Rectangle Perimeter Calculator
Calculate the perimeter and diagonal of a rectangle from its length and width.
Enter length and width.
Rectangle Perimeter Formula
Perimeter = 2(length + width)
Diagonal = √(length² + width²)
Diagonal = √(length² + width²)
Example: l = 12, w = 8
P = 2(12 + 8) = 40 | Diagonal = √(144 + 64) = 14.42
P = 2(12 + 8) = 40 | Diagonal = √(144 + 64) = 14.42
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Last updated: 2026-08-08