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How Many Square Feet Per Gallon Of Paint? (2026 Guide)
Standing in the paint aisle doing math is no fun for DIYers. Buy too much and you've wasted money on cans you'll never open. Buy too little and you're back in the car for a second trip. Knowing how many square feet per gallon of paint you actually get takes the guesswork out of it. Below, you'll get the simple answer, plus how to calculate your project and buy the right amount. And if you paint for a living, a pay stub generator keeps your income on record.
Key Takeaways
- One gallon of paint covers about 350 to 400 square feet on a single coat.
- Plan for two coats on most walls, which roughly halves that coverage.
- A 12 by 10 room with 8-foot ceilings usually needs about 2 gallons.
- Surface texture and porosity affect coverage more than color does.
- Round up to a quart, not a whole gallon, to save money and avoid waste.
How Many Square Feet Per Gallon of Paint Do You Get?
One gallon of paint covers about 350 to 400 square feet with a single coat, roughly the wall space of an average bedroom. Most projects need two coats, so plan for about 175 to 200 square feet of finished coverage per gallon to be safe.
Why the range? Coverage depends on the surface, your roller, and how thick you apply the paint. Smooth, previously painted walls reach the higher end near 400. Bare drywall or rough textures pull you down toward 350 or less. When in doubt, use a 350 square foot coverage rate as your safe number.
How to Calculate How Much Paint You Need
Figuring your square footage is simple. Measure each wall's length and height, multiply them, and add the walls together. Then subtract about 15 square feet per window and 20 per door.
Here's a real example. A 12 by 10 bedroom with 8-foot ceilings, two windows, and one door has about 350 square feet of wall. Subtract 50 for the openings and you're at 300 square feet. Two coats doubles that to 600, which means about 2 gallons.
Painting the ceiling too? Multiply length by width and plan for two coats of flat ceiling paint. A free paint calculator app can do the math for you.
What Affects How Many Square Feet Per Gallon of Paint You Get
A few things decide where your gallon lands between 350 and 400 square feet:
- Number of coats: Two coats is standard for an even finish, which is why coverage effectively halves.
- Surface porosity: The biggest variable, bigger than color. Bare drywall soaks up two to three times more paint than a sealed wall, so priming first, ideally with a tinted primer, saves money.
- Texture: Textured walls have more surface area, so they drink more paint than smooth ones.
- Color change: Big shifts, like dark to light, often need an extra coat.
- Paint quality: Premium paints from brands like BEHR often cover in one or two coats, while bargain paint can need three.
How Much Paint Do You Need for Each Room?
For two coats, a bathroom usually needs about 1 gallon and a standard bedroom about 2 gallons. A living room or kitchen takes 2 to 3 gallons, and large open-plan spaces can take 4 or more. When you land between sizes, round up to the next quart.
| Room | Paint for two coats |
|---|---|
| Bathroom | About 1 gallon |
| Bedroom | About 2 gallons |
| Living room or kitchen | 2 to 3 gallons |
| Open-plan space | 4 or more gallons |
Tips to Buy the Right Amount of Paint
A couple of habits save real money. Round up to a quart, not a whole gallon: if you need 1.2 gallons, buy one gallon plus a quart instead of two. Interior paint runs about $25 to $35 a gallon for economy and $60 to $90 for premium in 2026. If painting is your side gig, it helps to know how to report your freelance income and show proof of income when a client or landlord asks.
Budgeting Your Painting Project
Paint is one line in a bigger budget. It helps to calculate your monthly income before you start, and if you paint on the side, tracking your 1099 tax deductions saves money at tax time.
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Conclusion
Bottom line: one gallon of paint covers about 350 to 400 square feet per coat, and most walls need two. Measure your space, subtract the windows and doors, and round up to the nearest quart. And if painting is your trade, you can create a professional pay stub in under two minutes whenever you need proof of income.
