Enter the length and width of a room, plot or wall and get its area in square feet, square metres and square yards at once — the first number you need for flooring, paint, tiles and property listings.
What Is a Square Footage Calculator?
A square footage calculator finds the area of a rectangular space by multiplying its length by its width, and shows the result in the three units used in construction and real estate: square feet, square metres and square yards. Area is the starting number for almost every home project — flooring, carpet, paint, tiles, ceiling and even property prices are all quoted per unit of area.
How to Use
- Measure the length and width of the space.
- Enter both numbers and choose whether they are in feet or metres.
- Click “Calculate Area”.
- Use the area in the unit your supplier or listing uses.
Formula
Area = length × width. Conversions: 1 sq ft = 0.09290304 sq m; 1 sq m = 10.7639104 sq ft; 1 sq yard = 9 sq ft.
Worked Example
A room 12 ft long and 10 ft wide: area = 12 × 10 = 120.00 sq ft. In square metres: 120 × 0.09290304 = 11.15 sq m. In square yards: 120 ÷ 9 = 13.33 sq yards.
How It Works, In Plain Words
The tool asks for three things: a length, a width, and the unit those measurements are in. Everything else is one multiplication and two conversions. First the multiplication: length × width. With the page’s example, 12 ft × 10 ft = 120.00 sq ft — the count of one-foot squares that would cover the floor. Because the unit was set to feet, the tool then converts that 120 sq ft into the other two units using the factors in the formula above: × 0.09290304 gives 11.15 sq m, and ÷ 9 gives 13.33 sq yards, since one square yard holds exactly 9 square feet. Choose metres instead and the order flips: the multiplication produces square metres first, and the tool multiplies by 10.7639104 to get square feet, with yards still taken from the square feet by dividing by 9. All three answers print together so you never have to convert twice or guess which figure a supplier wants. One quiet detail: the unit applies to both measurements at once — the tool assumes length and width were taken in the same unit, which is why mixing feet and metres appears in the mistakes list below.
Real-World Uses
First scenario: the flooring starting point. The Benefits list below calls this area the starting point for flooring, paint and tile quantities, and the worked example shows why: the 12 × 10 ft room’s 120 sq ft is the number every later decision builds on — hand it to the Flooring Calculator and it adds waste and boxes. Second scenario: comparing properties listed in different units. One listing quotes square feet, another square metres, and the numbers cannot be compared directly. Run the room through here once and 120.00 sq ft and 11.15 sq m sit side by side — the same space in both languages, ready for a fair comparison. Third scenario: carpet quoted in square yards. The buyer measures in feet, the carpet is sold by the yard, and the tool’s third line — 13.33 sq yards for the example room — is the figure to take to the shop, with no mental division by 9 in the aisle.
Benefits
- All three area units from a single measurement
- The starting point for flooring, paint and tile quantities — our other construction calculators build on it
- Works in feet or metres
- Useful for comparing property sizes listed in different units
Features of Our Tool
- Instant results in your browser
- No sign-up, no download, 100% free
- Works on mobile, tablet and desktop
- Clear step-by-step explanation below the tool
- Private — your entries never leave your device.
Common Mistakes
- Measuring only the floor’s longest walls in an L-shaped room — split irregular rooms into rectangles, calculate each, and add them
- Mixing feet and metres in the same measurement
- Forgetting skirting, alcoves and closets when the area is for flooring material
Common Mistakes to Avoid
Three more errors show up often. First, measuring wall to wall but forgetting the floor continues under fitted furniture and into doorways: for materials, the area the material must cover is what counts, and the list above already flags skirting, alcoves and closets. Second, rounding the measurements before multiplying — a room measured as “about 12 by about 10” can drift far from 120 sq ft once the guesses multiply, so measure to the fraction and let the tool do the rounding at the end. Third, using the area of one room as the area of the whole home: run each room separately and add the results, exactly as the FAQ describes for an L-shaped room.
FAQ
How do I calculate square footage?
Multiply the length by the width — a 12 ft by 10 ft room is 120 sq ft.
How many square metres is 120 sq ft?
11.15 sq m (multiply square feet by 0.09290304).
How many square feet are in a square yard?
9 sq ft make 1 sq yard, so divide square feet by 9.
How do I measure an L-shaped room?
Split it into two rectangles, calculate each area separately, and add the two results.
Is square footage the same as area?
Yes — “square footage” is simply the area expressed in square feet.
What if my measurements are in inches or centimetres?
Convert them first with the Length Converter in Related Calculators below, or divide inches by 12 to get feet before entering. The unit selector only offers feet and metres, and both measurements must be in the same one — mixing them is in the mistakes list above for a reason.
Does the order of length and width matter?
No. Multiplication gives the same area either way round: 12 × 10 and 10 × 12 both give the worked example’s 120.00 sq ft. What matters is that the two numbers are the two sides of the same rectangle, measured in the same unit.