Rhombus area calculator

Calculate rhombus area from its two diagonals using A = D × d ÷ 2. Enter their lengths in matching units and check the result, formula and example.

Result

Four triangles, one area

Each triangle has legs half as long as the diagonals. Pythagoras gives the rhombus’s side; four sides make its perimeter.

How do you calculate rhombus area?

Multiply the perpendicular diagonals and divide by two. A rhombus’s diagonals bisect each other and split the shape into four right triangles.

A = \frac{D \times d}{2}

How to use the calculator

Enter measurements with a decimal point or comma: results update immediately. Input units apply to every length; changing them converts the measurements. Changing result units leaves the shape unchanged. The control below the drawing reveals or hides its visual explanation. Copy results includes valid measurements and the result. Reset and Try this example restore the initial values and centimetre units.

The first formula shows the relationship; the second substitutes measurements converted to the result unit. The ≈ sign indicates rounding, including in the substituted values.

A rhombus decoration

A decoration with diagonals 8 and 6 cm covers 24 cm². The half-diagonals are 4 and 3 cm, giving a side of 5 cm and a perimeter of 20 cm.

From measurements to the result

Input: $D = 8 cm; d = 6 cm$
Result: $24 {cm}^{2}$

Calculation steps

Multiply the two diagonals.
$D \times d = 8 \times 6 = 48$
Complete the calculation using the tool’s formula.
$A = \frac{48}{2} = 24$

Units and interpretation

Area uses square units: 1 m² = 10,000 cm².

This formula describes a rhombus. Two arbitrary diagonals do not specify a general quadrilateral.

Precision and numerical limits

Lengths range from 0 to 10¹² in the selected unit; triangle sides must be strictly positive. Results use two decimal places, with scientific notation for very small or large values. Calculations use browser precision: unrepresentable positive values produce an error. A rejected unit change keeps the previous data. Calculation takes place in your browser.

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Rhombus area calculator

Result

Four triangles, one area

How do you calculate rhombus area?

How to use the calculator

A rhombus decoration

From measurements to the result

Calculation steps

Units and interpretation

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