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Pythagorean theorem calculator
Find the missing side of a right triangle: a² + b² = c².
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About Pythagorean theorem calculator
Enter any two sides of a right triangle to find the third using a squared + b squared = c squared, where c is the hypotenuse, the side opposite the right angle. Builders use it to check square corners; the classic 3-4-5 triangle is the quickest example.
How to use Pythagorean theorem calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
How do I find a leg if I know the hypotenuse?
Subtract the known leg squared from the hypotenuse squared, then take the square root. With c = 13 and a = 5, b = sqrt(169 - 25) = 12.
Is Pythagorean theorem calculator free?
Yes. Pythagorean theorem calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.