Paint Calculator

Paint Calculator

Calculate how many gallons of paint you need for a room. Enter wall dimensions, subtract doors and windows, and choose your number of coats.






Wall 1×
Wall 2×
Wall 3×
Wall 4×


Paint Coverage Guide

Paint Type Coverage per Gallon
Standard latex / acrylic 350–400 sq ft
Premium thick paint 300–350 sq ft
Primer 250–350 sq ft
Textured surfaces 200–300 sq ft

Tips for Accurate Estimates

  • Always add 10% extra for touch-ups and waste
  • Dark colors over light often need 3 coats
  • New drywall always needs primer first
  • Standard door = ~20 sq ft, standard window = ~15 sq ft