How much flooring do I need for a 15x20 room?

Buy about 330 sq ft: the 300 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 17 boxes. Diagonal or herringbone layouts need 15–20% extra instead.

How much paint do I need for a 15x20 room?

With 8 ft ceilings, one door and one window, the walls are about 524 sq ft. Two coats at 350 sq ft per gallon is 3 gallons, so buy 3. Painting the ceiling as well brings it to 4.7 gallons.

How many square meters is 15 by 20 feet?

27.87 m². The room is 4.57 m by 6.1 m.

How many sheets of drywall for a 15x20 room?

About 29 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 15x20 Room?

A 15x20 room is 300 square feet (27.9 m²). Flooring with waste, paint, drywall and baseboard for a 15x20 room.

Updated October 12, 2026 · FloorFigures

Short answer

A 15x20 room is 300 square feet (15 × 20), or 27.9 m² and 33.3 square yards. Its perimeter is 70 ft. Flooring with 10% waste comes to about 330 sq ft.

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

Materials for a 15x20 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	300 sq ft	Wall to wall
Flooring to buy	330 sq ft (17 boxes)	10% waste, 20 sq ft boxes
Carpet	41.3 sq yd	12 ft roll, 1 seam
Wall area	524 sq ft	8 ft walls, less a door and a window
Paint, walls	3 gal (buy 3)	2 coats, 350 sq ft per gallon
Paint, walls and ceiling	4.7 gal	2 coats
Drywall	29 sheets	4x8 sheets, walls and ceiling, 10% waste
Baseboard	67 ft	Perimeter less a 3 ft door

What a 15x20 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 11% of the floor.

15x20 in other units

Unit	Value
Square feet	300
Square meters	27.87
Square yards	33.33
Square inches	43,200
Acres	0.0069
Dimensions in meters	4.57 × 6.1 m

Rooms close to 15x20

Room	Square feet	Square meters
14x18	252	23.4
16x16	256	23.8
15x18	270	25.1
14x20	280	26
12x24	288	26.8
16x18	288	26.8
16x20	320	29.7
18x18	324	30.1

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 15x20 room?: A 15 by 20 foot room is 300 square feet: 15 × 20 = 300. That's 27.9 square meters or 33.3 square yards.
How much flooring do I need for a 15x20 room?: Buy about 330 sq ft: the 300 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 17 boxes. Diagonal or herringbone layouts need 15–20% extra instead.
How much paint do I need for a 15x20 room?: With 8 ft ceilings, one door and one window, the walls are about 524 sq ft. Two coats at 350 sq ft per gallon is 3 gallons, so buy 3. Painting the ceiling as well brings it to 4.7 gallons.
How many square meters is 15 by 20 feet?: 27.87 m². The room is 4.57 m by 6.1 m.
How many sheets of drywall for a 15x20 room?: About 29 sheets of 4x8 drywall for the walls and ceiling with 8 ft walls, one door and one window, including 10% waste.