Parallelogram Area Calculator
Parallelogram area calculator determines the area for an arbitrary parallelogram using three parallelogram area formulas.
The formula
A = base × height, P = 2(a + b)
Height, not side length
The area uses the perpendicular height, not the slanted side. Shearing a rectangle into a parallelogram leaves the area unchanged while the sides get longer — which is exactly why using the side would overstate it.
Area scales with the square
Double every length in a flat shape and the area quadruples; triple them and it grows ninefold. Perimeter, being a length, scales in step with the sides. That mismatch is why bigger shapes enclose proportionally more area per unit of edge — and why a circle, having no corners at all, encloses the most area for a given perimeter of any shape.
Units
Whatever unit you enter, the area comes out in that unit squared and the perimeter in the unit itself. The calculator is unit-agnostic — enter centimetres and read cm and cm², or feet and read ft and ft². Just do not mix units between fields.