Geometry

Heron's Formula Calculator

Triangle area from three side lengths.

Area

Semiperimeter s

This free Heron's Formula Calculator covers Triangle area from three side lengths.

s is the semiperimeter; area is √[s(s−a)(s−b)(s−c)]. Other geometry tools are linked below.

Heron's Formula Calculator — how it works

Triangle area from three side lengths. Typical inputs are a, b and c. How it works beside the form states the identity the Heron's Formula Calculator applies.

FAQ

How do I use the Heron's Formula Calculator?

Open the Heron's Formula Calculator, fill a, b and c, and read the result. s is the semiperimeter; area is √[s(s−a)(s−b)(s−c)].

What formula does the Heron's Formula Calculator use?

The Heron's Formula Calculator uses the identity in How it works. In words: s is the semiperimeter; area is √[s(s−a)(s−b)(s−c)].

More tools in Geometry and popular picks.