Enter any two right-triangle sides and solve for the third with validation.
Missing side-
Substitution-
Method
Geometry formulas
Each result is calculated from the dimensions entered using standard Euclidean geometry formulas. The tool checks required constraints such as the triangle inequality and positive lengths.
Unless a unit is explicitly selected, lengths use any consistent unit, areas use its square, and volumes use its cube.
Questions
Pythagorean Theorem Calculator FAQ
What is the Pythagorean theorem?
For a right triangle, the squares of the two legs add to the square of the hypotenuse: a2 + b2 = c2.
Can the hypotenuse be shorter than a leg?
No. The hypotenuse is opposite the right angle and must be the longest side.
