Pythagorean Theorem Calculator
Use this pythagorean theorem calculator to find a missing side of a right triangle. Enter the two known side lengths of a right triangle and review the unknown side length and the calculation steps.
Result
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Area —
Perimeter —
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How it works
c = √(a² + b²); missing leg: a = √(c² − b²)How to use the Pythagorean Theorem Calculator
Start by entering the two known side lengths of a right triangle. Keep the units consistent and check that each value belongs to the same question.
The result gives the unknown side length and the calculation steps. The theorem applies only to right angled triangles. Use it as a guide and check any instructions, rules or professional advice that apply.
Frequently Asked Questions
What does this pythagorean theorem calculator calculate?
It gives the unknown side length and the calculation steps. The theorem applies only to right angled triangles.
What information should I enter?
Enter the two known side lengths of a right triangle. Use the same units throughout so the result is easier to understand.
Can I use this for any triangle?
No. The Pythagorean theorem is for right angled triangles.