Pythagorean Theorem Calculator – Find the Hypotenuse
Calculate the hypotenuse of a right triangle from the two perpendicular side lengths using c = √(a²+b²).
Use the Pythagorean theorem when a and b are the perpendicular sides of a right triangle. The calculator returns the hypotenuse c in the same length unit as the inputs.
How it works
c = √(a² + b²).
Example
For a = 3 and b = 4, c = √(9 + 16) = 5.
How to use
- Enter side a.
- Enter perpendicular side b.
- Calculate the hypotenuse.
- Use the same unit for both input sides.
Key features
- Right-triangle hypotenuse calculation
- Non-negative side validation
- Unit-agnostic when both inputs match
- Transparent formula
Common uses
- Geometry homework
- Diagonal checks
- Right-triangle examples
Frequently asked questions
Can I use different units for a and b?
No. Convert both sides to the same unit before calculating.
Does this work for non-right triangles?
No. The Pythagorean theorem applies to right triangles.
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