Calculate area and perimeter for 9 shapes — rectangle, square, circle, triangle, trapezoid, parallelogram, ellipse, sector, and rhombus
This free area calculator handles nine common geometric shapes — rectangle, square, circle, triangle, trapezoid, parallelogram, ellipse, circular sector, and rhombus. Pick a shape, type the dimensions, and you get both the area and the perimeter (where applicable) in real time, along with the formula and calculation breakdown so you can follow every step.