Paint Calculator
Estimate how much paint you need to paint a room.
Calculator Inputs
Results
Total Area to Paint
334.00 sq ft
Gallons of Paint Needed
2 Gallons
Rounded up to the next full gallon.
How the Paint Calculator Works
This tool calculates the total wall area of your room and subtracts the approximate area for standard doors and windows. It then multiplies this by the number of coats you plan to apply and divides by the paint's coverage per gallon to tell you how many gallons of paint to buy.
Frequently Asked Questions
What is typical paint coverage?
A standard gallon of interior paint covers about 350-400 square feet with one coat. However, this can vary based on the paint quality, surface texture, and application method.
Do I need to subtract for doors and windows?
Yes, subtracting the area of doors and windows gives you a more accurate estimate of the wall surface you need to paint. This calculator uses standard sizes (20 sq ft for a door, 15 sq ft for a window).
Should I buy extra paint?
It's always a good idea to have some extra paint for touch-ups. Buying slightly more than the calculated amount, or at least keeping the paint color information, is recommended.