How Much Does a Gallon of Paint Cover?

Quick answer: A gallon of paint covers about 350 to 400 square feet per coat on a smooth, primed surface. In the real world plan on 350 square feet, and less for textured walls, bare wood, brick or stucco. Most jobs need two coats, so one gallon really covers about 175 square feet of finished wall.

The 350 to 400 number is printed on almost every can, but it is a best-case figure measured on a perfect lab surface. Your walls are not a lab. This guide explains what a gallon truly covers across every common surface, sheen and paint type, why two coats halve that figure, and how to read the coverage claim on the can so you buy the right amount the first time. When you want the math done for you, our free painting calculator turns your measurements into gallons in seconds, and the paint coverage calculator does the per-gallon arithmetic on its own.

The 350 to 400 square feet rule, and why real life is lower

Paint manufacturers test coverage on smooth, sealed, non-porous panels with a roller under ideal conditions. That gives the 350 to 400 square feet per gallon you see on the label. On an actual wall, three things eat into it: surface texture adds hidden area, porous or bare spots drink the first coat, and application waste (drips, the tray, the roller you toss) is real. For planning, use 350 square feet per gallon for interior walls and 300 for exterior surfaces. Those two numbers will keep you from running short on the overwhelming majority of jobs.

Master coverage reference chart

This is the table to bookmark. It shows realistic single-coat coverage per gallon for the products and surfaces you are most likely to paint. Divide your square footage by the figure, then multiply by your number of coats.

Product or surface	Coverage per gallon (1 coat)	Notes
Interior wall paint, smooth drywall	350 to 400 sq ft	The standard figure; plan on 350
Ceiling paint, flat	350 to 400 sq ft	Flat hides flaws, covers well
Trim and door enamel	350 to 400 sq ft	Thin coats, but small total area
Primer (interior)	200 to 300 sq ft	Lower than paint; built to seal, not cover
Exterior paint, smooth siding	300 to 350 sq ft	Use 300 for planning
Exterior paint, rough or shingle	250 to 300 sq ft	Texture adds surface area
Stucco	150 to 250 sq ft	Porous and deeply textured
Brick and masonry	100 to 200 sq ft	Thirsty; prime or use block filler first
Bare or new wood	200 to 300 sq ft	First coat soaks in; prime to recover coverage
Concrete or floor paint	200 to 400 sq ft	Smooth troweled is high, rough is low

Notice how wide the range is. A gallon that stretches to 400 square feet on smooth primed drywall covers barely 100 on raw brick. The surface, not the paint, decides most of it.

How sheen changes coverage

Sheen is the gloss level of the paint, and it quietly shifts how far a gallon goes. Flatter paints carry more pigment and fewer resins, so they hide and cover slightly better per coat. Glossier paints carry more resin for shine and durability, spread thinner, and cover a touch less. The difference is not huge, but on a big job it is real.

Sheen	Relative coverage	Best for
Flat or matte	Highest, near 400 sq ft	Ceilings, low-traffic walls
Eggshell	High, around 375 sq ft	Living rooms, bedrooms
Satin	Standard, around 350 sq ft	Hallways, kids’ rooms, kitchens
Semi-gloss	Slightly lower, 325 to 350	Trim, doors, bathrooms
High gloss	Lowest, 300 to 350	Trim accents, cabinetry

The practical takeaway: do not assume a glossy trim enamel covers as far as a flat ceiling paint. Buy trim by its own coverage figure.

Coverage by paint type and product

Different products are built for different jobs, and their coverage reflects that. Knowing where each one lands stops you from buying primer like it were wall paint, which is the most common quantity mistake.

Wall paint

Standard interior latex covers 350 to 400 square feet per gallon. This is the benchmark every other figure is compared against.

Ceiling paint

Flat ceiling paint covers about as well as wall paint, 350 to 400 square feet, and it is formulated to spatter less and hide imperfections. See https://paintpricing.com/how-much-paint-for-a-ceiling/ for room-by-room ceiling amounts.

Trim and door enamel

Enamels spread thin to self-level, but trim has little surface area, so a single quart often does a whole room. For exact figures see https://paintpricing.com/how-much-paint-for-trim-and-baseboards/ and https://paintpricing.com/how-much-paint-for-a-door/.

Primer

This is the one that surprises people. Primer covers only 200 to 300 square feet per gallon, well below paint, because it is built to seal and bond rather than build a film. Always buy primer by its own lower figure. Our dedicated guide at https://paintpricing.com/how-much-primer-do-i-need/ breaks down primer quantity by job.

Exterior and masonry paint

Exterior paint covers 300 to 350 square feet on smooth siding and far less on brick, stucco and rough wood. Masonry surfaces can drop a gallon to 100 to 200 square feet, which is why exterior estimates always run higher than interior ones. See https://paintpricing.com/how-much-paint-house-exterior/ for whole-house exterior amounts.

Surface texture is the biggest single factor

Two walls of identical dimensions can need wildly different amounts of paint if one is smooth and one is textured, because texture multiplies the actual surface area the paint has to coat. Here is roughly how much extra each common texture demands.

Surface	Coverage per gallon	vs smooth drywall
Smooth drywall (primed)	350 to 400 sq ft	Baseline
Orange peel or light texture	325 to 350 sq ft	About 10 percent more paint
Knockdown or heavy texture	275 to 325 sq ft	About 15 to 20 percent more
Popcorn ceiling	250 to 300 sq ft	Up to 25 percent more
Stucco	150 to 250 sq ft	30 to 50 percent more
Brick or block	100 to 200 sq ft	Can nearly double paint use
Bare wood	200 to 300 sq ft (first coat)	Soaks in until sealed

If your surface is anything rougher than smooth drywall, take the can’s figure and shade it down. For brick and stucco, a block filler or masonry primer on the first coat tames the thirst and lets your finish coats cover closer to normal.

Roller, brush or spray changes the figure

How you apply the paint changes how much of the gallon actually lands on the wall. The coverage on the can assumes a roller, which is the most efficient method for most surfaces.

• Roller: the benchmark. Almost all of the paint transfers to the wall, so use the can’s figure as-is.
• Brush: similar efficiency to a roller, very little waste, but slow over large areas. Great for trim, cutting in and getting into texture.
• Spray: the fastest method and the thirstiest. Overspray, the paint left in the gun, hose and tip, and wind on exteriors all eat into the gallon. Effective coverage drops to 150 to 250 square feet per gallon, an overspray tax of 25 to 40 percent. Back-rolling the first coat after spraying improves adhesion and is worth the extra step.

If you plan to spray, add at least 25 percent to whatever the roller-based math tells you.

One coat versus two: the figure most people forget

Coverage on the can is per coat. Almost every real job needs two coats for an even, durable finish, which means the gallon’s effective coverage is cut in half. A gallon rated for 350 square feet covers about 175 square feet of finished, two-coat wall. Plan for two coats by default and only assume one when you are freshening the exact same color over a clean, sound surface.

Situation	Coats	Effective coverage per gallon
Same color refresh, clean wall	1	About 350 sq ft
New color, primed wall	2	About 175 sq ft
Light over dark, or bold color	2 to 3	120 to 175 sq ft
Bare drywall or wood	1 primer + 2 finish	Primer and paint counted separately

Quart, gallon and five-gallon yields

Paint is sold in three common sizes, and knowing what each covers helps you avoid buying a full gallon for a job a quart would finish, or hauling single gallons when a bucket is cheaper.

• Quart (0.25 gallon): covers about 85 to 100 square feet per coat. Perfect for trim, a single door, a small accent wall or touch-ups.
• Gallon: covers 350 to 400 square feet per coat, or roughly 175 square feet at two coats. The standard unit for a room’s walls.
• Five-gallon bucket: covers about 1,750 to 2,000 square feet per coat. The economical choice for whole houses, large exteriors and any single color you need a lot of, and it lets you box the paint so the color stays perfectly consistent.

How to read the coverage figure on the can

Every can prints a coverage claim, usually as a range like “covers up to 400 sq ft.” Read it like a pro: the “up to” is the best case on a smooth sealed surface with one coat, so mentally drop to the low end of the range for anything textured or porous, then halve it for two coats. Also check whether the figure is for the finish paint or, on a primer can, for sealing. Premium paints with more solids genuinely cover more per coat, so a 50 dollar gallon that finishes in two coats can be cheaper per finished wall than a 25 dollar gallon that needs three.

The formula: turn coverage into gallons for any job

Once you know a surface’s coverage figure, the math is three steps.

Step 1: Find your paintable square footage

For walls, multiply the perimeter of the room by the wall height, then subtract about 20 square feet per door and 15 per window. For a ceiling, floor or fence, it is simply length times width.

Step 2: Divide by the coverage figure

Take your square footage and divide by the per-gallon coverage for your surface from the chart above. That gives gallons for a single coat.

Step 3: Multiply by coats and add a cushion

Multiply by your number of coats, usually two, then add 10 to 15 percent for waste and touch-ups. Round up to the nearest gallon or quart, because that is how paint is sold.

A worked example: a textured living room

Say you have a 15 by 18 foot living room with 9-foot ceilings, knockdown-textured walls, two windows and one door. Here is the gallon count from start to finish.

Wall area: perimeter is 15 + 18 + 15 + 18 = 66 feet. At 9 feet tall that is 594 square feet gross. Subtract two windows (30 sq ft) and one door (20 sq ft) for 544 paintable square feet.

Coverage figure: knockdown texture covers about 300 square feet per gallon, not the smooth-wall 350.

Gallons: 544 / 300 = 1.8 gallons per coat. Two coats is 3.6 gallons. Add a 10 percent cushion to reach 4 gallons. Buy 4 gallons of wall paint.

Had you used the smooth-wall 350 figure and assumed one coat, you would have bought a single gallon and stalled halfway through the first pass. The texture and the second coat are what filled the cart.

How this applies to specific projects

The coverage figures above are the foundation, but each kind of project has its own quirks. Use these guides for the exact amounts and surface adjustments:

• A single room: walls, ceiling and trim are three separate buys. See how much paint for a room for size-by-size figures.
• A whole interior: our guide to paint for a house interior rolls every room into a whole-home gallon count.
• Ceilings: flat ceiling paint and the popcorn-texture tax are covered at how much paint for a ceiling.
• House exterior: siding, brick and stucco change everything; see paint for a house exterior.
• Decks and fences: thirsty horizontal and weathered wood is detailed at how much paint for a deck.
• Trim and doors: small areas, thin enamel, quart-level buys at trim and baseboards and a door.
• Primer: the lower 200 to 300 figure and when you truly need it lives at how much primer do I need.
• Basements: bare block walls drink paint; see paint for a basement.

Always add a touch-up cushion

Whatever the math says, buy 10 to 15 percent more. Walls have thin spots, rollers leave light passes, and a scuff a year from now will want matching paint. A leftover quart from the exact batch is worth far more than a near-match mixed later, because dye lots drift between mixes. Label the can with the room and the date and keep it somewhere it will not freeze.

From gallons to a real budget

Coverage tells you the gallons, but the gallons are only a slice of a paint job’s cost. Labor, prep and the paint grade you pick drive the total far more than the number of cans. To turn your square footage into a full line-item figure, run it through our painting calculator or build a quote with the free painting estimate tool.

Frequently asked questions

How much does a gallon of paint cover?

About 350 to 400 square feet per coat on smooth, primed drywall, and closer to 350 in real-world use. Because most jobs need two coats, a gallon covers roughly 175 square feet of finished wall.

How many square feet does a gallon of paint cover with two coats?

About 175 square feet. Coverage on the can is per coat, so two coats halves the figure. A gallon rated at 350 square feet per coat finishes about 175 square feet when you apply two coats.

How much does a gallon of primer cover?

Only 200 to 300 square feet per gallon, less than paint, because primer is built to seal and bond rather than build a film. Always buy primer by its own lower coverage figure.

Why does my paint cover less than the can says?

The can figure is a best case on a smooth, sealed surface with one coat. Texture, bare or porous spots, dark colors, spraying and a second coat all reduce real coverage. Plan on 350 square feet per gallon for interior walls and less for rough surfaces.

How much does a 5-gallon bucket of paint cover?

About 1,750 to 2,000 square feet per coat, or roughly 875 to 1,000 square feet at two coats. A bucket is the economical choice for whole houses and large exteriors, and it keeps a single color perfectly consistent.

Does a gallon of paint cover more on smooth or textured walls?

Smooth walls. Texture adds hidden surface area, so a gallon that reaches 400 square feet on smooth drywall may cover only 300 on knockdown texture and far less on stucco or brick.