Rectangle Square Calculator
Compute area, perimeter, and diagonal for rectangles and squares from side lengths.
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Area, perimeter, and diagonal for rectangles and squares
Enter rectangle length and width or a single square side to compute area, perimeter, and diagonal length with the formulas shown for quick homework or layout checks.
For surface-area wording in 3D contexts, see the Surface Area of a Rectangle Calculator.
Frequently Asked Questions
Which diagonal formula is used?
Rectangles use √(l² + w²); squares use s√2.
Are units specified?
Inputs are unitless numbers; apply your own unit label to every result.
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