Square Footage Calculator
Enter a length and width to instantly get the area in square feet and square meters, with an optional cost estimate.
Example
A room 12 ft long by 10 ft wide is 12 x 10 = 120 sq ft, which equals about 11.15 m². At $5 per sq ft, the total cost is 120 x $5 = $600.00.
How it works
Area is length multiplied by width. Square feet are converted to square meters by multiplying by 0.09290304, and total cost is area in square feet times the price per square foot.
Good to know
This Square Footage Calculator turns a simple length and width measurement into total area, shown at once in square feet, square meters, and square yards, with an optional total cost based on a price per square foot. It is built for anyone sizing up a physical space or surface: homeowners pricing flooring, carpet, tile, paint, or sod; renters estimating a room's usable space; and contractors or DIYers who need a fast, repeatable area figure without a spreadsheet.
Reach for it whenever you are buying material sold by the square foot or square meter, comparing room sizes, or estimating a job before ordering. The quantity field lets you total several identical sections in one go, so four matching 12-by-10 bedrooms or a run of same-sized wall panels can be calculated together rather than one at a time.
Reading the result is straightforward: the large number is your total area in square feet, and the three stats break it down into metric (square meters), square yards (useful for carpet, which is often priced per yard), and total cost. Cost only appears when you enter a price above zero, so a dash simply means no price was given. All figures use the inputs exactly as typed, so double-check your units before trusting the output.
A practical caveat: this tool assumes a clean rectangle. Real rooms have alcoves, closets, sloped ceilings, and angled walls, so for an L-shaped or irregular space, split it into rectangles, calculate each, and add the results. When ordering material, add a waste allowance (commonly 5 to 10 percent for flooring and tile) on top of the calculated area to cover cuts, breakage, and pattern matching.
Frequently asked questions
How do I convert square feet to square meters?
Multiply the area in square feet by 0.09290304. For example, 120 sq ft x 0.09290304 = about 11.15 square meters. This calculator does the conversion for you automatically.
What does the quantity field do?
Quantity multiplies one length-by-width area by the number of identical sections, so you can total several same-sized rooms or panels at once. Leave it at 1 for a single area.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser. Your inputs never leave your device, and it works offline once loaded.
Is this calculator free?
Yes, completely free with no sign-up and no limits.
People also ask
How do I calculate square footage of a room?
Measure the room's length and width in feet, then multiply them together. For example, a 12 ft by 10 ft room is 120 square feet. For non-rectangular rooms, divide the space into rectangles, calculate each, and add the totals.
How many square feet are in a square yard?
One square yard equals 9 square feet, since a yard is 3 feet and 3 x 3 = 9. To convert square feet to square yards, divide the square footage by 9; this calculator shows the square yard figure automatically.
How do I figure out how much flooring to buy?
Calculate the room's area in square feet, then add a waste allowance, commonly 5 to 10 percent, to cover cuts and mistakes. Many flooring products are sold by the box, so divide your total by the coverage listed per box and round up.
What is the difference between square feet and linear feet?
Square feet measure two-dimensional area (length times width), while linear feet measure a single straight-line length. Materials like trim or baseboard are sold by the linear foot, whereas flooring and paint are typically sold by the square foot.
How do I calculate square footage for an irregular or L-shaped room?
Break the space into separate rectangles, find the area of each by multiplying its length by its width, then add the areas together. The quantity field helps only when the sections are identical in size.
How much paint do I need for a given square footage?
Estimate wall area rather than floor area, then divide by the coverage rate on the paint can, often around 350 to 400 square feet per gallon for one coat. Account for multiple coats and subtract large openings like windows and doors if you want a tighter estimate.
How do I convert square meters back to square feet?
Multiply the square meter figure by about 10.7639 to get square feet, since one square meter equals roughly 10.76 square feet. This is the reverse of the 0.09290304 factor the calculator uses to go from square feet to square meters.
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