12x20 in square feet, square yards and square meters
A one-car garage, a big shed or a long living room is about this size. The area is length times width: 12 × 20 = 240 sq ft. Measure to the walls at the longest point, and add closets and alcoves you will floor.
| Unit | This room |
|---|---|
| Square feet | 240 sq ft |
| Square yards | 26.67 sq yd |
| Square meters | 22.30 sq m |
| Perimeter (around the walls) | 64 ft |
| Acres | 0.00551 acres |
What to buy for 240 sq ft
| Material | Amount |
|---|---|
| Flooring (10% waste, 20 sq ft boxes) | 264 sq ft, 14 boxes |
| Carpet off a 12 ft roll (before trimming) | 26.7 sq yd, one piece |
| 12 × 12 in tiles (10% waste) | 264 tiles |
| Baseboard (full perimeter, before doorways) | 64 ft |
Flooring with different waste allowances
Straight layouts need about 5 to 7%, diagonal layouts 10%, and herringbone or patterns 15%.
| Waste | Flooring to buy | Boxes of 20 sq ft |
|---|---|---|
| 5% waste | 252 sq ft | 13 |
| 10% waste | 264 sq ft | 14 |
| 15% waste | 276 sq ft | 14 |
Use the square footage calculator for L-shaped rooms, circles and triangles, the carpet calculator for the roll layout with trimming, or the flooring calculator for a full flooring estimate.
12 × 20: single garage, long shed or narrow living room
A 12 × 20 footprint covers 240 sq ft. It is a popular size for a one-car garage and for the bigger prefab sheds, because 12 ft is wide enough to open car doors and 20 ft is long enough for a full-size vehicle with a little space at the nose. Indoors, the same shape is a long living room where seating gathers at one end.
For a garage or shed floor, a 4 in slab with a small allowance takes about 3.3 cubic yards of ready-mix. Finished as a room, it is 14 boxes of flooring (264 sq ft), and 64 ft of 8 ft wall adds up to 512 sq ft, of which 461 is paintable after a door and two windows. Two coats: 2.63 gallons, so 2 gallons + 3 quarts. Coating a bare concrete floor is a separate product with its own coverage on the can.
Want to change anything else? The calculator above is the full Square Footage Calculator: edit any number and the results update instantly.
Frequently asked questions
How many square feet is a 12x20 room?
240 square feet (12 ft × 20 ft). That is 26.67 square yards or 22.30 square meters.
How many square feet of flooring do I need for a 12x20 room?
The floor is 240 sq ft, so buy about 264 sq ft with 10% for cuts and waste. That is 14 boxes at 20 sq ft a box.
How much carpet is a 12x20 room?
26.67 square yards of floor. Carpet comes off a 12 ft wide roll, so you buy whole strips: here one 12 ft wide piece 20 ft long, which is 240 sq ft (26.7 sq yd) of carpet for a 240 sq ft floor, plus a few inches a strip for trimming.
Related sizes and guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.