Triangle Area Calculator
Triangle area calculator: area from base and height, or the base or height from the area.
A = b · h2
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
The area of any triangle is half the base times the perpendicular height: A = b·h/2.
The height must be measured at a right angle to the base. If you only know the three sides, use the Heron calculator.
Formula
A = b · h2
| Symbol | Quantity | Units |
|---|---|---|
| b | Base | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| h | Height | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| A | Area | m², km², cm², mm², ha, ft², in², yd², ac, mi² |
Worked example
Given: b = 8 cm · h = 5 cm
A = b · h2
Result: A = 20 cm²
Frequently asked questions
What is the area of a triangle with base 8 cm and height 5 cm?
8 × 5 ÷ 2 = 20 cm².