FREE ONLINE TOOL
Area calculator.
Find the area and perimeter of a rectangular room, floor, wall, or surface.
YOUR INPUTS
Results update instantly as you type. No account required.
YOUR RESULT
120 ft²Rectangular surface area
Length12 ft
Width10 ft
Perimeter44 ft
How is this calculated?
Area = length × width. Perimeter = 2 × (length + width).
Example
A room 12 feet long and 10 feet wide has an area of 120 square feet and a perimeter of 44 feet.
Important to know
Both dimensions must use the same unit. This calculator assumes a perfect rectangle and does not include material waste or irregular cutouts.