Rhombus Calculator
Find the area, side length, perimeter, and angles of a rhombus from its two diagonals, which always cross at right angles.
Inputs explained
- Diagonal p — Length of one diagonal.
- Diagonal q — Length of the other diagonal.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: A rhombus with diagonals 6 and 8 has area 24, side length 5, and perimeter 20.
Frequently asked questions
Why do the two diagonals always meet at a right angle in a rhombus? It's a defining property of a rhombus that its diagonals bisect each other perpendicularly, which is also why the side length can be derived directly from the diagonals using the Pythagorean theorem (half of each diagonal forms a right triangle with the side).
How is this different from a general parallelogram calculator? A rhombus has all four sides equal, so it only needs the two diagonals as inputs; a general parallelogram needs a base, a different side length, and a height because its sides aren't equal.
Is the Rhombus Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Diagonal p, Diagonal q. Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Rhombus Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.