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Heron's Formula Triangle Area Calculator

This calculator requires the use of Javascript enabled and capable browsers. This script calculates the area of a triangle, based on the formula attributes to the Greek mathematician Heron. This calculation is often termed as the irregular triangle calculations method. The formula is based on all three sides of the triangle. Assuming you know all three lengths, a, b, and c. The semi-perimeter (1/2 of the perimeter) of the triangle is s. Knowing that, you may determine the area based on these calculations:

s = (a + b + c) / 2 or 1/2 of the perimeter of the triangle

A = SquareRoot(s * (s - a) * (s - b) * (s - c))

Enter the length of all three sides. What the unit of measurement is exactly is not important. Click on Calculate and the values for both "s" and the area are returned. You may see all of our other area calculations by going to our Area Calculator.

Required Data Entry
Side A Length Units
Side B Length Units
Side C Length Units

Calculated Results
Area of Triangle
Value of S = (A+B+C)/2
Updated 8.12.11

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