Area Calculator
Calculate the area of a rectangle, triangle, circle, trapezoid, or parallelogram. Pick a shape, enter the dimensions, and see the area and the formula.
Area
50 unitsΒ²
length Γ width = 10 Γ 5
Rectangle: l Γ w Β· Triangle: Β½ Γ b Γ h Β· Circle: Ο Γ rΒ² Β· Trapezoid: Β½ Γ (a + b) Γ h Β· Parallelogram: b Γ h. The result is in square units of whatever unit you entered.
Frequently Asked Questions
How do I find the area of a circle?
Multiply pi by the square of the radius: area = Ο Γ rΒ². For a circle with radius 5, the area is Ο Γ 25 β 78.54 square units. Select 'Circle' above and enter the radius.
How do I calculate the area of a triangle?
Multiply the base by the height and divide by two: area = Β½ Γ base Γ height. The height must be the perpendicular distance from the base to the opposite vertex, not the length of a slanted side.
What is the formula for the area of a trapezoid?
Average the two parallel sides and multiply by the height: area = Β½ Γ (a + b) Γ height, where a and b are the lengths of the parallel sides. The height is the perpendicular distance between them.
How do I find the area of a parallelogram?
Multiply the base by the perpendicular height: area = base Γ height. Note this uses the vertical height, not the length of the slanted side.
What units does the area come out in?
Area is always in square units of whatever unit you enter. If you measure in feet, the area is in square feet; if you measure in meters, it's in square meters. Just keep all measurements in the same unit.