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
Calculate the area and perimeter of a rectangular room or space.
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.
Context & Reference
How it works
Calculators are most useful when their assumptions are clear. Review these details to better understand the logic behind the results.
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.
Useful next steps
Related tools
Continue with a closely related task, calculation, conversion, or local text tool.
Area Converter
Convert between metric and imperial area units instantly.
Concrete Calculator
Estimate concrete volume from length, width, and depth.
Paint Calculator
Estimate paint litres from surface area, coats, and coverage.
Tip Calculator & Bill Split
Free tip calculator to work out the tip and split a bill across any number of people.
Recipe Scaler
Scale a recipe up or down by changing the number of servings.
Area Calculator
Free area calculator to calculate the area of a rectangle, circle, or triangle from dimensions.