How much paint for a 12×12 room?

A 12×12 ft room with 8 ft ceilings has 48 ft perimeter × 8 ft = 384 sq ft of walls before openings. With 2 coats at 350 sq ft/gal, plan about 2–3 gallons depending on doors and windows.

How many gallons of paint for a room?

Paintable wall area = perimeter × height minus doors (~21 ft² each) and windows (~15 ft² each). Gallons = area × coats ÷ coverage (default 350 ft²/gal), rounded up.

How many coats should I plan for?

Two coats is standard for walls. One coat may suffice over similar color; new color or bare drywall often needs two. Adjust the coats field in the calculator.

12×12 Room Paint Calculator

A standard 12×12 ft bedroom has 48 ft perimeter and 8 ft walls (384 sq ft before doors/windows). Use the ceiling field for 144 sq ft if you are painting the ceiling too.

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Rooms

Room 1

Perimeter (ft)

Wall height (ft)

Doors

Windows

Ceiling area (ft², optional)

Coats (Coverage)

Coverage (ft²/gal)

Price per gallon ($, optional)

1 coat at 250 ft²/gal on bare or patched walls

Adds 20% waste for overspray

Result

4 gallons

624 ft² paintable · 2 coats · 350 ft²/gal

Per room

Room 1: 624 ft² → 4 gal

624 ft² × 2 ÷ 350 = 4 gallons

350 ft²/gal coverage assumes mid-range interior latex with two coats — verify on your paint can label. Full methodology

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A standard 12×12 ft bedroom has 48 ft perimeter and 8 ft walls (384 sq ft before doors/windows). Use the ceiling field for 144 sq ft if you are painting the ceiling too.

Frequently asked questions

How much paint for a 12×12 room?: A 12×12 ft room with 8 ft ceilings has 48 ft perimeter × 8 ft = 384 sq ft of walls before openings. With 2 coats at 350 sq ft/gal, plan about 2–3 gallons depending on doors and windows.
How many gallons of paint for a room?: Paintable wall area = perimeter × height minus doors (~21 ft² each) and windows (~15 ft² each). Gallons = area × coats ÷ coverage (default 350 ft²/gal), rounded up.
How many coats should I plan for?: Two coats is standard for walls. One coat may suffice over similar color; new color or bare drywall often needs two. Adjust the coats field in the calculator.

Frequently asked questions

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