About Everyday Maths
Everyday Maths is a collection of free calculators for everyday tasks: checking a sale price, comparing figures, planning dates or estimating take-home pay.
See how the result is calculated
The arithmetic tools show their formulas and worked examples. Salary calculators break down the estimated taxes and deductions, with notes on what is included and what is left out.
Using the site
You do not need an account. Enter your figures, select Calculate and copy the result if you need it elsewhere. Calculations run in your browser; the numbers you enter are not sent to us.
Know the limits
A salary estimate may differ from a payslip. Date and time tools do not account for time zones, and discount calculations exclude taxes and fees. Each page explains its assumptions so you can decide whether the result suits your purpose.