How to use this calculator
Solve for a missing leg or hypotenuse in a right triangle when the other two sides are known.
How the calculation works
- Enter two side lengths and leave one side blank.
- The calculator applies a² + b² = c².
- The missing side is solved with a square root.
Formula
a² + b² = c².
Example
With legs 3 and 4, the hypotenuse is 5.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- c is the hypotenuse and must be the longest side.
- Leave exactly one side blank.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.