Free Maths Calculators

Simple, fast calculators for everyday maths and school work. Every tool runs in your browser — no sign-up, no downloads, and nothing is sent to a server. Each tool page also explains how to use it, with a worked example and common mistakes to avoid.

Calculators

Percentage Calculator

Find a percentage of a number, a percentage share, or percentage change.

Discount Calculator

Find the final price and the amount saved in a sale.

Age Calculator

Your exact age in years, months and days, including leap years.

Scientific Calculator

Trigonometry, logs, powers, roots, factorial, memory and Deg/Rad modes.

Average Calculator

Mean, median, sum, count, smallest and largest values.

Area Calculator

Area of a rectangle, circle or triangle.

Time Duration Calculator

Difference between two dates and times in days, hours and minutes.

Guides

Start with the tool you need, and use the guides when you want to understand the method behind the answer.