Method
A rectangular area is length multiplied by width. The result is converted between square feet and square metres using a fixed unit relationship.
Utilities / browser tool
Square Footage Calculator
Get square feet and square metres from two simple dimensions.
Your inputs stay on your device
Calculate square footage
live resultft
ft
Square footage
Square metres
Perimeter
5.49 m
This models a simple rectangular area. It does not account for alcoves, waste, doors, windows, or irregular shapes; use the result as a planning estimate.
Useful context
How it works
Use the calculator first, then scan the details below when you want more context about the inputs, result, or assumptions.
How to use it
Choose feet or metres, enter the length and width of the rectangular space, and read the area and perimeter.
Understand the result
Square footage is the area inside the rectangle; perimeter is the distance around its edge.
Example
A 5 ft by 4 ft room contains 20 square feet and has a 18 ft perimeter.
Notes
This is a rectangular planning estimate and does not account for alcoves, irregular shapes, openings, waste, or material coverage.
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