Triangle Area Calculator

The area of any triangle is base times height divided by two (A = b×h/2). The height must be measured perpendicular to the chosen base — not along a slanted side. A triangle with an 8 m base and 5 m height covers 20 m².

This works for every triangle: right, isosceles or scalene. It is the go-to formula for gable walls, triangular garden plots and roof sections. For four-sided shapes, see the rectangle and trapezoid area calculators.