Square footage calculator.
Work out the area of a room or space. Enter the length and width in feet and the calculator returns the square footage, square yards, square metres and an optional material cost.
Room dimensions
LiveSquare footage is length times width. Enter a price per square foot to estimate the cost of flooring, turf, tiles or paint.
Area
120 sq ft
length times width
Assumes a rectangular area. For L-shaped spaces, add the rectangles separately. Calculations run in your browser; nothing you enter is stored.
How it works
Length times width
The square footage of a rectangle is its length multiplied by its width, with both measured in feet. A room 12 feet by 10 feet is 120 square feet. That single number drives most flooring, paint and material estimates.
To convert, divide square feet by 9 for square yards, or multiply by 0.0929 for square metres. Multiply by a price per square foot and you get a quick material cost.
Reference
Square footage examples.
The area in square feet for common room and space dimensions.
| Dimensions (ft) | Square feet |
|---|---|
| 10 x 10 | 100 |
| 12 x 10 | 120 |
| 20 x 15 | 300 |
| 8 x 8 | 64 |
| 100 x 50 | 5000 |
The full guide
The complete guide to square footage.
How to measure it, convert it, and use it for material estimates.
Measuring square footage
For a rectangular space, measure the length and the width in feet and multiply them. The result is the area in square feet. For rooms that are not simple rectangles, split them into rectangles, find each area, and add them up.
Round measurements to the nearest inch and convert inches to a fraction of a foot, since 6 inches is 0.5 feet.
Converting the units
Square feet convert easily: divide by 9 for square yards, the common unit for carpet, or multiply by about 0.0929 for square metres. Going the other way, a square metre is about 10.76 square feet.
Always confirm which unit a supplier prices in before ordering material.
Estimating material and cost
Once you have the area, multiply by the coverage or price per square foot to estimate what you need. Flooring, turf, tile and paint are usually sold this way. Add a waste allowance, often 5 to 10%, for cuts and mistakes.
Enter a price per square foot above and the calculator gives a quick cost estimate.
Common uses
Square footage drives real-estate listings, flooring and tiling jobs, landscaping, painting and rent calculations. Knowing it lets you compare spaces and budget materials accurately.
For circular areas, use the circumference calculator, which also reports the area of a circle.
The formula
Length times
width.
Square footage is length times width in feet; divide by 9 for square yards or multiply by 0.0929 for square metres.
Circle area ›# Area
square_feet = length × width
sq_yards = sq_ft / 9
sq_metres = sq_ft × 0.0929
# 12 x 10
120 sq ftQuestions
Square footage questions.
How do I calculate square footage?
+
Multiply the length by the width, both in feet. A 12 by 10 foot room is 120 square feet. Enter your dimensions above and the calculator does it.
How do I convert square feet to square metres?
+
Multiply the square feet by 0.0929. To go the other way, multiply square metres by about 10.76 to get square feet.
How much material should I buy?
+
Multiply the square footage by your coverage or price per square foot, then add 5 to 10% for waste from cuts and mistakes.
How do I measure an irregular room?
+
Split it into rectangles, calculate the square footage of each, and add them together. For circles, use the circumference calculator, which gives area too.
Is this square footage calculator free?
+
Yes. It is completely free with no sign-up, and every calculation runs locally in your browser, so nothing you enter is stored or sent anywhere.
About the developer
Jean Borg
Jean builds and maintains every calculator on freecalculators.pro from Malta, with a focus on tools that are fast, free and show their working. The square footage calculator converts to yards and metres and estimates material cost.