Triangle Solver
Solve sides, angles, area and perimeter from exactly three known values.
A QUICK WALKTHROUGH
How to use this tool
- Enter exactly three values, including at least one side. Leave other fields empty.
- Use one length unit; A, B and C are opposite a, b and c. Angles are degrees.
- Calculate
Triangle Solver
SSS, SAS, ASA, AAS and SSA are supported; SSA can yield two triangles. Law of cosines and sines determine missing values; Heron’s formula gives area. Results use 12 significant digits and browser floating-point arithmetic. Sides must be 1e−100 to 1e100; nearly degenerate triangles are rejected. All calculations stay in this browser.
GOOD TO KNOW
Common questions
Triangle Solver?
SSS, SAS, ASA, AAS and SSA are supported; SSA can yield two triangles.