๐Law of Sines Calculator
Solve oblique triangles using a/sin A = b/sin B = c/sin C, including full handling of the SSA ambiguous case.
Free Law of Sines Calculator
Solve oblique triangles instantly with our free Law of Sines Calculator, using the relationship a/sin A = b/sin B = c/sin C. It handles ASA, AAS, and the trickier SSA case, computing every missing side and angle with full step-by-step working shown.
The SSA case is famous for producing zero, one, or two valid triangles depending on your numbers โ this calculator detects which situation applies automatically, and when two triangles are possible, shows both solutions clearly labelled, along with an explanation of why. Impossible SSA inputs are flagged with a plain-English reason rather than a broken calculation.
Area and perimeter are computed for each valid solution, and a scaled diagram accompanies the result. No sign-up, no downloads. See the About page or the FAQ for more.