Triangle Calculator

Area by base-height or Heron, plus perimeter.

Input Parameters

Calculation Mode

Base

Height

Area30

Perimeter—

Calculation ModeBase × Height

175 available

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Triangle area by base × height ÷ 2 or Heron’s formula from three sides, plus perimeter.

Heron’s formula?

Area = √(s(s−a)(s−b)(s−c)) with s the semiperimeter.

Invalid triangle?

Sides must satisfy all three triangle inequalities.

Right triangle?

Use base and height as legs, or the dedicated Pythagoras tool.