Rectangle Area & Perimeter Calculator
Rectangle Area & Perimeter Calculator
The rectangle calculator computes both the area and perimeter of a rectangle, two of the most commonly needed geometric measurements.
Conversion Formula
Area = length × width gives the enclosed space. Perimeter = 2 × (length + width) gives the total edge length.
Step-by-Step Examples
Length: 8, Width: 5 = Area: 40, Perimeter: 26
8 × 5 = 40; 2(8+5) = 26.
Length: 12, Width: 12 = Area: 144, Perimeter: 48
A square: 12 × 12 = 144; 2(12+12) = 48.
Frequently Asked Questions
How do I calculate the area of a rectangle?
Multiply the length by the width: A = l × w.
How do I calculate the perimeter of a rectangle?
Add all four sides: P = 2(l + w).
What is the difference between area and perimeter?
Area measures the space inside the rectangle (in square units), while perimeter measures the total distance around it (in linear units).
Is a square a rectangle?
Yes. A square is a special rectangle where all four sides are equal.
What units should I use?
Any consistent units. Area will be in square units (e.g., ft²) and perimeter in linear units (e.g., ft).