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Right Triangle Calculator

Solve any right triangle — input any 2 sides or 1 side + 1 angle

a (opposite A) b (opposite B) c (hypotenuse, opposite C=90°)
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Triangle solved

About the Right Triangle Calculator

This right triangle calculator solves for all missing sides and angles of a right triangle (C = 90°). Enter any two sides, or one side and one non-right angle, and the calculator instantly computes the remaining values using the Pythagorean theorem and trigonometric functions.

The Formula

a² + b² = c² (Pythagorean theorem)   sin(A)=a/c   cos(A)=b/c   tan(A)=a/b   A + B = 90°

Frequently Asked Questions

What makes a triangle a "right" triangle?

A right triangle has one 90° angle (the right angle). The side opposite the right angle is the longest side, called the hypotenuse. The other two sides are called legs. The Pythagorean theorem relates the three sides.

Can I use degrees and radians interchangeably?

Yes — use the Degrees / Radians toggle above the form. If you enter an angle in degrees, make sure the toggle is set to Degrees. The calculator will display results in the same unit you selected.