How Many Square Feet Is a 12x20 Room?
Total area
240 sq ft
Twelve feet by twenty feet.
How that number is worked out
These are the figures this page was built with and every line the calculator produces from them. Change anything above and all of it moves.
- Length12 ft
- Width20 ft
- How many rooms or areas this size1
- Extra area to add0 sq ft
Total area240 sq ft
| One area | 240 sq ft |
|---|---|
| Times 1, plus extra | 240 sq ft |
| Square yards | 26.67 |
| Square meters | 22.3 |
| Perimeter of one area | 64 ft |
What else matters here
Two hundred and forty square feet. That is a large master bedroom, a generous home office, or a complete studio accessory dwelling unit in the jurisdictions that allow one.
As an ADU it is at the small end and deliberately so. Many cities set a minimum around 150 to 220 square feet for a studio unit and a maximum somewhere between 800 and 1,200, and the binding constraint is rarely the floor area. It is the setbacks, the lot coverage limit, whether a second kitchen is permitted, parking, and whether the sewer and the electrical service can take another dwelling. Check those before drawing anything.
What this calculator assumes
- Length times width, times how many areas are that size. For an L shaped room, split it into two rectangles and run this twice.
- Square yards are square feet divided by nine, which is how carpet is still quoted in much of the country.
Questions people ask
How many square feet is a 12x20 room?
240 square feet, which is 26.67 square yards and 22.3 square meters.
Is 240 square feet enough for a studio apartment?
It is at the small end but it is a real size. Many jurisdictions set a minimum dwelling unit around 150 to 220 square feet, so 240 clears it.
What usually stops an ADU getting approved?
Rarely the floor area. Setbacks, lot coverage, parking, whether a second kitchen is allowed, and the capacity of the sewer and electrical service are the usual blockers.
The square footage calculator takes any dimensions you like and hands back the same list.