Paint Calculator
Calculate how much paint you need for your room. Enter dimensions, doors, and windows for an accurate estimate.
Paint Calculator
Calculate how much paint you need for your room
Most paints cover 300-400 sq ft per gallon. Check your paint can for specific coverage.
Formula
Paint Needed = (Wall Area - Doors - Windows) x Coats / CoverageWall Area = 2 x (Length + Width) x Height. Standard door = 20 sq ft, window = 15 sq ft.
How to Use
- 1Measure your room — Measure length, width, and wall height in feet.
- 2Count doors and windows — These areas will be subtracted from total wall area.
- 3Choose number of coats — Most projects require 2 coats for best coverage.
- 4Check paint coverage — Most paints cover 300-400 sq ft per gallon.
- 5Get your results — See how many gallons you need to purchase.
Frequently Asked Questions
How much paint do I need for a 12x12 room?
For a 12x12 room with 8-foot ceilings, you need about 334 sq ft of coverage after subtracting doors/windows. With 2 coats, you'll need approximately 2 gallons.
How many square feet does a gallon cover?
Most interior paints cover 300-400 sq ft per gallon. Premium paints may cover up to 400 sq ft, while budget paints might only cover 250-300 sq ft.
Should I buy extra paint?
Yes, buy 10-15% extra for touch-ups and to account for textured walls or porous surfaces.
How many coats of paint do I need?
Most projects require 2 coats. You may need 3 coats when painting over dark colors with light paint.