Calculators

Right Triangle Calculator

Solve sides, area & angles (Pythagoras).

Enter any three values including at least one side (sides a, b, c; angles A, B, C where A is opposite a). Works for SSS, SAS, ASA, AAS and SSA. Leave the rest blank.

Side aSide bSide cAngle A (°)Angle B (°)Angle C (°)

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Area

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Perimeter

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Inradius

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Circumradius

This free triangle calculator solves any triangle — not just right triangles — from any three values that include at least one side. It handles all the standard cases (SSS, SAS, ASA, AAS and the ambiguous SSA) using the law of sines and law of cosines, and returns all three sides, all three angles, the area, perimeter, inradius and circumradius, along with a scaled diagram. Switch between degrees and radians for angle input and output.