Paint Calculator: Estimate How Much Paint You Need for Your Room

Calculate Your Paint Needs

Typical coverage is 300-400 sq ft per gallon.
Enter the combined square footage of areas you won't paint.

Tired of guessing how much paint to buy? Our Paint Calculator takes the guesswork out of your next painting project. Simply input your room's dimensions, wall height, and desired coats to get an accurate estimate of paint gallons needed. Perfect for DIY enthusiasts and professionals alike!

Formula:

The formula for calculating paint needed is:

  • Total Wall Area = (2 × (Room Length + Room Width)) × Wall Height
  • Paintable Area = Total Wall Area - Total Area of Windows/Doors
  • Required Paint (Gallons) = (Paintable Area × Number of Coats) ÷ Paint Coverage per Gallon

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