Triangle Area Calculator
Area from base and height.
Enter your values in the interactive calculator to see an instant result. Calculations run in your browser, without an account.
Results are estimates for educational use; confirm important decisions with appropriate experts.
Formula • Worked example • Interpretation
Area of a triangle from base and height
The area of a triangle is half the area of a rectangle with the same base and perpendicular height.
Calculation method
Worked example
A triangle with a 10 cm base and 6 cm perpendicular height has an area of 30 cm².
What your result means
The height is measured at 90 degrees from the chosen base to the opposite vertex or its line, not along a sloping side.
Tips for better calculations
Use matching units for both dimensions; otherwise convert before multiplying.
Assumptions and limitations
The formula uses two consistent length units and a nonnegative base and height. If only three side lengths are known, use Heron’s formula instead.
SiCalcs tools provide estimates and educational calculations; they do not replace professional financial, medical, tax, or legal advice.