Room Size Cheat Sheet
A one-page reference for the most searched room dimensions — square feet, square yards, flooring to order (with 10% waste), and paint gallons at 8 ft ceilings.
Last updated:Room Size Cheat Sheet — FootyCalc.com
| Room | Sq ft | Sq yd | Flooring +10% | Paint (2 coats) | Typical use |
|---|---|---|---|---|---|
| 8 × 8 | 64 | 7.1 | 71 sq ft | 1 gal | Half bath, closet |
| 8 × 10 | 80 | 8.9 | 88 sq ft | 2 gal | Small office |
| 10 × 10 | 100 | 11.1 | 110 sq ft | 2 gal | Bedroom, office |
| 10 × 12 | 120 | 13.3 | 132 sq ft | 2 gal | Standard bedroom |
| 12 × 12 | 144 | 16.0 | 158 sq ft | 2 gal | Dining, guest room |
| 12 × 15 | 180 | 20.0 | 198 sq ft | 3 gal | Master bedroom |
| 14 × 16 | 224 | 24.9 | 246 sq ft | 3 gal | Living room |
| 15 × 20 | 300 | 33.3 | 330 sq ft | 4 gal | Large living room |
| 16 × 20 | 320 | 35.6 | 352 sq ft | 4 gal | Master suite |
| 20 × 20 | 400 | 44.4 | 440 sq ft | 5 gal | Garage, great room |
Paint estimates assume 8 ft ceilings, one door and one window subtracted, 350 sq ft/gallon coverage, two coats. Flooring includes 10% straight-lay waste. Carpet: divide sq ft by 9 for sq yd.
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- Data sourced from Average Room Sizes in American Homes (2026).