Triangle Calculator
Solve any triangle from any 3 valid measurements — sides, angles, or a mix — and instantly see all missing sides, angles, area, and perimeter.
Inputs
Enter any 3 values (must include at least one side). Leave others blank or 0.
Results
About the Triangle Calculator
Given any combination of three values that defines a unique triangle (SSS, SAS, ASA, or AAS), this calculator returns every remaining measurement using the Law of Sines and Law of Cosines.
Heron's formula computes the area from the three sides. The perimeter is simply the sum of the sides.
Frequently asked questions
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