Heron's Triangle Area Calculator

Enter the three side lengths of a triangle to find its area using Heron's formula. The semi-perimeter and each step are shown.

Side a

Side b

Side c

Area

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How it works

s = (a + b + c) / 2, Area = √(s(s-a)(s-b)(s-c)).

Frequently Asked Questions

What if it is not a valid triangle?

If the longest side is not shorter than the sum of the other two, no triangle exists and the calculator will say so.