Room Size Calculator

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).

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.

5×5 ft (25 sq ft) — small storage unit, walk-in closet for a small bedroom. Fits a small dresser, hanging clothes, and a few boxes.

5×10 ft (50 sq ft) — medium storage unit. Holds the contents of a small bedroom (bed, dresser, nightstands) or a few rooms of furniture.

10×10 ft (100 sq ft) — standard storage unit. Holds the contents of a 2-bedroom apartment. Sometimes used as a small bedroom.

10×15 ft (150 sq ft) — large storage unit. Holds the contents of a 3-bedroom house with major furniture.

10×20 ft (200 sq ft) — extra-large storage. Holds the contents of a 4-bedroom house, plus a car.

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.

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.

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.

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.

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.

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.

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.

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.