Room dimensions in square feet
A 12x20 room is 240 square feet. A 15x20 is 300, a 10x16 is 160 and a 20x20 is 400. Multiply length by width — that is the whole calculation. The chart below covers the 24 most-looked-up room dimensions, and every row opens the calculator with those numbers already filled in.
Room Size Calculator
Quick answer: common room sizes in square feet
The most-searched room dimensions and their square footage:
5×5 ft = 25 sq ft (storage locker, small closet).
5×10 ft = 50 sq ft (storage unit, walk-in closet, half bath).
8×10 ft = 80 sq ft (small home office, child's bedroom).
10×10 ft = 100 sq ft (small bedroom, standard storage unit).
10×12 ft = 120 sq ft (standard bedroom).
12×12 ft = 144 sq ft (standard bedroom, small dining).
12×14 ft = 168 sq ft (larger bedroom, small living room).
14×16 ft = 224 sq ft (master bedroom, family room).
15×20 ft = 300 sq ft (large living room).
20×20 ft = 400 sq ft (great room, large studio apartment).
Room dimensions to square feet: the chart
Every row below is length × width, the only formula involved. Square yards are given as well because carpet, sod and some vinyl are still sold that way — divide square feet by 9.
Click any row to open the calculator above with those dimensions already entered, then adjust the waste factor or add a price per square foot.
The dimensions are listed in the order people actually look them up rather than smallest to largest, so the sizes most likely to be yours are at the top.
| Dimensions | Square feet | Square yards | Typically |
|---|---|---|---|
| 12 × 20 ft | 240 sq ft | 26.7 sq yd | Long living room, one-car garage |
| 15 × 20 ft | 300 sq ft | 33.3 sq yd | Large living room, master suite |
| 10 × 16 ft | 160 sq ft | 17.8 sq yd | Bedroom, home office |
| 12 × 14 ft | 168 sq ft | 18.7 sq yd | Standard bedroom, small living room |
| 10 × 20 ft | 200 sq ft | 22.2 sq yd | Narrow living room, two storage units |
| 20 × 20 ft | 400 sq ft | 44.4 sq yd | Great room, two-car garage |
| 12 × 13 ft | 156 sq ft | 17.3 sq yd | Standard bedroom |
| 14 × 14 ft | 196 sq ft | 21.8 sq yd | Large bedroom, dining room |
| 12 × 16 ft | 192 sq ft | 21.3 sq yd | Master bedroom, family room |
| 11 × 13 ft | 143 sq ft | 15.9 sq yd | Secondary bedroom |
| 11 × 20 ft | 220 sq ft | 24.4 sq yd | Long bedroom, finished basement bay |
| 12 × 25 ft | 300 sq ft | 33.3 sq yd | Great room, long basement |
| 15 × 30 ft | 450 sq ft | 50.0 sq yd | Open-plan living and dining |
| 26 × 26 ft | 676 sq ft | 75.1 sq yd | Large two-car garage, shop |
| 10 × 10 ft | 100 sq ft | 11.1 sq yd | Small bedroom, standard storage unit |
| 19 × 20 ft | 380 sq ft | 42.2 sq yd | Family room |
| 12 × 23 ft | 276 sq ft | 30.7 sq yd | Long living room |
| 20 × 26 ft | 520 sq ft | 57.8 sq yd | Three-car garage, large great room |
| 20 × 21 ft | 420 sq ft | 46.7 sq yd | Great room |
| 16 × 17 ft | 272 sq ft | 30.2 sq yd | Master bedroom |
| 13 × 17 ft | 221 sq ft | 24.6 sq yd | Bedroom with sitting area |
| 6 × 9 ft | 54 sq ft | 6.0 sq yd | Powder room, walk-in closet |
| 7 × 8 ft | 56 sq ft | 6.2 sq yd | Small bathroom, box room |
| 6 × 6 ft | 36 sq ft | 4.0 sq yd | Closet, small pantry |
Complete room dimensions reference
Searchable reference table for common dimensions. Each entry shows the square footage and typical uses for spaces that size.
The square footage formula is always the same: length × width. For irregular rooms, divide into rectangles and sum the areas.
These dimensions are nominal — actual finished rooms are typically 2-3% smaller because of wall thickness and trim.
Storage unit and closet sizes
Self-storage is sold in a small set of standard footprints, which makes it one of the few places where knowing the square footage really does tell you what fits. The table pairs each standard unit with the household it typically absorbs.
Read the height as well as the floor area. Most units are 8 ft to the ceiling, so a 10 × 10 holds 800 cubic feet if you stack properly — and the difference between stacking and not is roughly a whole unit size. Ask about ceiling height before you size up.
Closets follow the same footprints at the small end. A 5 × 5 is the walk-in for a modest bedroom; anything under about 4 ft deep is a reach-in and gets measured as depth times width, not as a room.
| Unit size | Area | Typically holds |
|---|---|---|
| 5 × 5 ft | 25 sq ft | Walk-in closet: dresser, hanging clothes, a few boxes |
| 5 × 10 ft | 50 sq ft | Contents of a small bedroom |
| 10 × 10 ft | 100 sq ft | Contents of a two-bedroom apartment |
| 10 × 15 ft | 150 sq ft | Contents of a three-bedroom house |
| 10 × 20 ft | 200 sq ft | Four-bedroom house, plus a car |
Bedroom sizes
Minimum legal bedroom (IRC code): 70 sq ft, no dimension less than 7 ft. So a 7×10 = 70 sq ft minimum.
8×10 ft (80 sq ft) — small kid's bedroom, nursery.
10×10 ft (100 sq ft) — small bedroom for child. Fits twin bed, dresser.
10×11 ft (110 sq ft) — typical secondary bedroom in starter homes.
11×12 ft (132 sq ft) — US average bedroom. Fits queen bed with nightstands, dresser.
12×12 ft (144 sq ft) — comfortable bedroom. Fits queen bed plus seating area.
12×14 ft (168 sq ft) — larger bedroom. Fits king bed with full nightstands and dresser.
14×16 ft (224 sq ft) — typical master bedroom. Fits king bed, dressers, possibly seating area.
16×20 ft (320 sq ft) — large master bedroom. Includes seating, sometimes a walk-in closet entrance.
Living room and family room sizes
12×15 ft (180 sq ft) — small living room. Fits a sofa, loveseat, coffee table, TV.
12×18 ft (216 sq ft) — typical living room in older US homes.
15×20 ft (300 sq ft) — generous living room. Fits sectional, multiple seating, generous walking space.
16×20 ft (320 sq ft) — family room or generous living room. Fits a large sectional plus accent chairs and a coffee table.
18×24 ft (432 sq ft) — great room. Open-concept living + dining area.
20×30 ft (600 sq ft) — large great room or basement family room.
Kitchen and dining sizes
Small kitchen: 10×10 ft (100 sq ft). Just enough for U-shape or galley layout.
Standard kitchen: 10×12 ft (120 sq ft) or 12×12 ft (144 sq ft).
Large kitchen with island: 12×16 ft (192 sq ft) or 14×18 ft (252 sq ft).
Open-concept kitchen and dining: 15×20 ft (300 sq ft) or larger.
Small dining room: 10×12 ft (120 sq ft) — fits table for 4-6.
Standard dining room: 12×14 ft (168 sq ft) — fits table for 6-8 with sideboard.
Large dining room: 14×18 ft (252 sq ft) — fits table for 10-12 with furniture.
Bathroom sizes
Half bath / powder room: 4×5 ft (20 sq ft) — toilet and small vanity, minimum.
Small full bath: 5×8 ft (40 sq ft) — toilet, sink, tub/shower in a row.
Standard full bath: 6×9 ft (54 sq ft) or 7×9 ft (63 sq ft).
Large full bath: 8×10 ft (80 sq ft) — separate tub and shower area possible.
Master bath: 10×12 ft (120 sq ft) — separate shower, soaking tub, double vanity.
Luxury master bath: 12×15 ft (180 sq ft) — adds water closet, makeup area, walk-in shower.
Garage and outdoor structure sizes
1-car garage: 12×20 ft (240 sq ft). Fits compact or midsize car with minimal storage.
1-car garage with storage: 14×20 ft (280 sq ft). Adds workbench, tool storage.
2-car garage: 20×20 ft (400 sq ft) or 20×24 ft (480 sq ft). Standard 2-car.
Oversized 2-car: 22×24 ft (528 sq ft). Adds workshop space.
3-car garage: 30×24 ft (720 sq ft). Fits 3 cars or 2 cars plus workshop/storage.
Shed sizes: 8×10 (80 sq ft) small storage shed. 10×12 (120 sq ft) typical backyard shed. 12×16 (192 sq ft) workshop shed.
Studio and apartment sizes
Micro-apartment: 200-350 sq ft. Bed, kitchenette, bathroom. Common in dense urban markets.
Studio apartment (typical): 400-500 sq ft. Manhattan studio average: 400 sq ft.
Studio apartment (large): 500-700 sq ft. Often called 'jr 1-bedroom.'
1-bedroom apartment: 600-900 sq ft. US average: 750 sq ft.
2-bedroom apartment: 900-1,300 sq ft.
3-bedroom apartment: 1,200-1,700 sq ft.
These are total apartment sizes including all rooms, hallways, and bathrooms.
What 'X by Y feet' actually means
When a room is described as '10x10' or '12x14', the two numbers are the inside-wall dimensions (length × width) in feet. A 10x10 room is 10 feet long and 10 feet wide, measuring from finished wall to finished wall.
Some real estate listings describe rooms by floor area only (just '120 sq ft'), without the dimensions. Without dimensions, you can't tell if it's a 10×12 (which fits a queen bed easily) or 6×20 (which is too narrow for a bed).
Always ask for or measure both dimensions, not just the square footage. Two rooms with identical square footage can be very different to live in.
Calculating square footage from feet and inches
Real rooms rarely measure to exact whole feet. To calculate square footage when dimensions include inches:
Convert inches to decimal feet: divide by 12. So 10 ft 6 in = 10.5 ft, 8 ft 3 in = 8.25 ft.
Multiply: 10.5 × 8.25 = 86.625 sq ft.
Skipping the inch conversion (just using 10 × 8) gives 80 sq ft — a 7% underestimate. Always include inches in your measurement.
The calculator above accepts feet and inches separately, then converts internally.
Pro tips
Measure to the inside walls
Don't include wall thickness in room dimensions. ANSI Z765 measures to the exterior wall surface for total house square footage, but individual rooms are inside-wall to inside-wall.
Verify with the diagonal
A 12×14 ft room should have a diagonal of √(144+196) = 18.44 ft. If your diagonal measurement disagrees, one wall is wrong.
Include closets if you want flooring in them
Closets count for flooring orders. Closets count for real estate square footage if heated and over 5 ft tall.
Round up for material orders
Always round up after applying waste factor. Coming up short kills installer schedules and dye-lot matching is unreliable on reorders.