Pythagorean Theorem Calculator
a squared plus b squared equals c squared
Missing side
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Area
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Perimeter
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📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Free Pythagorean theorem calculator
Solve any right triangle using the Pythagorean theorem (a² + b² = c²). Find hypotenuse or missing leg.
How to use this tool
- 1
Pick which side to solve for
c (hypotenuse), or a/b (legs).
- 2
Enter the other two
Known sides.
- 3
Get the missing side
Plus area and perimeter of the right triangle.
Frequently Asked Questions
What is the Pythagorean theorem?
For a right triangle with legs a, b and hypotenuse c: a² + b² = c².
Which side is the hypotenuse?
The longest side, opposite the right angle (90°).
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