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Geometry Calculators

Geometry calculators for triangles, areas, perimeters and angles — each with the formula and a step-by-step solution.

1 calculator in this category

Triangle CalculatorEnter the three side lengths to find the area (via Heron’s formula), the perimeter, the semi-perimeter and the triangle type. The calculator also checks that the sides form a valid triangle.Open calculator→

About geometry calculators

Every calculator on CalcSolver runs entirely in your browser, so your numbers stay on your device and results appear instantly. Each tool shows the formula it uses and a clear, step-by-step solution, making it useful for checking homework, double-checking your own working, or learning a method for the first time.

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