What is the fastest way to find rhombus area?

If both diagonals are known, multiply them and divide by two.

Is every rhombus a parallelogram?

Yes. A rhombus is a parallelogram with all four sides equal, so base times height also works.

Can a rhombus have height equal to its side?

Yes. That boundary case is a square, and the calculator treats it as valid.

Rhombus Area Calculator

Calculate rhombus area from diagonals, side and height, side and angle, or side and one diagonal, with perimeter, height, angles, diagonals, and inradius.

Known values

Unit

First diagonal (m)

Second diagonal (m)

Enter both diagonals. In a rhombus, they are perpendicular and bisect each other.

Changing the unit converts length fields; angle stays in degrees.

In side-and-diagonal mode, enter either diagonal; the other one is recovered.

Height equal to the side is the square boundary case.

The angle can be acute or obtuse.

Rhombus area by diagonals, height, or angle

English competitors usually treat this as a small rhombus solver, not only a diagonal formula page. This calculator accepts diagonals, side and height, side and angle, or side with one diagonal, then returns area and related measurements.

A = \frac{d _{1} d _{2}}{2}

A is area; d_1 and d_2 are the rhombus diagonals.

A = ah

a is side length; h is perpendicular height.

A = a^{2} sin θ

theta is any interior angle of the rhombus.

Inputs and validation

Known values	What is calculated
Two diagonals	Side, height, area, perimeter, angles, and inradius.
Side and height	Area plus angles and diagonals when the height is not greater than the side.
Side and angle	Area, height, perimeter, diagonals, and inradius.
Side and one diagonal	The missing diagonal, then the full result set.

A single side length does not determine a rhombus area. You need height, an angle, a diagonal, or both diagonals.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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