How much flooring do I need for a 20x30 room?

Buy about 660 sq ft: the 600 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 33 boxes. Diagonal or herringbone layouts need 15–20% extra instead.

How much paint do I need for a 20x30 room?

With 8 ft ceilings, one door and one window, the walls are about 764 sq ft. Two coats at 350 sq ft per gallon is 4.4 gallons, so buy 5. Painting the ceiling as well brings it to 7.8 gallons.

How many square meters is 20 by 30 feet?

55.74 m². The room is 6.1 m by 9.14 m.

How many sheets of drywall for a 20x30 room?

About 47 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 20x30 Room?

A 20x30 room is 600 square feet (55.7 m²). Flooring with waste, paint, drywall and baseboard for a 20x30 room.

Updated October 12, 2026 · FloorFigures

Short answer

A 20x30 room is 600 square feet (20 × 30), or 55.7 m² and 66.7 square yards. Its perimeter is 100 ft. Flooring with 10% waste comes to about 660 sq ft.

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

Materials for a 20x30 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	600 sq ft	Wall to wall
Flooring to buy	660 sq ft (33 boxes)	10% waste, 20 sq ft boxes
Carpet	81.3 sq yd	12 ft roll, 1 seam
Wall area	764 sq ft	8 ft walls, less a door and a window
Paint, walls	4.4 gal (buy 5)	2 coats, 350 sq ft per gallon
Paint, walls and ceiling	7.8 gal	2 coats
Drywall	47 sheets	4x8 sheets, walls and ceiling, 10% waste
Baseboard	97 ft	Perimeter less a 3 ft door

What a 20x30 room is used for

Rooms this size are usually garages (a two-car garage is commonly 20–24 ft on each side), great rooms, basements or open-plan living areas. A queen bed (60" × 80") takes up about 33 sq ft, or 6% of the floor.

20x30 in other units

Unit	Value
Square feet	600
Square meters	55.74
Square yards	66.67
Square inches	86,400
Acres	0.0138
Dimensions in meters	6.1 × 9.14 m

Rooms close to 20x30

Room	Square feet	Square meters
20x20	400	37.2
18x24	432	40.1
20x22	440	40.9
20x24	480	44.6
22x22	484	45
22x24	528	49.1
24x24	576	53.5
24x30	720	66.9

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 20x30 room?: A 20 by 30 foot room is 600 square feet: 20 × 30 = 600. That's 55.7 square meters or 66.7 square yards.
How much flooring do I need for a 20x30 room?: Buy about 660 sq ft: the 600 sq ft floor plus 10% for cuts and waste. With boxes that cover 20 sq ft, that's 33 boxes. Diagonal or herringbone layouts need 15–20% extra instead.
How much paint do I need for a 20x30 room?: With 8 ft ceilings, one door and one window, the walls are about 764 sq ft. Two coats at 350 sq ft per gallon is 4.4 gallons, so buy 5. Painting the ceiling as well brings it to 7.8 gallons.
How many square meters is 20 by 30 feet?: 55.74 m². The room is 6.1 m by 9.14 m.
How many sheets of drywall for a 20x30 room?: About 47 sheets of 4x8 drywall for the walls and ceiling with 8 ft walls, one door and one window, including 10% waste.