Paint Calculator
Estimate how many gallons of paint you need for any room. Calculate wall area, subtract doors and windows, and get the exact amount of paint required.
Wall Dimensions
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Paint Coverage Guide
Our paint calculator uses 350 square feet per gallon as a conservative estimate. Here are some factors that affect paint coverage:
- Standard door: approximately 20 sq ft each
- Standard window: approximately 15 sq ft each
- Textured walls (popcorn, knockdown) use 10-20% more paint
- Dark colors and dramatic color changes may need 3 coats
- High-quality paint often provides better coverage than budget brands
Frequently Asked Questions
How much paint do I need for a 12x12 room?
A 12x12 room with 8-foot ceilings has approximately 384 square feet of wall area. After subtracting doors and windows, you'll need about 1 gallon of paint per coat. For two coats, buy 2 gallons.
How many square feet does a gallon of paint cover?
One gallon of paint typically covers 350-400 square feet. This varies by paint quality, surface texture, and color. Darker colors and textured surfaces may require more paint.
Should I use primer before painting?
Yes, primer is recommended when painting over dark colors, new drywall, stained surfaces, or when making a dramatic color change. Primer improves adhesion and reduces the number of paint coats needed.
How many coats of paint should I apply?
Two coats of paint are standard for most interior painting projects. One coat may suffice for repainting the same color, but two coats ensure even coverage and better durability.