Pythagorean Calculator
Calculate the missing side of a right triangle using the Pythagorean theorem. Input any two sides to find the third.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Pythagorean Theorem Calculator
This calculator computes the missing side of a right triangle using the formula a² + b² = c², where c is the hypotenuse (the longest side).
- Enter any two side lengths into the fields labeled Side a, Side b, and Hypotenuse c. Leave the unknown side blank.
- Use positive numbers only (e.g., 3, 4.5). The calculator works with any unit (inches, cm, etc.)—just keep them consistent.
- Click the Calculate button.
- The result shows the missing side length rounded to 4 decimal places, along with the formula used.
Note: If you enter an invalid combination (e.g., a hypotenuse smaller than a leg), you’ll see a warning. Ensure the hypotenuse is the largest value.
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Frequently Asked Questions
The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (c) equals the sum of squares of the other two sides (a and b): a² + b² = c².
Enter any two side lengths (a, b, or c) and leave the third field empty. Click 'Calculate' to find the missing side.
You must enter exactly two sides. If you enter all three, the calculator will prompt you to leave one empty.
