Easily calculate how much paint you need for any room size. Enter your room dimensions and get an instant estimate in gallons or liters.
Enter your room measurements to calculate paint needed
Measure from floor to ceiling, including any crown molding
Account for windows and doors (already subtracted in calculation)
Add 10-20% extra paint for touch-ups and coverage variations
Coverage may vary by paint brand, texture, and application method
Dark colors may require an additional coat or primer
1 gallon typically covers 350-400 square feet with one coat
For a 12x12 room with 8-foot walls, you'll need about 2 gallons of paint for two coats on the walls. If painting the ceiling, add approximately 0.5 gallons for a total of 2.5 gallons.
To calculate paint needed, measure your room's length, width, and height. Calculate the wall area (perimeter × height), subtract window and door areas, add ceiling area if needed, then divide by paint coverage (typically 350 sq ft per gallon). Multiply by the number of coats needed.
A typical 12x12 room with 8-foot ceilings requires about 2 gallons for two coats on walls. Smaller rooms (10x10) need about 1.5 gallons, while larger rooms (15x15) may need 3-4 gallons. Always add 10-20% extra for touch-ups.
One gallon of paint typically covers 350-400 square feet with one coat. Coverage can vary based on paint type, surface texture, and application method. Higher quality paints often provide better coverage.
Yes, if you're painting the ceiling, include it in your calculation. Ceiling area = length × width. Typically, a 12x12 room ceiling adds about 0.5 gallons for two coats. Ceilings often require a different type of paint (ceiling paint) which is specifically designed for overhead surfaces.