How to use this calculator
Calculate triangle area from base and height, or from three side lengths using Heron's formula.
How the calculation works
- Choose base-height or side-length mode.
- Enter the required measurements.
- The area is calculated after validation.
Formula
Base-height area = base x height / 2. Heron's formula: sqrt(s(s-a)(s-b)(s-c)).
Example
A triangle with base 10 and height 6 has area 30.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- Heron's formula requires side lengths that form a valid triangle.
- Units are generic; area uses squared units.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.