Everyday calculators
Date, percentage, random number, password, shoe size, and daily life tools
19 calculators
Everyday calculators are the ones you reach for a few times a year and then forget the formula again: how many days until something, what percentage a change represents, what an appliance actually costs to run, how much rent you can carry on your income.
None of them need an account and all of them show the arithmetic, so you can check the answer rather than trust it. Where a tool depends on today's date, it says so. And the shareable link you copy will recalculate against the day it is opened.
Start with these in Everyday
Percentage CalculatorSolve every common percentage problem: a percentage of a number, one number as a percentage of another, percentage change, and increases or decreases.EverydayDate CalculatorCount 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.EverydayPower Bill CalculatorCalculate your electricity cost by appliance. Enter wattage and daily usage to see monthly and annual power bill costs at your electricity rate.EverydayRent Affordability CalculatorCalculate how much rent you can afford based on your income, the 30% rule, and monthly expenses. Also shows bond and move-in costs.EverydayDays Until CalculatorCalculate how many days, weeks, and months until any future date. Or since any past date. Perfect for countdowns to events, deadlines, and milestones.EverydayTip 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.Everyday
Every Everyday calculator
19 calculators
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- Age CalculatorWork 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.
- Aspect Ratio CalculatorReduce 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.
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- Date CalculatorCount 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 CalculatorCalculate how many days, weeks, and months until any future date. Or since any past date. Perfect for countdowns to events, deadlines, and milestones.
- Discount CalculatorCalculate 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.
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- Password GeneratorGenerate 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.
- Percentage CalculatorSolve every common percentage problem: a percentage of a number, one number as a percentage of another, percentage change, and increases or decreases.
- Percentage Change CalculatorWork out the percentage increase or decrease between two values, with the multiplier, the reverse change and the size of the change in plain numbers.
- Power Bill CalculatorCalculate your electricity cost by appliance. Enter wattage and daily usage to see monthly and annual power bill costs at your electricity rate.
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- Random Number GeneratorDraw one or more uniformly random whole numbers from any range, using the browser's cryptographic random source rather than a predictable pseudo-random sequence.
- Rent Affordability CalculatorCalculate how much rent you can afford based on your income, the 30% rule, and monthly expenses. Also shows bond and move-in costs.
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- Screen PPI CalculatorWork 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.
- Shoe Size ConverterConvert between US men's, US women's, UK and EU shoe sizes, or work every size out from a measured foot length in centimetres.
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Questions about everyday calculators
- Why does a date calculator sometimes disagree with my own count?
- Most disagreements are about whether the start and end days are both counted. These tools count whole days between the two dates, so a Monday-to-Friday span is four days, not five. Business-day counts additionally skip weekends but cannot know your local public holidays, which is the other common source of a one or two day gap.
- How accurate is the power bill calculator?
- It is exact for the inputs you give it: watts, hours and your tariff. The uncertainty is in those inputs. Appliance nameplates state maximum draw rather than typical draw, fridges and air conditioners cycle rather than run continuously, and many retail plans mix peak, shoulder and off-peak rates plus a daily supply charge. Take your rate from a recent bill for the closest result.
- Is the percentage calculator doing percentage change or percentage of?
- Both, as separate modes. Percentage of a number answers questions like what is 15% of 80. Percentage change compares two numbers and reports the movement between them, which is the one people most often get backwards: an increase from 40 to 50 is a 25% rise, while a fall from 50 to 40 is a 20% drop, even though both are a difference of ten.