Parallelogram Calculator

Compute the area, perimeter and diagonals of a parallelogram. Enter the base and height (for area), or the base, side and included angle (for all properties). The calculator reports whatever is determined by the inputs.

Enter parallelogram details

If omitted, provide the included angle instead.
Angle between the base and the side (0° < θ < 180°).

Enter base, side, and height or angle.

Parallelogram formulas

Area: A = b · h = b · a · sin(θ)

Perimeter: P = 2 · (a + b)

Height: h = a · sin(θ)

Diagonals: d₁ = √(a² + b² + 2ab·cos θ)

d₂ = √(a² + b² − 2ab·cos θ)

Rectangle Calculator

Area, perimeter and diagonal.

Rhombus Calculator

Rhombus with equal sides.

Trapezoid Calculator

Trapezoid area and perimeter.

Frequently asked questions

A rectangle is a parallelogram with right angles. All rectangles are parallelograms, but not all parallelograms are rectangles. Opposite sides are parallel and equal in both shapes.

Yes. In every parallelogram, the diagonals bisect each other (they cross at their midpoints). This is one of the defining properties of a parallelogram.