Rectangle Area Calculator
Area and perimeter from dimensions.
Rectangle area
40m²
Perimeter
26m
Optional: sends these inputs and this result to AI. Avoid confidential or sensitive information.
About Rectangle Area Calculator
A rectangle's area is length multiplied by width. Its perimeter is twice the sum of the two dimensions. Meter inputs produce square meters for area and meters for perimeter.
Important considerations
Applies only to rectangles with perpendicular sides. It does not account for cutouts, waste allowances, or irregular shapes. Check measurements before ordering materials.
Want to understand the math?
Read our plain-language guide: How to Calculate Rectangle Area and Perimeter