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Paint Calculator
Estimate how much paint you need for a room based on wall size, doors, windows, number of coats, and paint coverage.
Room details
ft
ft
ft
sq ft / gallon
Estimated paint needed
Paint required
2.27 gal
You may want to round up to 3 gallons to allow for waste and touch-ups.
Total wall area448 sq ft
Paintable area397 sq ft
Area with coats794 sq ft
How much paint do I need?
Paint coverage varies by product and surface, but many interior paints cover around 350 to 400 square feet per gallon. This calculator estimates your wall area, subtracts approximate space for doors and windows, and multiplies the remaining area by the number of coats.
Typical assumptions
This calculator assumes an average door area of 21 square feet and an average window area of 15 square feet. For the most accurate result, always check the coverage listed on your paint container.