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.