Right Triangle Calculator

Use this right triangle calculator to find the hypotenuse, solve a missing leg and view area, perimeter and acute angles in one place. It works well for homework, construction planning, technical drawing, measurements and any quick check based on the Pythagorean theorem.

Enter any two known sides of the triangle. You can use both legs to calculate the hypotenuse, or one leg plus the hypotenuse to solve the other leg. If you already know all three sides, the tool also checks whether they match a valid right triangle.

Besides the missing side, the result includes both acute angles, the area and the perimeter. That makes it easier to compare dimensions, review geometry exercises and confirm measurements before moving to estimating, cutting or layout work.