What is the formula for the area of a rhombus using diagonals?

Area = (d1 × d2) / 2, where d1 and d2 are the lengths of the two diagonals. The diagonals of a rhombus bisect each other at right angles, which is why this formula works.

What is the formula using base and height?

Area = base × height, where the height is the perpendicular distance between two opposite sides (not the slant side length).

Does it matter which diagonal I call d1 and which d2?

No. Because multiplication is commutative, d1 × d2 = d2 × d1, so you can assign the labels in either order.

Can I use different units for each input?

No — both inputs must use the same unit. The result will be in the square of that unit (e.g., cm gives cm²).

Is a square a special case of a rhombus?

Yes. A square is a rhombus with equal diagonals (d1 = d2) and right angles at every vertex. The area formulas apply equally.

How is a rhombus different from a parallelogram?

A rhombus is a parallelogram with all four sides equal in length. Every rhombus is a parallelogram, but not every parallelogram is a rhombus.

Area of a Rhombus Calculator

Name: Area of a Rhombus Calculator
Availability: InStock
Author: Nham Vu

Enter the diagonals or base and height of a rhombus to instantly calculate its area with the formula and working shown.

Calculator Inputs

Diagonal 1 (d₁)

Diagonal 2 (d₂)

Unit

Area

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Enter values and click Calculate

Rhombus diagram

Diagonals bisect each other at right angles

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Summary