Triangle Calculator

Calculate area, perimeter, angles, and sides of any triangle. Supports equilateral, isosceles, scalene, and right triangle types.

📐 Enter Known Values

Provide any 3 values (at least one side) to solve the triangle.

📊 Triangle Properties

Enter 3 values (including at least one side) and click calculate to see the results.

Solve Any Triangle

Whether you know three sides (SSS), two sides and an angle (SAS), or two angles and a side (ASA/AAS), our calculator will instantly find the remaining measurements.

Detailed Properties

Automatically calculates the area, perimeter, and semi-perimeter of the triangle. It also classifies your triangle as equilateral, isosceles, right, acute, or obtuse.