Calculate percentages, BMI, age, dates and everyday values — plus unit, length, weight and temperature conversions — with easy online calculators.
Everyday maths — tips, percentages, ages, dates, BMI, unit conversions — should not require a spreadsheet.
This hub collects the general-purpose calculators you reach for at work, school and home.
Percentage Calculator handles X% of Y, percentage change and reverse percentage questions. Unit Converter covers length, weight and temperature with the formula shown for every result. Age Calculator and Date Difference Calculator give calendar-aware answers rather than rough year estimates.
Tip Calculator splits bills fairly; Average Calculator handles mean, median and mode for quick stats. All of them run in the browser with instant results and no signup.
If you need finance-specific modelling (loans, compound interest, ROI), jump to the Finance hub; if you need health screening numbers, start with the BMI Calculator and read its limitations.
8 tools
Calculate exact age in years, months, and days.
Calculate body mass index from weight and height.
Find X% of a number, what percent one number is of another, and percentage change.
Split bills and calculate tips per person.
Convert length, weight and temperature between metric and imperial units.
Compute mean, median, min, max and sum of a number list.
Count down to any date and time, or from a number of seconds — free online timer.
Count years, months, days and weeks between two dates.
Advertisement