How much flooring do I need for a 15x18 room?

Buy about 297 sq ft: the 270 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 15 boxes. Diagonal or herringbone layouts need 15–20% extra instead.

How much paint do I need for a 15x18 room?

With 8 ft ceilings, one door and one window, the walls are about 492 sq ft. Two coats at 350 sq ft per gallon is 2.8 gallons, so buy 3. Painting the ceiling as well brings it to 4.4 gallons.

How many square meters is 15 by 18 feet?

25.08 m². The room is 4.57 m by 5.49 m.

How many sheets of drywall for a 15x18 room?

About 27 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 15x18 Room?

A 15x18 room is 270 square feet (25.1 m²). Flooring with waste, paint, drywall and baseboard for a 15x18 room.

Updated October 12, 2026 · FloorFigures

Short answer

A 15x18 room is 270 square feet (15 × 18), or 25.1 m² and 30 square yards. Its perimeter is 66 ft. Flooring with 10% waste comes to about 297 sq ft.

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

Materials for a 15x18 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	270 sq ft	Wall to wall
Flooring to buy	297 sq ft (15 boxes)	10% waste, 20 sq ft boxes
Carpet	41.3 sq yd	12 ft roll, 1 seam
Wall area	492 sq ft	8 ft walls, less a door and a window
Paint, walls	2.8 gal (buy 3)	2 coats, 350 sq ft per gallon
Paint, walls and ceiling	4.4 gal	2 coats
Drywall	27 sheets	4x8 sheets, walls and ceiling, 10% waste
Baseboard	63 ft	Perimeter less a 3 ft door

What a 15x18 room is used for

Rooms this size are usually living rooms, family rooms, large primary suites or open kitchens. A queen bed (60" × 80") takes up about 33 sq ft, or 12% of the floor.

15x18 in other units

Unit	Value
Square feet	270
Square meters	25.08
Square yards	30
Square inches	38,880
Acres	0.0062
Dimensions in meters	4.57 × 5.49 m

Rooms close to 15x18

Room	Square feet	Square meters
12x20	240	22.3
15x16	240	22.3
14x18	252	23.4
16x16	256	23.8
14x20	280	26
12x24	288	26.8
16x18	288	26.8
15x20	300	27.9

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 15x18 room?: A 15 by 18 foot room is 270 square feet: 15 × 18 = 270. That's 25.1 square meters or 30 square yards.
How much flooring do I need for a 15x18 room?: Buy about 297 sq ft: the 270 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 15 boxes. Diagonal or herringbone layouts need 15–20% extra instead.
How much paint do I need for a 15x18 room?: With 8 ft ceilings, one door and one window, the walls are about 492 sq ft. Two coats at 350 sq ft per gallon is 2.8 gallons, so buy 3. Painting the ceiling as well brings it to 4.4 gallons.
How many square meters is 15 by 18 feet?: 25.08 m². The room is 4.57 m by 5.49 m.
How many sheets of drywall for a 15x18 room?: About 27 sheets of 4x8 drywall for the walls and ceiling with 8 ft walls, one door and one window, including 10% waste.