Square Footage Calculator
Square footage is length times width, measured in feet. A 12x14 room is 12 × 14 = 168 square feet.
Add a row for each room or section and enter its shape and dimensions. Totals in square feet and square yards update as you type, with square meters alongside.
| Shape | Length / diameter (ft) | Width / height (ft) | Sq ft |
|---|
Circle uses diameter, not radius. The second field is ignored for circles.
How to calculate square footage
The formula depends on the shape of the space. Measure in feet and the result comes out in square feet directly.
For a whole floor plan, break it into shapes like these and add up the area of each one. That's what the calculator above does across rows.
How many square feet is 12x14? Common sizes
Multiply the two dimensions. A 12x14 room is 12 × 14 = 168 square feet, and a 12x30 shed or garage bay is 12 × 30 = 360 square feet. The table covers sizes people search for most, with square yards for carpet and flooring quotes.
| Dimensions | Square feet | Square yards |
|---|---|---|
| 8′ × 10′ | 80 sq ft | 8.89 sq yd |
| 10′ × 10′ | 100 sq ft | 11.11 sq yd |
| 10′ × 12′ | 120 sq ft | 13.33 sq yd |
| 12′ × 6′ | 72 sq ft | 8.00 sq yd |
| 12′ × 12′ | 144 sq ft | 16.00 sq yd |
| 12′ × 14′ | 168 sq ft | 18.67 sq yd |
| 12′ × 16′ | 192 sq ft | 21.33 sq yd |
| 12′ × 18′ | 216 sq ft | 24.00 sq yd |
| 12′ × 20′ | 240 sq ft | 26.67 sq yd |
| 12′ × 24′ | 288 sq ft | 32.00 sq yd |
| 12′ × 28′ | 336 sq ft | 37.33 sq yd |
| 12′ × 30′ | 360 sq ft | 40.00 sq yd |
| 12′ × 32′ | 384 sq ft | 42.67 sq yd |
| 12′ × 40′ | 480 sq ft | 53.33 sq yd |
| 14′ × 13′ | 182 sq ft | 20.22 sq yd |
| 14′ × 16′ | 224 sq ft | 24.89 sq yd |
| 14′ × 40′ | 560 sq ft | 62.22 sq yd |
| 15′ × 20′ | 300 sq ft | 33.33 sq yd |
| 20′ × 20′ | 400 sq ft | 44.44 sq yd |
| 20′ × 40′ | 800 sq ft | 88.89 sq yd |
| 20′ × 60′ | 1,200 sq ft | 133.33 sq yd |
| 30′ × 80′ | 2,400 sq ft | 266.67 sq yd |
Order doesn't matter. 20 x 12 and 12 x 20 are both 240 square feet. Searches like "40 20 in square feet" mean 40 feet by 20 feet, which is 800 square feet.
Square feet of a rectangle
Most floors, walls, patios and shed bases are rectangles, so one formula covers them. Measure both sides in feet and multiply.
If a side isn't a whole number of feet, divide the extra inches by 12 and add the result. A wall of 12′6″ is 12 + 6 ÷ 12 = 12.5 feet, and 14′3″ is 14 + 3 ÷ 12 = 14.25 feet.
Square inches to square feet
When both sides are measured in inches, multiply them for square inches and divide by 144, because one square foot is 12 × 12 = 144 square inches. A 12-inch by 18-inch tile is 12 × 18 = 216 square inches, and 216 ÷ 144 = 1.5 square feet.
How big is 33 square feet? Square feet to dimensions
To picture an area, find the side of a square with that area, or divide the area by one side you already know. Enter a square footage below.
| Area (sq ft) | Known side (ft, optional) |
|---|---|
Measuring an irregular room
Most rooms aren't a clean rectangle. Split the floor plan into pieces you can measure with a tape: a main rectangle plus a closet nook, or a rectangle plus a triangular bay window. Find the area of each piece with the matching formula above and add them into one total. A bay window alcove that's 3′ wide and juts out 2′ adds a triangle of 3 × 2 ÷ 2 = 3 sq ft to the room's rectangle. Add a row per piece in the calculator and the running total handles the rest.
Converting square feet to other units
Flooring is often priced per square yard, and international specs use square meters. An acre is 43,560 square feet.
| Convert | Do this |
|---|---|
| Square feet to square yards | ÷ 9 |
| Square feet to square meters | × 0.0929 |
| Square yards to square feet | × 9 |
| Square meters to square feet | × 10.764 |
| Square feet to acres | ÷ 43,560 |
| Acres to square feet | × 43,560 |
Need to go the other direction and turn an area into a count of boards or planks? The linear foot calculator converts square feet to linear feet once you know the material's width.
Frequently asked questions
How many square feet is a 12x14 room?
12 × 14 = 168 square feet. The order doesn't change the answer, so a 14x12 room is also 168 square feet.
How many square feet is a 12x12 room?
12 × 12 = 144 square feet, a common bedroom size and a useful number to memorize for quick checks.
How do I find the square feet of a rectangle?
Measure the length and the width in feet, then multiply them. A 12x20 rectangle is 12 × 20 = 240 square feet. If you measured in inches, multiply the inches and divide by 144.
How do I convert square feet to square yards?
Divide by 9. A 300-square-foot room is 300 ÷ 9 = 33.33 square yards, which matters when carpet or flooring is priced per yard.
Do closets count in a home's total square footage?
Under ANSI Z765, a common US standard for measuring homes, square footage counts finished living area above grade. Closets and hallways inside that area count. Garages don't count, and a finished basement is reported as a separate below-grade figure.
How do I measure the square footage of an irregular room?
Split the floor into rectangles and triangles you can measure on their own, then add up their areas. See the irregular-room section above for a worked example.