Rhombus Area Calculator
Area from diagonals, side and angle, or base and height.
Enter your values
Enter the diagonal 1 in units.
Enter the diagonal 2 in units.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Area
- 120 sq units
- Side length
- 13
- Perimeter
- 52
- Height
- 9.2308
- Acute angle
- 45.24°
- Obtuse angle
- 134.76°
Quick answer
A rhombus's area is half the product of its diagonals: A = (d₁ × d₂) ÷ 2, because the diagonals cut it into four right triangles.
A = (d₁ · d₂) ÷ 2
At a glance
| What it does | Area from diagonals, side and angle, or base and height. |
|---|---|
| Category | Math |
| Inputs needed | Diagonal 1, Diagonal 2 |
| Main output | Area |
| Formula | A = (d₁ · d₂) ÷ 2 |
| Cost | Free — no sign-up, no download |
How to use the Rhombus Area Calculator
- 1Measure both diagonals corner to corner.
- 2Enter them in any order.
- 3Read the area plus the side length you will need for ordering trim or edging.
Inputs explained
- Diagonal 1(units)
- Enter the diagonal 1 in units.
- Diagonal 2(units)
- Enter the diagonal 2 in units.
Worked example
Using the values the calculator loads with:
Inputs
- Diagonal 110 units
- Diagonal 224 units
Results
- Area120 sq units
- Side length13
- Perimeter52
- Height9.2308
- Acute angle45.24°
- Obtuse angle134.76°
Frequently asked questions
Is a square a rhombus?
Yes — a square is a rhombus whose angles all happen to be 90°, so its diagonals are equal.
Do the diagonals always cross at right angles?
In a rhombus, yes, and they bisect each other, which is exactly why the area formula works.
What do I need to enter into the Rhombus Area Calculator?
Just 2 values: diagonal 1, diagonal 2. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Rhombus Area Calculator work out the answer?
A rhombus's area is half the product of its diagonals: A = (d₁ × d₂) ÷ 2, because the diagonals cut it into four right triangles. It applies the formula A = (d₁ · d₂) ÷ 2 and shows the working so you can check each step by hand.
Is the Rhombus Area Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.