Square Footage Calculator
Square footage of a room and its cost at a price per square foot.
Input sheet
DIY at your own risk. Calcora's calculators and guides are general estimates and information only — not professional, engineering, legal, or safety advice. Always verify local building codes and permit requirements, and hire a licensed pro for electrical, gas, plumbing, structural, or any work you're not fully comfortable doing yourself.
Square footage is the foundation of nearly every home-project estimate — flooring, paint, tile, and the price you'll pay for any of them. This calculator gives you the area, converts it to other units, and prices it at your rate.
How it works
Length times width for square feet, with conversions to square yards and meters and a cost at your price per square foot.
Area is simply length times width. The calculator also converts to square yards (dividing by 9) and square meters (multiplying by 0.092903), and multiplies by your price per square foot to show the project cost at that rate.
Pricing by the square foot is how flooring, tile, carpet, and many trades quote, so this turns a room measurement directly into a budget number.
Square feet = length × width; square yards = square feet ÷ 9; square meters = square feet × 0.092903; cost = square feet × price per sq ft.
Worked examples
A 12 ft × 10 ft room priced at $4.50 per square foot. → 120 sq ft, costing $540.
12 × 10 = 120 sq ft. 120 × 0.092903 ≈ 11.1 sq m; 120 ÷ 9 ≈ 13.3 sq yd. At $4.50: 120 × 4.50 = $540.
A 20 ft × 15 ft room at $6 per square foot. → 300 sq ft, costing $1,800.
20 × 15 = 300 sq ft × $6 = $1,800. That's 300 ÷ 9 ≈ 33.3 sq yd or about 27.9 sq m.
Tips & gotchas
- For an L-shaped or irregular room, split it into rectangles, find each area, and add them up — then price the total.
- Measure to the inch and convert to a decimal foot (a 12-foot-6-inch wall is 12.5 ft) for an accurate area.
- Add a waste allowance when you carry this number into a flooring or tile order — raw square footage doesn't account for cuts.
- The price-per-square-foot field lets you compare flooring options instantly by swapping the rate.
FAQ
How do I measure a room that isn't a rectangle?
Divide it into rectangular sections, calculate each section's area separately, and add them together. Subtract any large fixed obstructions if they won't be covered.
How do I convert square feet to square yards?
Divide by 9, since a square yard is 3 feet by 3 feet. Carpet is often sold by the square yard, so this conversion matters when comparing prices.
Should I add waste to this number?
The raw square footage is exact for the floor area, but flooring and tile orders need a waste allowance on top for cuts. Carry the area into the relevant material calculator to add it.
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