Room size lookup

Square footage for the room sizes people look up most, from an 8×10 box room to a 30×40 shop — each one drawn to scale, converted into every unit, and costed out in materials.

Room size	Square feet	Square metres
8 × 10 ft	80	7.43
8 × 12 ft	96	8.92
10 × 10 ft	100	9.29
10 × 12 ft	120	11.15
10 × 14 ft	140	13.01
11 × 13 ft	143	13.29
12 × 12 ft	144	13.38
10 × 15 ft	150	13.94
12 × 14 ft	168	15.61
12 × 15 ft	180	16.72
12 × 16 ft	192	17.84
13 × 15 ft	195	18.12
14 × 14 ft	196	18.21
10 × 20 ft	200	18.58
12 × 18 ft	216	20.07
14 × 16 ft	224	20.81
15 × 15 ft	225	20.9
12 × 20 ft	240	22.3
16 × 16 ft	256	23.78
14 × 20 ft	280	26.01
12 × 24 ft	288	26.76
15 × 20 ft	300	27.87
16 × 20 ft	320	29.73
20 × 20 ft	400	37.16
20 × 24 ft	480	44.59
24 × 24 ft	576	53.51
20 × 30 ft	600	55.74
20 × 40 ft	800	74.32
30 × 30 ft	900	83.61
30 × 40 ft	1,200	111.48

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How to read this room size chart

Every row is a rectangular room quoted the way people describe them — 10x12, 12x15, 20x20 — with the square footage worked out by multiplying the two sides. A 12 × 15 ft room is 180 square feet; a 20 × 20 ft room is 400. Each dimension has its own page showing the room drawn to scale, converted into square metres, square yards and acres, and costed out in flooring, tile, paint, carpet, drywall and hardwood.

What counts as a normal room size

Sizes cluster by function rather than by taste. A single bedroom is typically 10 × 10 to 12 × 12, a primary bedroom 12 × 15 to 14 × 16, and a standard US bedroom needs to be at least 70 square feet with no dimension under 7 ft to count as a bedroom at all. Living rooms usually run 12 × 18 to 16 × 20, a one-car garage is around 12 × 20 and a two-car garage 20 × 20, and a workshop or shop building is commonly 24 × 30 or 30 × 40.

What the "what fits" figures mean

Each room page counts how many beds, cars, desks or tables physically fit, laid as a plain grid in whichever direction packs more in, with no walkways and no diagonal placement. Treat those counts as a floor rather than a ceiling: they tell you the room is large enough, not that the layout would be comfortable. A usable room generally wants 30 to 36 inches of clearance on at least one side of each piece of furniture.

For a room that is not a plain rectangle, use the L-shape calculator or pick another shape from the calculator index. To add several rooms into one house total, use the multi-room calculator.