Room Size Calculator — 61 Common Dimensions

How many square feet is a 10x12, 12x15, or 20x20 room? Find every common US room size with instant conversions and material estimates.

Last updated:

Popular Room Dimensions

DimensionsSquare FeetSquare MetersTypical Use
8 × 8 ft 64 sq ft 5.95 m² half bath
8 × 10 ft 80 sq ft 7.43 m² small bedroom
8 × 12 ft 96 sq ft 8.92 m² small bedroom
9 × 12 ft 108 sq ft 10.03 m² child's bedroom
10 × 10 ft 100 sq ft 9.29 m² small bedroom
10 × 11 ft 110 sq ft 10.22 m² kid's bedroom
10 × 12 ft 120 sq ft 11.15 m² standard bedroom
10 × 14 ft 140 sq ft 13.01 m² guest bedroom
10 × 15 ft 150 sq ft 13.94 m² master closet
10 × 16 ft 160 sq ft 14.86 m² long hallway
10 × 20 ft 200 sq ft 18.58 m² garage bay
11 × 11 ft 121 sq ft 11.24 m² bedroom
11 × 12 ft 132 sq ft 12.26 m² standard bedroom
11 × 13 ft 143 sq ft 13.29 m² bedroom
11 × 14 ft 154 sq ft 14.31 m² master bedroom
12 × 12 ft 144 sq ft 13.38 m² standard bedroom
12 × 13 ft 156 sq ft 14.49 m² bedroom
12 × 14 ft 168 sq ft 15.61 m² master bedroom
12 × 15 ft 180 sq ft 16.72 m² master bedroom
12 × 16 ft 192 sq ft 17.84 m² living room
12 × 18 ft 216 sq ft 20.07 m² great room
12 × 20 ft 240 sq ft 22.30 m² living room
12 × 24 ft 288 sq ft 26.76 m² garage bay
13 × 13 ft 169 sq ft 15.70 m² bedroom
13 × 14 ft 182 sq ft 16.91 m² master bedroom
13 × 15 ft 195 sq ft 18.12 m² primary bedroom
14 × 14 ft 196 sq ft 18.21 m² master bedroom
14 × 15 ft 210 sq ft 19.51 m² master bedroom
14 × 16 ft 224 sq ft 20.81 m² master suite
14 × 18 ft 252 sq ft 23.41 m² great room
14 × 20 ft 280 sq ft 26.01 m² great room
15 × 15 ft 225 sq ft 20.90 m² master bedroom
15 × 16 ft 240 sq ft 22.30 m² living room
15 × 18 ft 270 sq ft 25.08 m² family room
15 × 20 ft 300 sq ft 27.87 m² great room
15 × 25 ft 375 sq ft 34.84 m² long living room
16 × 16 ft 256 sq ft 23.78 m² primary suite
16 × 18 ft 288 sq ft 26.76 m² great room
16 × 20 ft 320 sq ft 29.73 m² great room
16 × 24 ft 384 sq ft 35.67 m² open great room
18 × 18 ft 324 sq ft 30.10 m² great room
18 × 20 ft 360 sq ft 33.45 m² family great room
18 × 24 ft 432 sq ft 40.13 m² great room
20 × 20 ft 400 sq ft 37.16 m² 2-car garage
20 × 24 ft 480 sq ft 44.59 m² 2-car garage
20 × 25 ft 500 sq ft 46.45 m² open studio
20 × 30 ft 600 sq ft 55.74 m² 2-car garage + shop
22 × 22 ft 484 sq ft 44.97 m² oversized 2-car garage
22 × 24 ft 528 sq ft 49.05 m² oversized 2-car garage
24 × 24 ft 576 sq ft 53.51 m² standard 2-car garage
24 × 30 ft 720 sq ft 66.89 m² shop
24 × 36 ft 864 sq ft 80.27 m² detached shop
24 × 40 ft 960 sq ft 89.19 m² 3-car garage + shop
25 × 25 ft 625 sq ft 58.06 m² great room
30 × 30 ft 900 sq ft 83.61 m² ADU
30 × 40 ft 1,200 sq ft 111.48 m² pole barn
30 × 50 ft 1,500 sq ft 139.35 m² pole barn
40 × 40 ft 1,600 sq ft 148.64 m² warehouse bay
40 × 60 ft 2,400 sq ft 222.97 m² pole barn
50 × 50 ft 2,500 sq ft 232.26 m² commercial warehouse
50 × 100 ft 5,000 sq ft 464.52 m² warehouse

Don't See Your Room Size?

Use the main Room Calculator to compute any custom dimensions in feet, inches, yards, or meters — plus waste allowance and cost per square foot.

What Counts as a "Room Size"?

A room's "square footage" is the floor area measured wall-to-wall. In real estate (ANSI Z765), interior measurements are used. For flooring and paint, you also measure wall-to-wall, then subtract built-ins if needed.

US Bedroom Size Standards