About the Triangle Area Calculator
Area of a triangle from base and height, two sides and the included angle, or three sides — pick whichever you know.
Also known as: area of a triangle, triangle area formula, half base times height.
How to use this calculator
- Enter known values and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
½·b·h · ½·a·b·sin C · √(s(s−a)(s−b)(s−c))
Worked example
Using the values pre-filled in the calculator above:
- Known values: Base & height
- Base = 10
- Height = 6
the calculator returns:
- Area: 30 sq units