Pythagoras Theorem 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 Pythagoras Theorem Calculator
- Enter any two sides of a right triangle into the input fields labeled Side a (adjacent), Side b (opposite), and Side c (hypotenuse). Leave the side you want to calculate empty.
- Values must be positive numbers (e.g., 3, 4.5). No units needed—just enter the numeric length.
- Click the "Calculate" button. The result will appear below, showing the missing side’s value and the formula used.
- If you enter more or fewer than two sides, or if the hypotenuse is not greater than the other side, an error message will guide you.
Example: To find the hypotenuse, enter a = 3 and b = 4, leave c empty, then click Calculate. Result: c = 5.
Previous Results
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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 the lengths of any two sides of a right triangle, leave the unknown side empty, and click Calculate. The missing side will be computed automatically.
Yes, enter side a and side b, leave side c empty, and the calculator will compute the hypotenuse using c = √(a² + b²).
