# Pythagorean Theorem Calculator

> Pythagorean theorem calculator: solve for any right triangle side from a, b, or c with the steps shown. Free, private, runs in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/pythagorean-theorem-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** August 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Hypotenuse c = sqrt(a^2 + b^2); legs: a = sqrt(c^2 - b^2).

## Worked example

Legs 3 and 4: hypotenuse 5, the classic 3-4-5 right triangle.

## Sources

- [Calculation methodology and verification standard](/methodology/)

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