About this Triangle Area Calculator
Triangle Area Calculator provides the standard base-and-height area calculation for triangles when a perpendicular height is known.
Formula or method
Area = (base × height) ÷ 2.
Example
A base of 10 and height of 6 gives an area of 30 square units.
Common uses
- Check basic geometry problems.
- Estimate triangular surface area.
- Verify manual base-height calculations.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
The height must be perpendicular to the selected base.
Frequently asked questions
Can I use a slanted side as the height?
Only if that measurement is perpendicular to the chosen base.
What units are returned?
The result is in square units corresponding to the units used for base and height.