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Results
Enter your dimensions above and the results appear here.
About the Parallelogram Calculator
The parallelogram calculator is a free online tool: area, perimeter, angles and diagonals. Enter base (b), slanted side (s) and height (h) 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.
Parallelogram Calculator example
Base (b) = 10 cm
Slanted side (s) = 6 cm
Height (h) = 5 cmArea = 50 cm²
Perimeter = 32 cm
Acute angle = 56.4427 °
Obtuse angle = 123.5573 °
Long diagonal = 14.2244 cm
Short diagonal = 8.3467 cmHow to use the Parallelogram Calculator
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter base (b), slanted side (s) and height (h). 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.
Parallelogram Calculator FAQ
What formulas does the parallelogram calculator use?
A = b × h; P = 2(b + s); θ = sin⁻¹(h / s); d = √(b² + s² ± 2bs·cos θ).
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 parallelogram 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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