Free project calculator

Paint Calculator

Estimate gallons of paint, total cost, and waste allowance for interior and exterior painting projects.

How much paint do I need?

Enter the length, width, and wall height of your room to estimate how many gallons of paint you'll need. Adjust the paint coverage if your manufacturer lists a different coverage rate.

Typical paint coverage

  • Flat paint: 350–400 sq ft per gallon
  • Eggshell: 350 sq ft per gallon
  • Satin: 350 sq ft per gallon
  • Semi-gloss: 300–350 sq ft per gallon