Calculators / Square footage
Square Footage Calculator
Multiply length by width: a 12 × 14 ft room is 168 sq ft (15.61 m²). For an L-shaped room or a whole floor, add each area. Enter feet and inches below.
Find the square footage
0.0039 acres. 24,192 sq in.
How much will it cost? A mid-range remodel of a 150 sq ft kitchen typically costs $61,430, and a 5 × 8 ft bathroom $27,070. Kitchen remodel cost · Bathroom remodel cost
How to calculate square footage
Rectangle or square: length × width. A 12 ft × 14 ft room is 168 sq ft.
Feet and inches: divide the inches by 12 first. 12 ft 6 in is 12.5 ft, so a 12 ft 6 in × 10 ft room is 125 sq ft. If you measured only in inches, multiply the two sides and divide by 144: 60 in × 30 in = 1,800 sq in = 12.5 sq ft.
Triangle: base × height ÷ 2. Circle: 3.1416 × (diameter ÷ 2)². A circle 10 ft across is 78.54 sq ft.
L-shaped and irregular rooms: split the floor into rectangles, find each area and add them up. A 20 × 10 ft area plus a 10 × 8 ft area is 280 sq ft. Use "Add another area" above for each part.
Square footage of common room sizes
| Room size | Square feet | Square meters |
|---|---|---|
| 8 × 10 ft | 80 | 7.4 |
| 10 × 10 ft | 100 | 9.3 |
| 10 × 12 ft | 120 | 11.1 |
| 12 × 12 ft | 144 | 13.4 |
| 12 × 14 ft | 168 | 15.6 |
| 12 × 16 ft | 192 | 17.8 |
| 14 × 16 ft | 224 | 20.8 |
| 16 × 20 ft | 320 | 29.7 |
| 20 × 20 ft | 400 | 37.2 |
| 24 × 24 ft | 576 | 53.5 |
| 30 × 40 ft | 1,200 | 111.5 |
| 40 × 60 ft | 2,400 | 223.0 |
Conversions: 1 sq ft = 144 sq in. 9 sq ft = 1 sq yd. 1 m² = 10.764 sq ft. 1 acre = 43,560 sq ft.
Common questions
How many square feet is a 12x12 room?
A 12 × 12 ft room is 144 sq ft, or 13.4 m².
How many square feet is 30x40?
30 × 40 ft is 1,200 sq ft, about 111.5 m² or 133.3 sq yd.
How do I find the square footage of my house?
Measure each floor or each room and add the areas. For an L-shaped floor, split it into rectangles. Appraisers for mortgages sold to Fannie Mae must follow the ANSI Z765-2021 standard, which reports above-grade and below-grade square footage separately (Home Innovation Research Labs), so a basement is listed apart from the main living area.
How much flooring do I need?
Find the floor's square footage, then add 10% for cuts and mistakes, or 15 to 20% for diagonal and herringbone patterns. Flooring is sold by the box, so divide by the square feet per box and round up. For a 12 × 14 ft room with 10% extra, buy 184.8 sq ft.
How do I convert square feet to square meters?
Multiply square feet by 0.0929, or divide by 10.764. For example, 168 sq ft is 15.61 m².
How we calculated this
Areas use standard geometry, and conversions use exact definitions (1 ft = 0.3048 m, 1 acre = 43,560 sq ft). We test the calculator against 155 worked examples, checked with a separate program. Methodology · Sources.
Measure walls at floor level and round each measurement to the nearest inch.
Changelog
- : Published.
- : Formulas checked against 155 worked examples, verified with a separate program.
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