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Results
Enter your dimensions above and the results appear here.
About the Rhombus Calculator
The rhombus calculator is a free online tool: area, side, perimeter and angles from diagonals. Enter diagonal 1 (d₁) and diagonal 2 (d₂) and the results update instantly, alongside a labelled diagram so you always know which measurement goes where.
Choose your input unit (mm, cm, m, km, in, ft or yd) and optionally show the results in a different one: lengths, areas and volumes are converted correctly. Every answer shows the formula behind it, and the calculation runs in your browser, so nothing is uploaded.
Rhombus Calculator example
Diagonal 1 (d₁) = 12 cm
Diagonal 2 (d₂) = 8 cmArea = 48 cm²
Side length = 7.2111 cm
Perimeter = 28.8444 cm
Acute angle = 67.3801 °
Obtuse angle = 112.6199 °
Inscribed circle radius = 3.3282 cmHow to use the Rhombus Calculator
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter diagonal 1 (d₁) and diagonal 2 (d₂). Focus a field to highlight the matching label on the diagram.
- Read the results as you type. The largest card is the main answer; the others are the related measurements.
- Copy a single value, copy everything, or share a link that keeps your inputs.
Rhombus Calculator FAQ
What formulas does the rhombus calculator use?
A = ½ d₁ d₂; a = ½√(d₁² + d₂²); P = 4a; r = A / 2a.
Can I use different units?
Yes. Pick the input unit and, if you like, a different output unit. Area results are shown in squared units and volumes in cubed units.
Is this rhombus calculator free and private?
Yes. It is free with no sign-up, and calculations happen on your device, so your numbers are never sent to a server.
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