Rectangle Area and Perimeter Calculator
Calculate rectangle area and perimeter from length and width. Example: 5 by 3 → area 15, perimeter 16. Copy result.
A rectangle has two pairs of equal sides. Area = length × width. Perimeter = 2 × (length + width). Enter the length and width in any length unit. The calculator gives area (in square units) and perimeter (in the same unit). Copy the result or Copy with labels.
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Examples
- length 5, width 3 → area 15, perimeter 16
- length 10, width 10 → area 100, perimeter 40 (square)
- length 4, width 7 → area 28, perimeter 22
FAQ
How do I find the area of a rectangle?
Area = length × width (or base × height).
How do I find the perimeter of a rectangle?
Perimeter = 2 × (length + width).
What units can I use?
Any length unit (meters, feet). Area is in square units (m², ft²). Perimeter is in the same unit as the sides.
Does it work for squares?
Yes. A square is a rectangle with length = width. Enter the same value for both.
What if length or width is zero?
Both must be positive for a valid rectangle. Otherwise area and perimeter are zero or undefined.