Overview
What Is a Right Triangle Calculator?
This tool solves for a right triangle's missing side or angle using trigonometric ratios, given two known values.
Solve right triangle sides and angles instantly.
This tool solves for a right triangle's missing side or angle using trigonometric ratios, given two known values.
Useful for solving right triangle problems involving sides and angles.
Input the two legs of the right triangle.
All missing values update automatically.
Using the Pythagorean theorem: c = √(a²+b²)
Using inverse trigonometric functions (arctan) based on the ratio of the two legs.
Yes, since all three angles in any triangle sum to 180°, and one is already 90°.
This calculator is designed for two-side input - other combinations would need different trigonometric approaches.
Related but broader - this also calculates angles, not just the missing side.
No, calculations happen entirely in your browser.
Yes, decimal measurements are fully supported.
Yes, right triangle calculations are common in construction for verifying square corners and calculating diagonal measurements.
You could rearrange the Pythagorean theorem to find the other leg, though this calculator specifically takes the two legs as input.
Yes, completely free with no sign-up required.