Pythagorean Theorem Calculator
Solve any right triangle in seconds. Enter any two sides and the third is found automatically, or enter all three to check whether the triangle satisfies the Pythagoras theorem — with a clear diagram showing the hypotenuse and legs.
Enter values — the result will show here live.
How to use
- Enter any two of the three sides and leave the third empty — the missing side is found automatically.
- Enter all three sides and the tool will check whether the triangle satisfies the Pythagoras theorem.
- Remember: side c is always the hypotenuse (opposite the 90-degree angle), and a and b are the two legs.
Note: Formula: a² + b² = c². The hypotenuse is always longer than each leg; if a leg is entered longer than the hypotenuse, the calculation is not possible.