Rectangle Calculator
Calculate the area, perimeter, and diagonal of a rectangle from its length and width.
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Area
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Perimeter
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Diagonal
Recent Calculations
What Is Rectangle?
A rectangle is a four-sided polygon with four right angles. Area measures the space inside, perimeter measures the distance around.
Formula
Area = length × width, Perimeter = 2(l + w), Diagonal = √(l² + w²)Example
A 10 × 6 rectangle has area = 60, perimeter = 32, and diagonal = 11.66.
Frequently Asked Questions
What's the difference between a rectangle and a square?
A square is a special rectangle where all four sides are equal.
How do I find the width from area and length?
Width = Area / Length.