Pythagorean Theorem Calculator
Use this free pythagorean theorem calculator to work out the missing side of a right triangle. Enter your numbers and the results update as you type. It runs in your browser, so nothing you enter is uploaded, and there is nothing to sign up for.
Runs in your browser. Your files never leave your device.
Leave one of the three at 0 to find it.
How it works
- 01Enter your numbers in the fields.
- 02The results update as you type.
- 03Change a value to compare what-if cases.
Questions
What is the Pythagorean theorem?
In a right triangle, the square of the longest side (the hypotenuse) equals the sum of the squares of the other two sides: a² + b² = c².
Is my data saved or sent anywhere?
No. The calculation runs in your browser and nothing is uploaded.
Are the results exact?
The maths is exact for the values you enter, but real life can differ because of fees, taxes and changing rates. Use the result as a guide.
Is my file uploaded to a server?
No. Everything happens inside your browser on your own device. Your files are never sent to us or anyone else.
Is it free?
Yes. It is free to use, with no signup, no watermark and no daily limit.