Calculators

214 free calculators, one place

Finance, Australian tax, health, trade, farming, cooking and more. Type what you need. Every calculator shows its formula, its assumptions and what each number actually means.

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Fuel Cost Calculator

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.

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A hand-picked set of the tools people most often need. This list switches to real usage once enough people have used the site.

Loan Repayment CalculatorCalculate monthly repayments, total interest and the full amortisation schedule for any personal, car or business loan.FinanceBMI CalculatorCalculate your Body Mass Index and see where you fall on the health scale.Health & FitnessPercentage CalculatorSolve every common percentage problem: a percentage of a number, one number as a percentage of another, percentage change, and increases or decreases.EverydayCompound Interest CalculatorSee how savings grow with compound interest and regular contributions, at any compounding frequency, with the year-by-year breakdown.FinanceTip CalculatorWork out the gratuity, the total and each person's share of a restaurant bill, with the option to tip on the pre-tax amount.EverydayMortgage CalculatorEstimate your monthly mortgage repayment including principal, interest, rates and insurance, with the full amortisation schedule.FinanceCalorie CalculatorDetermine your daily calorie needs based on your goals and activity level.Health & FitnessProfit Margin CalculatorCalculate gross profit margin, net profit margin and the equivalent markup on cost from revenue, cost of goods sold and operating expenses.Business & Operations

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Everyday19Date, percentage, random number, password, shoe size, and daily life toolsFinance38Loan, mortgage, paycheck, 401k, inflation, investment, and tax calculatorsAustralian Finance19Superannuation, HECS/HELP, stamp duty, CGT, and Centrelink toolsHealth & Fitness24BMI, TDEE, macro, keto, pregnancy, sleep, and wellness calculatorsEducation2GPA, grade, and academic calculatorsHome & Garden11Home affordability, solar savings, paint, flooring, and improvement toolsFarming & Agriculture19Livestock, crop yield, soil pH, fencing, spray rates, hay/silage, and paddock toolsAuto & Travel4Fuel cost, fuel efficiency, and trip planner calculatorsTrade & Construction13Concrete, electrical, plumbing, tile, and building calculatorsBusiness & Operations17Freelance rate, employee cost, pricing, cash flow, and operations toolsTech & IT7Cloud cost, cybersecurity, downtime, and tech debt calculatorsLegal & Compliance3Litigation cost, GDPR fine risk, and tribunal cost estimatorsEmployment & Pay9Annual leave, long service leave, overtime, redundancy, notice period and dismissal calculatorsMath & Conversion10Percentage, fraction, algebra, temperature, length, and weight convertersScience3Physics, chemistry, and scientific calculation toolsCooking & Kitchen12Cup converters, baking subs, oven temps, recipe scaling, and kitchen toolsStatistics4Standard deviation, probability, regression, and analysis tools

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How Calc Hub works

Four promises every calculator on this site keeps, whichever one you open.

Every answer shows its working

Each calculator exposes its formula, a step-by-step substitution and worked examples, so you can check the maths rather than trust a number.

Nothing is stored about you

Calculations run in your browser. No account is needed and your inputs are never sent anywhere. Privacy page.

Shareable, saveable results

Your inputs appear in the page address after you calculate, so the link you copy reproduces the result exactly. Save a result and it waits for you in this browser.

Dated and sourced

Tools with legislated figures show the year they apply to, when they were last reviewed and where the numbers came from. How we check them.