Square Footage Calculator
Calculate the square footage of a room or area from its length and width, add multiple rooms, and get the total in square feet and metres.
Last reviewed by the Radiatus Cloud team
Calculate the square footage of a room or area from length and width.
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Calculate square footage
Square footage is the area of a space, found by multiplying its length by its width when both are measured in feet. This calculator computes it for a rectangular room or area, and lets you multiply by the number of identical rooms to total them. It also converts the result to square metres and square yards. A room twelve feet by ten feet is one hundred twenty square feet.
Square footage is the standard measure for flooring, paint, real estate listings and many home-improvement materials.
Measuring areas for projects
Knowing the square footage of a space is the first step in estimating materials and costs for flooring, carpet, tile, paint and more, and it is the figure real estate uses to describe property size. For rectangular rooms the calculation is simply length times width; for irregular spaces, divide the area into rectangles, calculate each, and add them together.
Always measure at the widest points and allow a little extra when ordering materials to account for cuts and waste. The conversions to metric and square yards help when materials are sold in those units. All calculation happens locally in your browser.
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Frequently Asked Questions
How do I calculate square footage?
Multiply the length by the width when both are in feet. A room twelve feet by ten feet is one hundred twenty square feet.
How do I handle an irregular room?
Divide it into rectangles, calculate the square footage of each, and add them together to get the total area.
Can it total several rooms?
Yes. Enter the number of identical rooms and the tool multiplies the area, and it also shows the figure per room.
Why convert to square metres?
Many materials and plans use metric units, so the square-metre and square-yard conversions help when ordering in those systems.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Enter length and width in feet; add more rooms as needed.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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