Triangle Calculator
Heron’s formula calculates area from the semiperimeter and three sides.
This calculator is free to use. Enable JavaScript to enter your values and see a result instantly.
How it works
Heron’s formula calculates area from the semiperimeter and three sides.
Worked example
A 3–4–5 triangle has area 6.
Keep in mind
Results are estimates; check the assumptions for your situation.