it costs in interest, and how much faster paying extra gets you there.
- Crop Rotation Nitrogen Credit CalculatorFarming & Agriculture. Work out the nitrogen a legume break crop leaves behind, the urea still needed for the following crop, and what the rotation saves in fertiliser.
- Crop Yield EstimatorFarming & Agriculture. Estimate total production, gross income and gross margin per hectare for a grain crop, then find the break-even yield and cost of production per tonne that tell you whether the paddock pays.
- Crypto Tax Calculator (Australia)Australian Finance. Estimate Australian capital gains tax when you sell, swap or spend crypto, with the 50 per cent discount for assets held twelve months or more and your real marginal rates.
- Cup ConverterCooking & Kitchen. Convert cups between the US customary cup, the 240 mL US legal cup, the 250 mL metric cup used in Australia and New Zealand, and the 284 mL UK imperial cup.
- Cups to Grams ConverterCooking & Kitchen. Convert cups to grams for flour, sugar, butter and other baking ingredients, allowing for the cup standard and how tightly the cup was filled.
- Currency ConverterFinance. Convert between eight major currencies using indicative mid-market rates, with the bank spread and card fees shown so you can see the real cost.
- Customer Churn Rate CalculatorBusiness & Operations. Calculate customer churn, convert it to monthly and compounded annual rates, and see the revenue and lifetime value it costs you.
D
- Data Breach Cost EstimatorTech & IT. Estimate the total and out-of-pocket cost of a data breach from record count, sector, containment speed, automation maturity and insurance cover.
- Data Storage ConverterMath & Conversion. Convert a file or drive size between bytes and every decimal and binary unit, and see how long it takes to transfer at a given connection speed.
- Date CalculatorEveryday. Count the days, weeks, calendar months and working days between any two dates, with the weekday each date falls on and a live countdown from today.
- Days Until CalculatorEveryday. Calculate how many days, weeks, and months until any future date. Or since any past date. Perfect for countdowns to events, deadlines, and milestones.
- Debt Consolidation CalculatorFinance. Compare paying your existing card and loan balances off at your current payment against rolling them into one consolidation loan, including the fee, so you can see whether consolidating actually costs less.
- Debt Payoff CalculatorFinance. Compare the snowball and avalanche methods across up to three debts, with the payoff order, months to debt free, total interest and what your extra payment is really worth.
- Deck Materials CalculatorTrade & Construction. Count decking boards, joists, joist timber and screws for a rectangular deck from board width, gap, board length and joist spacing.
- Discount CalculatorEveryday. Calculate the sale price, the saving and the true effective discount when a coupon stacks on a sale, then add sales tax or GST for the checkout figure.
- Discrimination Compensation CalculatorEmployment & Pay. Estimate compensation for a UK discrimination claim using the April 2026 Vento bands for injury to feelings plus uncapped financial loss and interest.
- Dividend Yield CalculatorFinance. Calculate dividend yield, annual income and the grossed-up value of Australian franked dividends, then apply your real marginal rate to find the cash refund or extra tax.
- Dog Age CalculatorHealth & Fitness. Convert your dog's age to human years using modern formulas that account for breed size.
- Download Time CalculatorTech & IT. Work out how long a file takes to transfer at a given connection speed, handling the bits-versus-bytes conversion that makes downloads look slower than the plan.
- DRIP CalculatorFinance. Model dividend reinvestment against taking the cash, tracking shares, share price and dividend per share separately so the compounding is not double counted.
E
- Egg Production CalculatorFarming & Agriculture. Estimate daily, weekly and annual egg output from flock size, breed, hen age and season, with hen day lay rate and the feed cost behind every dozen.
- Electrical Load CalculatorTrade & Construction. Work out real and apparent power for single or three-phase circuits and the next standard breaker rating under NEC, AS/NZS 3000 or BS 7671 rules.
- Emergency Fund CalculatorFinance. Calculate your recommended emergency fund size based on expenses, dependents, and job stability.
- Employee Cost CalculatorBusiness & Operations. Calculate the true total cost of an employee beyond their base salary, including benefits, taxes, and overhead.
- Employment Tribunal Cost EstimatorLegal & Compliance. Estimate the total cost of an employment tribunal claim to an employer: the likely award, legal fees, management time and the value of settling early.
- Energy CalculatorScience. Calculate kinetic energy, gravitational potential energy or work done, and convert the answer into kilojoules, kilowatt-hours, calories and BTU.
- EV vs Petrol Cost CalculatorAustralian Finance. Compare the running and ownership cost of an electric car with a petrol car in Australia: energy cost per 100 km, home and public charging, servicing, the break-even point and total cost.
F
- Fence Post and Rail CalculatorTrade & Construction. Count fence posts, gate posts, rails, palings and concrete bags for a straight run or closed boundary, from post spacing and hole size.
- Fencing Materials CalculatorFarming & Agriculture. Estimate strainer assemblies, line posts, wire length, wire rolls and materials cost for a paddock boundary or a straight fence run.
- Fertiliser Application CalculatorFarming & Agriculture. Turn a soil test nutrient target in kilograms per hectare into a product rate, a spreader plan and a cost, using the elemental N-P-K-S analyses printed on Australian fertiliser labels.
- FIDE Chess Rating CalculatorEveryday. Estimate the FIDE Elo rating change from up to three games using expected score, the 400 point rating difference cap and the K-factor that applies to you.
- Final Grade CalculatorEducation. Work out the mark you need on a final exam to reach a target course grade, with the best and worst course grade you can still finish on.
- First Home Buyer CalculatorAustralian Finance. Work out the cash you need to buy your first home in Australia: deposit, transfer duty after first home concessions, lenders mortgage insurance, grants and the repayment on the loan.
- Flooring CalculatorHome & Garden. Work out how many boxes of timber, laminate or vinyl plank flooring a room needs, with waste set by the laying pattern, the room shape and any pattern matching.
- Fraction CalculatorMath & Conversion. Add, subtract, multiply and divide fractions, then see the answer simplified, as a mixed number, as a decimal and as a percentage.
- Franking Credits CalculatorAustralian Finance. Calculate the grossed-up value of Australian franked dividends, the franking credit attached, and whether you receive a refund or owe top-up tax.
- Freelance Hourly Rate CalculatorFinance. Work backwards from the take-home pay you want to the hourly rate you must charge, allowing for Australian tax, the Medicare levy, unbillable hours, holidays, expenses and super.
- Freelance Rate CalculatorBusiness & Operations. Calculate your ideal freelance hourly rate based on income goals, taxes, expenses, and desired profit margin.
- Freezer Storage GuideCooking & Kitchen. Find how long a food keeps its quality in the freezer at -18 °C, adjusted for your actual freezer temperature and packaging, with thawing and refreezing advice.
- Fuel Cost CalculatorAuto & Travel. Work out what a trip will cost in fuel from distance, fuel economy and price, one way or return, split between passengers, in metric, US or UK units.
- Fuel Efficiency CalculatorAuto & Travel. Measure your real fuel economy from distance and fuel used, convert it between L/100km, US mpg and UK mpg, and compare it with the official label figure.
G
- GDPR Fine Risk CalculatorLegal & Compliance. Estimate regulatory fine exposure under EU or UK GDPR from turnover, the number of data subjects affected, severity and whether you self-reported.
- Gear Ratio CalculatorTrade & Construction. Calculate gear ratio, output speed, torque multiplication and transmitted power for a gear pair, including the losses at each mesh.
- GPA CalculatorEducation. Work out your grade point average from course grades and credit weights on the US 4.0 or 4.3 scale or the Australian 7-point or 4-point scale, and combine it with an earlier cumulative GPA.
- Growing Degree Days CalculatorFarming & Agriculture. Calculate daily and accumulated growing degree days (thermal time) with base and upper cut-off temperatures, and estimate days to reach a crop stage.
- GST CalculatorBusiness & Operations. Add GST or VAT to a price, or extract the tax from a tax-inclusive total, using presets for Australia, New Zealand, the UK, Europe, Canada, Singapore, India and South Africa.
H
- Harvest Yield EstimatorFarming & Agriculture. Estimate standing grain yield from head counts, grains per head and thousand grain weight, then adjust for harvest loss, receival moisture and test weight.
- Hay & Silage Feed CalculatorFarming & Agriculture. Budget hay or silage for a feeding period: tonnes needed including wastage, bale numbers, bales per head, total cost and cost per head per day.
- Heart Rate Zones CalculatorHealth & Fitness. Work out your five training heart rate zones using the Karvonen heart rate reserve method or a straight percentage of maximum.
- HECS-HELP Repayment CalculatorAustralian Finance. Work out your compulsory HECS-HELP repayment under the marginal repayment system, and how long your study loan takes to clear.
- Hiring Cost CalculatorBusiness & Operations. Calculate the true first-year cost of a new employee: salary, on-costs, recruiting, training and the productivity lost while they ramp up.
- Home Affordability CalculatorHome & Garden. Work out the highest home price your income, debts, deposit and settlement cash actually support, using the 28/36 ratios lenders apply.
- Hourly to Salary ConverterFinance. Convert between hourly wages and annual salary with all pay period breakdowns.
- Hours CalculatorEveryday. Work out the hours and minutes between two times, subtract unpaid breaks, and convert the result to decimal hours and pay.
- HVAC BTU CalculatorTrade & Construction. Size an air conditioner from room dimensions using the published capacity table, adjusted for ceiling height, insulation, sun exposure, occupancy and kitchens.
I
- Ideal Weight CalculatorHealth & Fitness. Calculate your ideal body weight using multiple formulas.
- Inflation CalculatorFinance. Calculate the impact of inflation on purchasing power over time.
- Insulation R-Value CalculatorTrade & Construction. Find the recommended R-value for your US climate zone, how much to add over what you have, the depth by material and the metric RSI equivalent.
- Intermittent Fasting CalculatorHealth & Fitness. Calculate your intermittent fasting eating window and fasting times for popular IF protocols: 16:8, 18:6, 20:4, 5:2, and OMAD.
- Investment Property CalculatorFinance. Work out gross and net rental yield, weekly cash flow after vacancy and management fees, the tax deduction from a rental loss and the real after-tax cost of holding an Australian investment property.
- Investment Return CalculatorFinance. Calculate total and annualised return on an investment including income, so holdings of different lengths can be compared fairly.
- IPv4 Subnet CalculatorTech & IT. Turn an IP address and CIDR prefix into the network address, broadcast address, usable host range and subnet mask.
- Irrigation Water CalculatorFarming & Agriculture. Calculate the megalitres needed to apply a given depth of water to a paddock, allowing for system efficiency, then the pumping hours and the cost of the water at your delivery rate.
- IT Downtime Cost CalculatorTech & IT. Work out what an outage really costs by separating lost staff productivity, net revenue lost and recovery labour, then scale it to an annual exposure.
K
- Karmic Debt Numerology CalculatorEveryday. Reduce a birth date, and optionally a birth name, to find the karmic debt numbers 13, 14, 16 and 19 alongside the life path, birthday and expression numbers.
- Keto Macro CalculatorHealth & Fitness. Set ketogenic macro targets from a fixed net carb limit, a protein target scaled to body weight, and fat filling the remaining calories.
L
- Length ConverterMath & Conversion. Convert a length between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles using exact factors.
- Lifetime Health Cover Loading CalculatorAustralian Finance. Estimate the Australian Lifetime Health Cover loading on private hospital cover: two per cent for each year past 30, capped at 70 per cent, with the premium and rebate effect.
- Litigation Cost EstimatorLegal & Compliance. Estimate the total cost of running a civil claim, including solicitor fees, counsel, experts, court fees and the risk of paying the other side's costs.
- Livestock Feed CalculatorFarming & Agriculture. Build a supplementary or drought feed budget for a mob: dry matter intake, as fed kilograms per head per day, tonnes for the whole feeding period, bales required and the cost per head per day.
- Livestock Gestation CalculatorFarming & Agriculture. Work out expected birth dates and the normal calving, lambing or farrowing window for cattle, sheep, goats, pigs, horses and alpacas from the joining date.
- Livestock Weight Gain CalculatorFarming & Agriculture. Work out average daily gain, feed required, feed conversion and the true cost per kilogram of liveweight gain for cattle, sheep or pigs.
- Loan Repayment CalculatorFinance. Calculate monthly repayments, total interest and the full amortisation schedule for any personal, car or business loan.
- Long Service Leave CalculatorEmployment & Pay. Work out long service leave accrued in NSW, Victoria, Queensland, WA, SA, Tasmania, the ACT or the NT, when it can be taken, when a pro-rata payout applies and what it is worth.
M
- Macronutrient CalculatorHealth & Fitness. Calculate your daily calorie target and protein, carbohydrate and fat grams from your body stats, activity level and goal.
- Marketplace Seller Fee and Profit CalculatorFinance. Work out what you actually keep after Etsy, eBay, Depop, Whatnot or Poshmark fees, payment processing, shipping and cost of goods, and find the sale price that breaks even.
- Markup CalculatorBusiness & Operations. Build a selling price from unit cost and a markup percentage, and see the gross margin, overhead and net profit that markup actually produces.
- Meal Cost CalculatorCooking & Kitchen. Work out what a home-cooked serve really costs once ingredients, energy and your own time are counted, and compare it against the takeaway price for the same meal.
- Mean, Median, Mode CalculatorMath & Conversion. Paste a data set and get the mean, median, mode, range, quartiles and interquartile range, with the sorted list laid out so you can see the middle.
- Merchant Cash Advance CalculatorBusiness & Operations. Work out the true cost of a merchant cash advance: total payback, daily holdback, repayment time and the real annualised rate.
- Mortgage CalculatorFinance. Estimate your monthly mortgage repayment including principal, interest, rates and insurance, with the full amortisation schedule.
- Mortgage Offset CalculatorFinance. See how much interest an offset account saves, how many years earlier the loan clears, and what pre-tax savings rate you would need to beat it.
- Moving Cost EstimatorHome & Garden. Estimate a local or interstate move from shipment weight, distance and service level, and compare doing it yourself against hiring a full-service carrier.
- Mulch, Soil and Gravel CalculatorHome & Garden. Work out how many cubic metres or yards of mulch, soil, gravel or sand a garden bed or path needs, and what it weighs.
N
- Negative Gearing CalculatorAustralian Finance. Calculate the tax benefit and real cash cost of a negatively geared Australian investment property, week by week.
- Net Worth CalculatorFinance. Add up everything you own and everything you owe to get your net worth, plus the liquidity and concentration ratios lenders and advisers actually look at.
- Notice Period Pay CalculatorEmployment & Pay. Work out UK statutory or contractual notice entitlement and the pay due for it, including pay in lieu of notice and holiday accrued during the period.
- NPV and IRR CalculatorBusiness & Operations. Evaluate a capital investment with net present value, internal rate of return, profitability index and discounted payback period.
- Number Base ConverterTech & IT. Convert numbers between decimal, binary, hexadecimal, and octal simultaneously. Essential for programming, computer science, and digital electronics students.
O
- Ohm's Law CalculatorScience. Solve voltage, current, resistance or power for a DC circuit, with milliamps, energy per day and the resistor power rating you should fit.
- One Rep Max CalculatorHealth & Fitness. Estimate your one-rep max based on weight and reps performed.
- Oven Temperature ConverterCooking & Kitchen. Convert oven temperatures between Fahrenheit, Celsius and UK gas marks, with the fan-forced setting that runs about 20 degrees Celsius lower.
- Overtime Pay CalculatorEmployment & Pay. Work out a week's gross pay with overtime at time-and-a-half and double time, plus Sunday and public holiday penalty rates, from your base rate and hours worked.
- Ovulation CalculatorHealth & Fitness. Estimate your likely ovulation date and fertile window from your cycle length and last period. Not a contraceptive method.
P
- Paint CalculatorHome & Garden. Work out how much paint, primer and ceiling paint a room needs from the spread rate on the tin, the number of coats and the wall surface, then round it up to real tin sizes.
- Password GeneratorEveryday. Generate a genuinely random password from a character set you choose, and see its strength measured in bits of entropy rather than a vague colour bar.
- Pay-in-4 BNPL True Cost CalculatorFinance. Work out what a Buy Now Pay Later pay-in-4 plan really costs once late fees are added, and compare it against paying upfront or putting the same purchase on a credit card.
- Paycheck CalculatorFinance. Estimate your take-home pay after taxes and deductions from your gross paycheck.
- Payslip and Paystub Field EstimatorFinance. Estimate the gross, tax, superannuation and net figures on a single pay period using Australian resident rates or a flat United States withholding percentage.
- Percentage CalculatorEveryday. Solve every common percentage problem: a percentage of a number, one number as a percentage of another, percentage change, and increases or decreases.
- Percentage Change CalculatorEveryday. Work out the percentage increase or decrease between two values, with the multiplier, the reverse change and the size of the change in plain numbers.
- Plumbing Pipe Flow CalculatorTrade & Construction. Estimate water flow and velocity through a pipe with the Hazen-Williams equation, allowing for fittings, lift and the pressure you need at the outlet.
- Power Bill CalculatorEveryday. Calculate your electricity cost by appliance. Enter wattage and daily usage to see monthly and annual power bill costs at your electricity rate.
- Pregnancy Due Date CalculatorHealth & Fitness. Estimate your due date and pregnancy milestones based on your last menstrual period.
- Pricing Strategy CalculatorBusiness & Operations. Compare cost-plus, competitive, and value-based pricing strategies to find the optimal price for your product or service.
- Private Health Insurance vs MLS CalculatorAustralian Finance. Compare the Medicare levy surcharge you would pay without private hospital cover against the real cost of the cheapest eligible policy, including any Lifetime Health Cover loading.
- Probability CalculatorStatistics. Turn favourable and total outcomes into a probability, a percentage, odds and decimal odds, then extend it across repeated independent trials.
- Profit Margin CalculatorBusiness & Operations. Calculate gross profit margin, net profit margin and the equivalent markup on cost from revenue, cost of goods sold and operating expenses.
- Property Rental Yield CalculatorAustralian Finance. Calculate the gross and net rental yield on an Australian investment property, the rent you actually collect after vacancy, and your cash flow after loan interest.
- Property Tax CalculatorHome & Garden. Estimate annual and monthly US property tax from market value, assessment ratio, mill rate and exemptions, and project it forward under an assessment cap.
- Protein Intake CalculatorHealth & Fitness. Work out a daily protein target from your body weight, activity and goal, and see it split across meals.
- Pythagorean Theorem CalculatorMath & Conversion. Find the missing side of a right triangle from the other two, plus the area, perimeter and both acute angles, in metric or imperial units.
Q
R
- Rainfall & Soil Moisture CalculatorFarming & Agriculture. Estimate how much of a rainfall event is stored in the root zone for your soil type and ground cover, how full the profile is afterwards and how many days of crop water it holds.
- Random Number GeneratorEveryday. Draw one or more uniformly random whole numbers from any range, using the browser's cryptographic random source rather than a predictable pseudo-random sequence.
- Ratio CalculatorMath & Conversion. Simplify a ratio, solve for a missing value, scale a ratio up or down, and split a total into ratio parts.
- Recipe ScalerCooking & Kitchen. Scale recipe ingredients up or down for any number of servings, with a separate sub-linear factor for salt, spices and other seasonings.
- Refinance Break-Even CalculatorFinance. Work out how many months it takes to recover the cost of refinancing a mortgage, and whether a lower rate over a longer term actually costs you more.
- Renovation ROI CalculatorHome & Garden. Work out how much of a renovation you get back at resale, allowing for the project type, the age of the work and the ceiling price in your street.
- Rent Affordability CalculatorEveryday. Calculate how much rent you can afford based on your income, the 30% rule, and monthly expenses. Also shows bond and move-in costs.
- Rent Split CalculatorHome & Garden. Split shared rent fairly by room size, by income, evenly or on a blend of size and income, and see every method side by side.
- Rent vs. Buy CalculatorFinance. Compare the total cost of renting versus buying a home over different time horizons.
- Retirement Savings CalculatorFinance. Project your retirement balance and test it against the income you want, using the 4% withdrawal rule.
- Road Trip Planner CalculatorAuto & Travel. Plan a road trip with drive time, rest breaks, days on the road, refuelling stops and fuel cost from distance, speed, economy and tank size.
- Roasting Time CalculatorCooking & Kitchen. Work out roasting time by weight for chicken, turkey, duck, beef, pork and lamb, with the oven setting, the safe internal temperature and the resting time.
- ROI CalculatorBusiness & Operations. Calculate return on investment and the annualised equivalent for any business decision, marketing spend, property or share holding.
- Roman Numeral ConverterMath & Conversion. Convert between Roman numerals and regular numbers instantly. Converts both directions. Numbers to Roman numerals and Roman numerals to numbers.
- Roof Pitch and Rafter CalculatorTrade & Construction. Convert roof pitch between ratio and degrees, then get rafter length, ridge height and the true roof area including the slope factor.
- Running Pace CalculatorHealth & Fitness. Calculate pace, finish time, or distance for running.
S
- SaaS Gross Margin CalculatorBusiness & Operations. Calculate SaaS gross margin and contribution margin from monthly recurring revenue, cost of revenue and variable selling costs.
- Salary After Tax CalculatorAustralian Finance. Calculate your Australian take-home pay after income tax, Medicare levy, study loan repayments and salary sacrifice, per week, fortnight, month and year.
- Salary CalculatorFinance. Convert a wage between annual, monthly, fortnightly, weekly, daily and hourly rates, add the employer retirement contribution, and see the true hourly rate behind a salary.
- Salary Sacrifice CalculatorFinance. Work out the real tax saving from salary sacrificing into Australian superannuation using the 2026-27 brackets, the Medicare levy, the concessional cap, Division 293 and the HELP trap most calculators miss.
- Sample Size CalculatorStatistics. Work out how many responses a survey needs for a given confidence level and margin of error, with the finite population correction applied.
- Savings Goal CalculatorFinance. Work out how much to save each month to reach a target amount by a deadline, allowing for interest on what you have already saved.
- Screen PPI CalculatorEveryday. Work out a display's pixel density in PPI, then convert it to pixels per degree at your actual viewing distance, which is what really decides whether pixels are visible.
- Seed Rate CalculatorFarming & Agriculture. Work out the seeding rate in kilograms per hectare from your target plant density, thousand grain weight, germination and field establishment, then price the seed for the whole paddock.
- Shoe Size ConverterEveryday. Convert between US men's, US women's, UK and EU shoe sizes, or work every size out from a measured foot length in centimetres.
- Simple Interest CalculatorFinance. Calculate interest earned or charged on a fixed principal without compounding, and compare it against the compound equivalent.
- Sleep CalculatorHealth & Fitness. Find your optimal bedtime based on sleep cycles to wake up feeling refreshed.
- Sleep Cycle CalculatorHealth & Fitness. Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed by timing your alarm to the end of a sleep cycle.
- Soil pH and Lime Rate CalculatorFarming & Agriculture. Work out the lime rate needed to lift soil pH, adjusted for soil texture, incorporation depth, the neutralising value of the product and the pH scale your test used.
- Solar Panel Savings CalculatorHome & Garden. Model rooftop solar payback the way it actually works: self-consumption at the retail rate, exports at a collapsed feed-in tariff, and panel degradation year by year.
- Sole Trader Tax CalculatorAustralian Finance. Calculate tax for an Australian sole trader or freelancer: net business income, income tax, the small business income tax offset, Medicare levy, PAYG instalments and GST registration.
- Speed Distance Time CalculatorScience. Solve for speed, distance or time from the other two, in kilometres or miles, with pace per kilometre and every common speed unit.
- Spray Dilution CalculatorFarming & Agriculture. Work out how much chemical goes in each tank fill, how many fills a paddock takes, the part-tank mix for the last fill and the total product to buy.
- Stair Rise and Run CalculatorTrade & Construction. Work out riser height, tread going, stringer length and pitch for a flight of stairs, and check the result against building code limits.
- Stamp Duty CalculatorAustralian Finance. Estimate transfer (stamp) duty on an Australian property purchase in any state or territory, including first home buyer concessions.
- Standard Deviation CalculatorStatistics. Calculate sample and population standard deviation, variance, mean and standard error for any list of numbers, with the working shown.
- Startup Burn Rate CalculatorBusiness & Operations. Calculate gross and net burn, then project runway month by month with your revenue and cost growth trends to find the real zero-cash date.
- Statutory Redundancy Pay CalculatorEmployment & Pay. Work out UK statutory redundancy pay from age, length of service and weekly pay, using the £751 weekly cap and £22,530 maximum in force from April 2026.
- Stocking Rate CalculatorFarming & Agriculture. Work out a safe stocking rate and carrying capacity in Dry Sheep Equivalents from growing season rainfall, pasture type and the class of stock you run.
- Superannuation CalculatorAustralian Finance. Project your superannuation balance at retirement from your salary, current balance and contributions, using the 12% super guarantee.
- Swimming Pool Volume CalculatorHome & Garden. Calculate the volume of a rectangular, round or oval pool in litres and gallons, and the chlorine dose it needs.
T
- Tablespoon and Teaspoon ConverterCooking & Kitchen. Convert tablespoons and teaspoons between the 20 mL Australian tablespoon, the 15 mL tablespoon used everywhere else, dessertspoons and millilitres.
- Tax Refund EstimatorFinance. Estimate a US federal refund or balance due for tax year 2026, comparing withholding against tax on taxable income, with head of household included.
- TDEE CalculatorHealth & Fitness. Calculate your Total Daily Energy Expenditure from three published equations and see what you burn at rest and through activity.
- Technical Debt Cost CalculatorTech & IT. Express technical debt as the team capacity it consumes: developer-equivalents lost, engineering weeks gone, and the remediation budget that pays for itself in a year.
- Temperature ConverterMath & Conversion. Convert any temperature between Celsius, Fahrenheit, Kelvin and Rankine, with the landmark reference points that let you sanity-check the answer.
- Tile CalculatorTrade & Construction. Work out tiles and boxes to order with the grout joint and wastage included, plus tile adhesive and grout quantities for floors and walls.
- Tip CalculatorEveryday. Work out the gratuity, the total and each person's share of a restaurant bill, with the option to tip on the pre-tax amount.
- Tip Pool and Tip Split CalculatorFinance. Split a shared tip pool across up to five staff by hours worked and role weight, after card processing and any kitchen tip-out, with the rate per weighted hour.
- Typing Speed CalculatorEveryday. Calculate your typing speed in WPM, adjusted WPM, accuracy, and characters per minute.
- Tyre Size Comparison CalculatorAuto & Travel. Compare two tyre sizes for overall diameter, sidewall height, revolutions per kilometre and the speedometer error a change introduces.
U
- Unfair Dismissal Compensation CalculatorEmployment & Pay. Estimate a UK unfair dismissal award: the statutory basic award plus the compensatory award for actual loss, with the April 2026 caps applied.
- Unit Price Comparison CalculatorEveryday. Compare up to three package sizes on price per unit to find which is genuinely cheaper, not just which looks bigger.
- Unpaid Wages Claim CalculatorEmployment & Pay. Work out what you are owed in unpaid wages, overtime and holiday pay under UK law, check the rate against the minimum wage and see the claim deadline.
V
W
- Waist-to-Height Ratio CalculatorHealth & Fitness. Divide your waist by your height to screen for central body fat. A simple measure that works across different builds better than BMI.
- Water Intake CalculatorHealth & Fitness. Calculate your recommended daily water intake based on weight and activity.
- Water Tank & Dam Volume CalculatorFarming & Agriculture. Calculate the volume of a round tank, rectangular tank or farm dam with sloped batters in litres, kilolitres and megalitres, plus days of supply at your daily draw.
- Weekly to Calendar-Month Rent Calculator (AU)Australian Finance. Convert Australian weekly rent to a per calendar month figure using the 52 divided by 12 convention, plus daily rent, pro-rata amounts and the four-week bond.
- Weight ConverterMath & Conversion. Convert a mass between milligrams, grams, kilograms, tonnes, ounces, pounds, stones and US short tons using exact defined factors.