How much paint do I need for a 12x12 room?

With 8 ft ceilings that's about 384 sq ft of wall, so roughly 2 gallons for two coats after subtracting a door and window.

Does dark paint need more coats?

Often yes. Deep colors and drastic color changes can need three coats, so add a coat when in doubt.

This tool covers walls. Calculate the ceiling separately using its length × width as the area.

Paint Calculator

Paint needed equals wall area divided by 350 square feet per gallon, times the number of coats. One gallon covers about 350 sq ft in one coat.

Wall perimeter(ft)

Ceiling height(ft)

Coats

Doors + windows

Your result

Paint needed

1.7 gal

Paintable wall area292 sq ft

Buy (rounded up)2 gal

Turn length and width into square feet, square yards and square meters.

Wallpaper rolls a room needs, accounting for pattern waste.

Total material cost from quantity, unit price and waste.

Room-by-room paint jobs scoped from a quick video.

Whole-home exteriors scoped from walk-around photos.

EstimateVision reads the scope from photos, video and voice, prices it for your area, and sends a signed proposal on the spot.