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Rectangle calculator
Calculate area, perimeter and diagonal from width and height. Use it in your browser, with no account required.
No account needed
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How to use
- 1Enter your values and choose the options.
- 2Run the tool and review the result.
- 3Copy the result or save it as a file.
Good to know
Use the same unit for all lengths. Areas use square units and volumes use cubic units.
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Worked input and output example
These results come from this tool’s actual engine using the sample values below, not your personal input or saved work. Load the example in the tool to inspect the same inputs.
Example input
| Field | Value |
|---|---|
| Width | 8 |
| Height | 5 |
Example result
- Area
- 40
- Perimeter
- 26
- Diagonal
- 9.43398113206
Input constraints
These are the actual input validation limits; they are not a guarantee that every accepted value is realistic or that a model applies to your situation.
- Width: Accepted range: 0.000000001 ≤ x ≤ 1,000,000,000,000
- Height: Accepted range: 0.000000001 ≤ x ≤ 1,000,000,000,000