Pythagorean Theorem Calculator
Enter any two sides of a right triangle to find the missing side, area, and perimeter.
Results
Formula: a² + b² = c²
About the Pythagorean Theorem Calculator
What is the Pythagorean Theorem?
The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides: a² + b² = c².
How to Use
Enter any two side lengths and leave the third blank. The calculator automatically detects which side to solve for and displays the result along with area and perimeter.
Can this calculator solve for the hypotenuse?
Yes. Enter the two shorter sides (A and B) and leave C blank. The calculator will compute the hypotenuse using c = �?a² + b²).
Can I solve for a leg if I know the hypotenuse?
Yes. Enter the hypotenuse and one leg, leaving the other leg blank. The calculator uses a = �?c² - b²).
What if I enter all three sides?
The calculator will verify whether a² + b² = c² and classify the triangle accordingly.
Is this calculator free?
Yes, BestCalc's Pythagorean theorem calculator is completely free with no ads or registration required.