How Many Square Feet Is a 20x20 Room?
Total area
400 sq ft
Twenty 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.
- Length20 ft
- Width20 ft
- How many rooms or areas this size1
- Extra area to add0 sq ft
Total area400 sq ft
| One area | 400 sq ft |
|---|---|
| Times 1, plus extra | 400 sq ft |
| Square yards | 44.44 |
| Square meters | 37.16 |
| Perimeter of one area | 80 ft |
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 20x20 room?
400 square feet, which is 44.44 square yards and 37.16 square meters.
How much concrete for a 20x20 slab?
About 5.43 cubic yards at four inches with waste, or 8.15 at six inches. There is a page for that exact slab on this site.
Different numbers?
The square footage calculator takes any dimensions you like and hands back the same list.
Other common sizes
8x10 room80 sq ft9x9 room81 sq ft8x12 room96 sq ft10x10 room100 sq ft10x12 room120 sq ft11x12 room132 sq ft10x14 room140 sq ft12x12 room144 sq ft12x15 room180 sq ft14x14 room196 sq ft15x15 room225 sq ft16x16 room256 sq ft14x20 room280 sq ft15x20 room300 sq ft18x18 room324 sq ft20x30 building600 sq ft
15 more sizes are answered on the square footage calculator page