Triangle Area Calculator
Calculate triangle area with Calculator 360 using the available inputs.
Try an example
These calculators may also help
How to use this calculator
With base b and perpendicular height h, area is b × h ÷ 2. Other methods use three sides, two sides and the included angle, or vertex coordinates.
Use consistent length units. Three side lengths must satisfy the triangle inequality.
Frequently asked questions
Which method works with three sides?
Use Heron’s formula after checking that the sides form a triangle.
Are negative coordinates accepted?
Yes. The coordinate method returns a nonnegative area.