Rectangle Perimeter
Math CalculatorsFind the perimeter of a rectangle or square.
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Perimeter (P)
About This Tool
Quickly calculate the total boundary length of a rectangle. Enter the length and width to find the perimeter using the standard formula.
Frequently Asked Questions
The perimeter of a rectangle is found by adding all four sides together: $P = 2(L + W)$, where $L$ is length and $W$ is width.
Yes! A square is a special rectangle where the length and width are equal. Simply enter the same value for both fields.
You can find the other side by dividing area by the known side, then use both values in the perimeter formula $2(L+W)$.
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