✓ 350 Sq Ft / Gallon Coverage Standard
Paint & Primer Coverage Calculator
Calculate gallons, quarts, and primer required for interior walls and ceilings with door/window deductions.
Room Dimensions & Openings
Paint Order Estimate
Paint (Gallons) 3 Gallons Top Coat (2 coats)
Primer (Gallons) 2 Gallons Base Coat
Net Wall Paintable Area: 396 sq ft
Total Paint Coverage Volume: 792 sq ft
Frequently Asked Questions
How much area does one gallon of paint cover?
One standard gallon of quality interior latex paint covers approximately 350 to 400 square feet with one coat. For rough or textured surfaces (like stucco or bare masonry), coverage drops to 250 to 300 square feet per gallon.
Do I really need 2 coats of paint?
Yes, applying 2 coats of paint provides full color saturation, hides substrate imperfections, and creates a durable, washable film that lasts 2 to 3 times longer than a single thin coat.
How do you calculate paint needed for a room?
Measure the perimeter of the room (Length + Width) × 2, multiply by the ceiling height to find gross wall area, subtract 21 sq ft per door and 15 sq ft per window, multiply by number of coats, and divide by 350 sq ft per gallon.