Square Footage Calculator
Whether you're planning a flooring project, buying paint, or estimating material costs, knowing the exact square footage of a room or area is the essential first step. This calculator converts your length and width measurements into square feet, square yards, and square meters so you have every unit you need for any project.
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Formula
A = L × W
A is the area in square feet. L is the length in feet and W is the width in feet. Divide by 9 to get square yards, or multiply by 0.0929 to get square meters.
How to use the Square Footage Calculator
- 1
Enter your length (ft)
Value should be in ft.
- 2
Enter your width (ft)
Value should be in ft.
- 3
Read your results instantly
Results update in real time as you type.
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Why Square Footage Matters
Square footage is the standard unit for measuring floor space, wall area, and land in the United States. Accurate square footage calculations help you order the right amount of flooring, paint, tile, or carpet — avoiding costly over-ordering or frustrating shortfalls. Even a small measurement error can compound quickly across a large area, so it pays to measure twice and calculate once.
How to Measure Correctly
For rectangular rooms, measure the longest wall for length and the perpendicular wall for width. For irregular spaces, break the room into rectangular sections and sum the results. Always measure in feet; if your tape reads in inches, divide by 12 to convert. Add 10% waste factor when ordering materials like hardwood or tile to account for cuts and breakage.
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Converting Between Units
Square yards are commonly used for carpet and some types of roofing. Square meters are the international standard and appear on many imported material spec sheets. One square yard equals 9 square feet. One square meter equals roughly 10.76 square feet. This calculator provides all three automatically so you can match whatever unit your supplier uses.
Tips & Insights
Measure Multiple Times
Always measure a room at least twice from different starting points. Walls are rarely perfectly parallel, so averaging two measurements gives a more accurate result.
Add a Waste Factor
For flooring and tile, add 10% to your square footage to account for cuts and waste. For carpet, 15% is safer. Buy extra — it's cheaper than a second trip to match dye lots.
Sketch It Out
Draw a rough floor plan before measuring. Label each measurement as you go so you can easily re-check your numbers without re-measuring the room.
Worked Examples
Living Room Floor
252 sq ft — enough to order 28 sq yd of carpet with a 10% waste factor.
Backyard Patio
300 sq ft — you would need 34 sq yd of pavers or about 27.9 square meters.
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Frequently Asked Questions
How do I calculate square footage of an L-shaped room?
Divide the L-shape into two rectangles, calculate each area separately, then add the two results together.
How many square feet are in a square yard?
One square yard equals 9 square feet (3 ft × 3 ft).
How do I convert square feet to square meters?
Multiply square feet by 0.0929. For example, 300 sq ft × 0.0929 = 27.87 square meters.
What is the average square footage of a US home?
The average new single-family home in the US is approximately 2,300 square feet as of recent years.
Do I need to subtract for doorways when calculating flooring?
For most flooring estimates you can ignore doorways — the extra material accounts for cuts. For very precise tile work, subtracting doorway area (about 3 sq ft each) gives a tighter estimate.
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