Just enter the diagonals of the rhombus below and click Calculate Area. Use a period or comma as the decimal separator.
Rhombus Area Calculator
Answer:
How to use the calculator
- Enter the Major Diagonal (D) of the rhombus.
- Enter the Minor Diagonal (d) of the rhombus.
- Select the unit of measurement.
- Click Calculate Area to see the result.
Formula for the area of a rhombus
The area of a rhombus is calculated as the product of the diagonals divided by 2:
A = (D × d) ÷ 2
Where D is the major diagonal and d is the minor diagonal. The diagonals of a rhombus are perpendicular to each other, which allows it to be decomposed into 4 equal right triangles.
Practical examples
| Major Diagonal (D) | Minor Diagonal (d) | Area (A = D × d ÷ 2) |
|---|---|---|
| 10 cm | 6 cm | 30 cm² |
| 8 m | 5 m | 20 m² |
| 12 cm | 9 cm | 54 cm² |
| 7.5 m | 4 m | 15 m² |
| 20 mm | 14 mm | 140 mm² |
Frequently asked questions
What is the formula for the area of a rhombus?
The area is A = (D × d) ÷ 2, where D is the major diagonal and d is the minor diagonal. Example: D = 10 cm and d = 6 cm → A = 30 cm².
Why does the area formula use the diagonals and not the side?
The diagonals of a rhombus are perpendicular and bisect each other. This allows the area to be calculated as half the product of the diagonals, without needing the height.
Is a square a rhombus?
Yes. A square is a rhombus with 4 right angles (90°). Its diagonals are equal (D = d = L√2) and the formula gives A = L², confirming the square's area.
Can I use a comma instead of a decimal point?
Yes. This calculator accepts both comma and period as the decimal separator.
See also…
