Paint calculator: how much paint a room takes (gallons and hours)
Free paint calculator from a painting contractor: room size, doors, windows, coats and the ceiling give the gallons to buy and the painter-hours. English and Spanish, no email.
How much paint a room takes
From a painter who has priced rooms for 14 years: walls, doors and windows out, two coats, about 350 square feet a gallon.
Paint to buy
3gallons
- Area to paint365 sq ft
- Labor, one painter4.9 hours
- That is about0.6 8-hour days
A door counts as 21 sq ft and a window as 15. Rounded up to whole gallons; add more for a big color change or a rough surface.
Price the room with those hours and gallons (paint at about $45 a gallon; you can change it there). Send them to Price a job →
How the number is made
- Walls: 2 × (length + width) × height. Take out about 21 sq ft for each door and 15 for each window; add length × width for the ceiling.
- Gallons: area × coats ÷ what a gallon covers (about 350 sq ft on smooth walls), rounded up.
- Hours: area × coats ÷ what one painter rolls in an hour.
Questions people ask
How many square feet does a gallon of paint cover?
About 350 to 400 square feet on smooth, primed walls; the can says what that paint covers. Rough or porous surfaces take more.
How many coats do I need?
Two coats for a solid, even color, and a primer coat first for new drywall, stains or a big color change.
How long does it take to paint a room?
It depends on the prep, the trim and the painter. This tool uses what one painter rolls in an hour on the walls; set it to your own crew’s pace.
Your numbers, on every quote.
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