Square Footage Calculator
Calculate the square footage of a rectangular room and the estimated material cost per square foot.
| Dimension | Value |
|---|---|
| Length | 15 ft |
| Width | 12 ft |
| Area | 180 sq ft |
A single rectangle: 15 ft × 12 ft = 180 sq ft.
ƒShow your work
- 1Area = length × width = 15 ft × 12 ft = 180 sq ft
About the Square Footage Calculator
This calculator multiplies a room's length and width to get its area in square feet, with an optional price-per-square-foot field to turn that area straight into a material cost estimate. It's the number flooring, paint, carpet and countertop quotes are almost always based on.
It's used before ordering flooring or carpet, before getting a paint or tile quote, when listing or renting a property and needing an accurate square footage figure, or just settling a casual disagreement about how big a room actually is.
Add a price per square foot and the same calculation gives you an estimated total cost for the room — handy for comparing quotes or budgeting a project before committing to a specific material.
Frequently asked questions
How do I measure a room for accurate square footage?
Measure the length and width of the room at the floor, in a straight line wall to wall, using a tape measure or laser measure for accuracy. For irregular rooms, break the space into rectangles, calculate each separately, and add the areas together.
Does this work for rooms that aren't perfectly rectangular?
Not directly — this calculator handles a single rectangle. For an L-shaped or irregular room, split it mentally into two or more rectangular sections, run each one through the calculator separately, and add the results together for the total.
Should I subtract closets, alcoves or built-ins from the square footage?
It depends on what you're using the number for — for flooring or paint material estimates, you usually want the true covered area including closets and alcoves you're actually finishing; for listing square footage, local real estate conventions vary on what counts.
How do I convert square feet to square yards for flooring quotes?
Divide square feet by 9, since a square yard is 3 feet by 3 feet (9 square feet). Carpet in particular is commonly priced by the square yard rather than the square foot.
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