100% Free • No sign-up required
Free Online Calculators
Quick everyday maths — an exact age, a percentage, a BMI reading or the days between two dates.
100% freeEvery tool, with no limits
Privacy focusedRuns in your browser, not our server
Easy to useOpen it and go — no account
Calculators
5 tools · free · no sign-up
Age Calculator
Exact age in years, months and days, plus the next birthday.
Use toolPercentage Calculator
Percentage of a number, change and reverse percentages.
Use toolBMI Calculator
Body mass index from height and weight, metric or imperial.
Use toolDays Between Dates
Count the days, weeks and months between any two dates.
Use toolUnit Converter
Length, weight, temperature, area and speed in one place.
Use tool
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Why use these free online tools?
Nothing to installEverything runs in the browser tab you already have open.
Works on any deviceDesktop, tablet or phone — the same tools, same result.
Private by defaultYour files and text are processed locally, not uploaded.
Kept up to dateTools get fixed and improved as issues come up.