Quick Tools
BMI Calculator
Check your body mass index in metric or imperial units and see the healthy weight range for your height.
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Category
Quick Tools
Everyday calculators you can open, use and close in under a minute - no sign-up, no app install, everything runs in your browser.
- 8 resources
- Free, no sign-up
- More added regularly
Quick Tools
Small calculators, ready to use
Each one opens straight into the tool. No accounts, no downloads, and nothing you type leaves your browser.
Quick Tools
Percentage Calculator
Work out a percentage of a number, what one number is as a percentage of another, and percentage change.
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Quick Tools
Age Calculator
Find your exact age in years, months and days, plus total days lived and the countdown to your next birthday.
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Quick Tools
Unit Converter
Convert length, weight, temperature, volume, speed and data sizes with live results and a swap button.
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Quick Tools
Tip Calculator
Work out the tip, the total and the amount per person, with rounding options for splitting a bill.
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Quick Tools
Percentage Increase Calculator
Find the percentage increase between two numbers, or raise any value by a percentage.
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Quick Tools
Percentage Decrease Calculator
Find the percentage decrease between two numbers, or reduce any value by a percentage.
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Quick Tools
Discount Calculator
Work out the sale price, the amount you save and what stacked discounts are really worth.
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How these tools are built
Every calculator here runs entirely in your browser using plain JavaScript. That means results appear as you type, the page works on a weak connection, and the numbers you enter are never sent to a server or stored anywhere.
Each tool also has an explanation underneath it: how the calculation works, where it is commonly misread, and which related tool you probably want next. The tool comes first and the reading is optional - the opposite of most calculator pages.