Rectangle Area and Perimeter Calculator

Q: "How do I find the area of a rectangle?"

"Area = length × width (or base × height)."

Q: "How do I find the perimeter of a rectangle?"

"Perimeter = 2 × (length + width)."

Q: "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."

Q: "Does it work for squares?"

"Yes. A square is a rectangle with length = width. Enter the same value for both."

Q: "What if length or width is zero?"

"Both must be positive for a valid rectangle. Otherwise area and perimeter are zero or undefined."

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.