A triangle calculator works out side lengths, angles, area and perimeter. The area of any triangle is ½ × base × height.
A triangle calculator works out side lengths, angles, area and perimeter. The area of any triangle is ½ × base × height. Our triangle calculator is built on the same core area of triangle calculator triangle side calculator triangle angles calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
Heron's Formula for Triangle Area
When three sides (a, b, c) are known, area = √[s(s−a)(s−b)(s−c)], where s = (a+b+c)/2 is the semi-perimeter.
Law of Sines and Law of Cosines
Our tool calculates all internal angles and verifies triangle inequality (sum of any two sides must exceed the third).
Types of Triangles
Classifies triangles into Equilateral (all equal sides), Isosceles (two equal sides), Scalene (all unequal), and Right-angled triangles.
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