How to use Rectangle Calculator
- Enter the length.
- Enter the width.
- Read the area, perimeter and diagonal.
About this tool
Area is length times width, perimeter is twice the sum of length and width, and the diagonal comes from the Pythagorean theorem: the square root of length squared plus width squared.
The calculator also reports whether the shape is a square.
Frequently Asked Questions
- How do I find the area in square feet?
- Enter both sides in feet. The result is in square feet.
- Is a square a rectangle?
- Yes, a square is a rectangle with equal sides.
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