Rhombus Calculator
Calculate area, perimeter and angles of a rhombus from its side and diagonals.
About Rhombus Calculator
A rhombus has four equal sides with diagonals that bisect each other at right angles. Area = ½ × d₁ × d₂. Each side = √((d₁/2)² + (d₂/2)²).
Formulas
Area
A = (d₁ × d₂) / 2
- d₁
- First diagonal
- d₂
- Second diagonal
Side
s = √((d₁/2)² + (d₂/2)²)
- d₁
- First diagonal
- d₂
- Second diagonal
Worked example
With the default values below, Rhombus Calculator returns Area of 48.0000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Diagonal 1 (p)minimum 0 units
- 12 units
- Diagonal 2 (q)minimum 0 units
- 8 units
Results
- Area
- 48.0000 sq units
- Perimeter
- 28.8444 units
- Side Length
- 7.2111 units
- Acute Angle
- 67.3801 °
- Obtuse Angle
- 112.6199 °
Step by step
- 1Area from diagonals= 48
- 2Side length= 7.2111
- 3Perimeter= 28.8444
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
Is a square a special rhombus?
Yes — a square is a rhombus where both diagonals are equal.
Do the diagonals of a rhombus bisect the angles?
Yes — each diagonal bisects a pair of opposite vertex angles.