Rhombus Calculator

Compute the area, perimeter, diagonals and angles of a rhombus — a parallelogram with four equal sides. Enter the side length plus one angle, or both diagonals, and the calculator derives the rest.

Enter rhombus details

Any acute or obtuse interior angle (0° < θ < 180°).

Enter side length and angle, or both diagonals.

Rhombus formulas

Perimeter: P = 4s

Area: A = s² · sin(θ) = (d₁ · d₂) / 2

Diagonals: d₁ = 2s · cos(θ/2)

d₂ = 2s · sin(θ/2)

Parallelogram Calculator

Parallelogram area and diagonals.

Square Calculator

Square area, perimeter and diagonal.

Frequently asked questions

No. Every square is a rhombus, but a rhombus is only a square when all four angles are 90°. A general rhombus has equal sides but slanted angles.

Yes — in every rhombus, the two diagonals are perpendicular and bisect each other. This is a distinguishing property of the rhombus.