How Much Paint for a 12x12 Room? [Calculator + Guide]
Quick Answer: 1-2 Gallons
A standard 12x12 room with 8-foot ceilings typically needs 1.5 gallons for 2 coats (walls only)
Exact Calculation for 12x12 Room
How We Calculate This
- Measure all four walls: (12+12+12+12) × 8 = 384 sq ft
- Subtract doors and windows: ~30 sq ft = 354 sq ft
- Divide by coverage rate: 354 ÷ 350 = 1.01 gallons per coat
- Multiply by coats needed: 1.01 × 2 = 2.02 gallons total
Pro tip: Always buy an extra quart for touch-ups
What Changes This Amount?
- •Ceiling height: 9-10 ft ceilings need 2-2.5 gallons
- •Paint type: Flat paint covers more than high-gloss
- •Wall texture: Rough walls absorb 20% more paint
- •Color change: Dark to light needs 3 coats (3 gallons)
Get Your Exact Amount
Every room is different. Use our free calculator to get a precise estimate for YOUR 12x12 room
Related Resources
Frequently Asked Questions
How much paint is needed for a 12x12 room?
For a standard 12x12 room with 8-foot ceilings, you'll need approximately 1.5 to 2 gallons of paint for 2 coats on the walls. This covers about 384 square feet of wall area (after subtracting doors and windows). If you're also painting the ceiling, add an additional 1 gallon for 2 coats.
How much paint for a 12x12 room?
A 12x12 room requires 1.5-2 gallons for 2 coats on walls only. The calculation: (12+12+12+12) × 8 feet = 384 sq ft of wall area. After subtracting one door (20 sq ft) and one window (15 sq ft), you have 349 sq ft. At 350-400 sq ft per gallon coverage, you need ~1 gallon per coat, or 2 gallons for 2 coats.
How many gallons of paint for a 12x12 room?
You'll need 1.5 to 2 gallons of paint for a 12x12 room with standard 8-foot ceilings. This assumes 2 coats of paint on the walls. For high-quality coverage, we recommend buying 2 full gallons to ensure you have enough paint and some left over for touch-ups.
Do I need to paint the ceiling too?
A 12x12 ceiling adds 144 square feet, requiring an additional 0.5 gallons per coat (1 gallon total for 2 coats). So if you're painting both walls and ceiling, you'll need approximately 2.5-3 gallons total for a complete paint job.
Should I buy 1 gallon or 2 gallons for a 12x12 room?
Buy 2 gallons if doing 2 coats on walls. It's better to have extra than run out mid-project. Having leftover paint is also useful for future touch-ups and repairs. Most paint stores will accept returns of unopened gallons if you overestimate.
What if my 12x12 room has high ceilings?
For 9-foot ceilings, add approximately 0.5 gallons. For 10-foot ceilings, add 1 gallon. The formula: (ceiling height - 8) × perimeter ÷ coverage rate. A 12x12 room with 10-foot ceilings would need approximately 2.5-3 gallons for 2 coats.
What if my room has different dimensions?
Use our free paint calculator to enter your exact room dimensions (length, width, height) and get a precise calculation. Our calculator accounts for doors, windows, and multiple coats automatically.