ROOMS, MATERIALS, AND ORDER QUANTITIES
Square Footage Calculator
Calculate square footage for a rectangular room, floor, wall, or repeated section using U.S. feet-based dimensions.
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Enter your values and select Calculate. Your result stays on this device.
How it works
Total square feet = length in feet × width in feet × matching sections.
Assumptions
Every section is rectangular and uses the same dimensions. Irregular rooms should be split into separate rectangles and added.
About this calculator
Square footage is a high-intent U.S. project search. This calculator focuses on the room-sized task and lets you multiply identical sections without mixing square-foot conversion into the measurement step.
How to use it
- Measure length and width in feet.
- Use decimal feet or convert inches before entering a mixed measurement.
- Enter how many identical rectangular sections are included.
- Calculate total square feet, then add a material allowance only in the relevant project tool.
Use case
square footage calculator: a clear planning check
Multiply length by width and repeated sections to calculate net square footage, with square yards shown for comparison.
Measure a rectangular room, wall, floor, or repeated section in square feet before planning materials.
Source and update
Last reviewed: 2026-08-22
NIST Guide for the Use of the International System of UnitsFrequently asked questions
How do I calculate room square footage?
For a rectangular room, multiply its length in feet by its width in feet.
How do I measure an L-shaped room?
Split it into rectangles, calculate each area separately, and add the results.
Should I add waste to square footage?
Measure net area here. Add a project-specific cutting or ordering allowance in the flooring or roofing calculator.
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