How do you find the area of a rhombus from its diagonals?

Area = (p × q) ÷ 2, where p and q are the two diagonals. The diagonals of a rhombus always cross at right angles.

How do you find the side of a rhombus from its diagonals?

Each side = √((p/2)² + (q/2)²), because the half-diagonals form the legs of a right triangle whose hypotenuse is the side.

Does this tool upload anything?

No — all maths happens in your browser and no data is sent anywhere.

Rhombus Calculator

Area, perimeter, diagonals and angles of a rhombus.

Rhombus calculator

A rhombus has four equal sides. This tool solves it three ways: from both diagonals, from a side and height, or from a side and an interior angle.

From the diagonals, the area is (p × q) ÷ 2 and each side is √((p/2)² + (q/2)²). From a side and angle θ, the area is side² × sin θ. All calculations stay in your browser.