Rectangle Calculator (area, perimeter)
From length and width, get a rectangle's area, perimeter and diagonal.
Result
Area
40.0000
Perimeter
28.0000
Diagonal
10.7703
How it works
Area = L·W · Perimeter = 2·(L+W)
Enter length and width. The tool returns the area (L×W), the perimeter (2·(L+W)) and the diagonal (√(L²+W²)).
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Frequently asked questions
How do I find a rectangle's area?
Multiply length by width: area = L × W.
How is the diagonal found?
By the Pythagorean theorem: diagonal = √(length² + width²).
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