How much flooring do I need for a 12x18 room?

Buy about 238 sq ft: the 216 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 12 boxes. Diagonal or herringbone layouts need 15–20% extra instead.

How much paint do I need for a 12x18 room?

With 8 ft ceilings, one door and one window, the walls are about 444 sq ft. Two coats at 350 sq ft per gallon is 2.5 gallons, so buy 3. Painting the ceiling as well brings it to 3.8 gallons.

How many square meters is 12 by 18 feet?

20.07 m². The room is 3.66 m by 5.49 m.

How many sheets of drywall for a 12x18 room?

About 23 sheets of 4x8 drywall for the walls and ceiling with 8 ft walls, one door and one window, including 10% waste.

Room sizes

How Many Square Feet Is a 12x18 Room?

A 12x18 room is 216 square feet (20.1 m²). Flooring with waste, paint, drywall and baseboard for a 12x18 room.

Updated October 12, 2026 · FloorFigures

Short answer

A 12x18 room is 216 square feet (12 × 18), or 20.1 m² and 24 square yards. Its perimeter is 60 ft. Flooring with 10% waste comes to about 238 sq ft.

Drawn to scale. Each grid square is 1 ft × 1 ft.

Materials for a 12x18 room

Estimates for a plain rectangular room with 8 ft ceilings, one door and one window. Adjust for your own room with the flooring, paint and drywall calculators.

Item	Quantity	Assumes
Floor area	216 sq ft	Wall to wall
Flooring to buy	238 sq ft (12 boxes)	10% waste, 20 sq ft boxes
Carpet	24.7 sq yd	12 ft roll, no seams
Wall area	444 sq ft	8 ft walls, less a door and a window
Paint, walls	2.5 gal (buy 3)	2 coats, 350 sq ft per gallon
Paint, walls and ceiling	3.8 gal	2 coats
Drywall	23 sheets	4x8 sheets, walls and ceiling, 10% waste
Baseboard	57 ft	Perimeter less a 3 ft door

What a 12x18 room is used for

Rooms this size are usually primary bedrooms, kitchens, dining rooms or family rooms. A queen bed (60" × 80") takes up about 33 sq ft, or 15% of the floor.

12x18 in other units

Unit	Value
Square feet	216
Square meters	20.07
Square yards	24
Square inches	31,104
Acres	0.005
Dimensions in meters	3.66 × 5.49 m

Rooms close to 12x18

Room	Square feet	Square meters
12x16	192	17.8
13x15	195	18.1
14x14	196	18.2
10x20	200	18.6
13x16	208	19.3
14x15	210	19.5
14x16	224	20.8
15x15	225	20.9

Room not a simple rectangle? Use the square footage calculator for L-shapes and angled walls, or split it into rectangles.

Questions

How many square feet is a 12x18 room?: A 12 by 18 foot room is 216 square feet: 12 × 18 = 216. That's 20.1 square meters or 24 square yards.
How much flooring do I need for a 12x18 room?: Buy about 238 sq ft: the 216 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 12 boxes. Diagonal or herringbone layouts need 15–20% extra instead.
How much paint do I need for a 12x18 room?: With 8 ft ceilings, one door and one window, the walls are about 444 sq ft. Two coats at 350 sq ft per gallon is 2.5 gallons, so buy 3. Painting the ceiling as well brings it to 3.8 gallons.
How many square meters is 12 by 18 feet?: 20.07 m². The room is 3.66 m by 5.49 m.
How many sheets of drywall for a 12x18 room?: About 23 sheets of 4x8 drywall for the walls and ceiling with 8 ft walls, one door and one window, including 10% waste.