How Much Paint Do I Need for a House Exterior?

Quick answer: A 2,000 square foot house needs about 8 to 12 gallons of exterior paint for two coats on the body, plus 2 to 4 gallons for trim. Brick and stucco soak up more than smooth vinyl or wood siding, so plan toward the higher end for textured surfaces.

Exterior paint is bought in larger quantities and used over a tougher, thirstier surface than interior walls, so a small miscalculation turns into several wasted gallons or a second trip mid-project. This guide gives you body and trim quantities by house size, the formula behind them, and the surface adjustments that change everything. For the dollars side, our guide to the cost to paint a house covers labor and pricing.

Exterior paint needed by house size

The table is based on a two-story home, two coats on the body, and exterior paint coverage of 300 square feet per gallon. Body and trim are listed separately because trim uses a different product.

Home size (floor area)	Body paint, 2 coats	Trim paint	Total to buy
1,000 sq ft	5 to 6 gal	1 to 2 gal	6 to 8 gal
1,500 sq ft	7 to 9 gal	2 to 3 gal	9 to 12 gal
2,000 sq ft	8 to 12 gal	2 to 4 gal	10 to 16 gal
2,500 sq ft	12 to 15 gal	3 to 5 gal	15 to 20 gal
3,000 sq ft	15 to 18 gal	4 to 6 gal	19 to 24 gal

Floor area is a useful shortcut, but the real driver is the wall surface area, which depends on how many stories the home has and how much window and door area breaks up the walls. The formula below is more accurate when your home is an unusual shape.

The formula for exterior wall area

Step 1: Measure the perimeter

Walk the outside of the house and add up the length of every exterior wall.

Step 2: Multiply by wall height

Multiply the perimeter by the total wall height. A single story is about 10 feet, two stories about 20 feet. A 150-foot perimeter on a two-story home is 150 x 20 = 3,000 square feet of gross wall area.

Step 3: Subtract windows and doors

Subtract roughly 15 square feet per window and 20 per door. On an average home this is 10 to 15 percent of the wall area. Take 3,000 down to about 2,600 square feet.

Step 4: Divide by coverage, multiply by coats

Divide by 300 square feet per gallon for exterior surfaces, then multiply by two coats: 2,600 / 300 x 2 = roughly 17 gallons of body paint. Round to whole gallons and add a cushion.

Surface texture is the biggest variable

The same square footage uses very different amounts of paint depending on the siding material, because rough and porous surfaces have more actual area and soak up more.

Siding material	Coverage per gallon	Effect on quantity
Smooth vinyl or aluminum	350 to 400 sq ft	Lowest paint use
Smooth wood or fiber cement	300 to 350 sq ft	Baseline
Rough-sawn wood or shingles	250 to 300 sq ft	Add 15 percent
Stucco	150 to 250 sq ft	Add 30 to 50 percent
Brick (porous)	150 to 200 sq ft	Add 50 percent, prime first

Stucco and brick are the surfaces that blow budgets. Their texture and porosity can nearly double paint use compared to smooth siding of the same dimensions, and both usually need a masonry primer on the first coat.

Body, trim and accents are separate buys

Plan three quantities, not one:

• Body: the main siding color, the bulk of your gallons.
• Trim: fascia, soffits, window and door casings, corner boards. Usually 15 to 25 percent of the body amount, in a satin or semi-gloss.
• Accent: the front door and shutters. A quart each is plenty.

Primer on the first coat

You can skip primer when repainting sound, previously painted siding in a similar color. You need primer for bare wood, new fiber cement, masonry, severe color changes, and any spots where old paint was scraped to bare substrate. Spot-prime the bare areas at minimum, and full-prime brick and stucco.

Spraying versus brushing exteriors

Most exterior jobs are sprayed and back-rolled for speed. Spraying wastes paint to overspray and wind, so add 20 to 25 percent over the brush figure if you spray the whole house. Back-rolling the first coat pushes paint into the surface and improves adhesion, which matters more on exteriors that face weather.

Planning a two or three color scheme

Most exteriors use at least two colors, body and trim, and many add a third for the door and shutters. Each color is a separate quantity and a separate trip down the wrong aisle if you forget one. The body color is the bulk of your gallons. Trim is usually 15 to 25 percent of the body amount and wants a satin or semi-gloss for durability. The accent is small, a quart or two. Buy them together and label the cans by location, because matching a custom trim color later is far harder than keeping a leftover quart.

Prep is part of the quantity

An exterior coat only reaches its rated coverage on a sound surface. Scrape loose and peeling paint, sand the edges smooth, wash off chalk, dirt and mildew, and let everything dry before painting. Bare spots exposed by scraping need spot priming. Skipping prep means the new paint lifts off the old failing layer within a season, and a premature recoat is the most expensive way to double your paint use. Time spent on prep is paint saved later.

Always buy a cushion

Add 10 to 15 percent over the calculation. Exterior walls have more obstacles the simple math ignores, including eaves, gables, railings and trim returns. Keeping a labeled gallon for touch-ups is smart because exterior paint fades over years and a fresh near-match will stand out against weathered paint.

A worked example: a two-story 2,000 square foot home

Consider a two-story home with a 150-foot perimeter, 20 feet of wall height, average windows and doors, and smooth fiber cement siding. Gross wall area is 150 x 20 = 3,000 square feet. Subtract about 12 percent for openings to reach roughly 2,640 square feet of paintable body.

Body: 2,640 / 300 x 2 coats = 17.6 gallons. In practice many of these homes come in lower because not every wall is full two-story height, so the table range of 8 to 12 reflects typical homes with single-story sections, garages and gable triangles rather than a perfect box. Measure your own walls to land between the table figure and this maximum.

Trim: fascia, soffits and casings on a home this size use 2 to 4 gallons of satin trim paint. Accents: a quart each for the front door and shutters.

Stories, gables and dormers add hidden area

Floor area undersells a tall or complex home. A two-story house has far more wall per square foot of floor than a ranch. Gable ends add triangular wall above the normal height, dormers add little pop-out walls with their own trim, and a walkout basement adds a partial extra story on one side. Walk the whole exterior and measure actual wall surface when your home is anything other than a simple rectangle, or you will come up short on the tall faces.

Choosing primer by surface

Surface	Primer needed
Sound, previously painted siding, similar color	None, or spot-prime bare areas
Bare or new wood	Exterior wood primer, full coat
New fiber cement	Acrylic primer if not factory-primed
Brick, stucco, masonry	Masonry primer, full coat
Drastic color change or chalky old paint	Full bonding primer coat

Primer is a separate quantity using the same coverage math. On masonry it is not optional, because the porous surface will otherwise pull your finish paint in and leave it patchy.

Climate and timing affect coverage and adhesion

Exterior paint needs the right conditions to reach its rated coverage and bond properly. Painting in direct midday heat makes the paint skin over too fast, and painting when rain or heavy dew is coming within a day can ruin a fresh coat. Mild, dry days in the 50 to 85 degree range are ideal. Paint applied in poor conditions covers worse and fails sooner, which means a recoat and double the paint, so timing is part of getting the quantity right.

Paint grade tiers for exteriors

Exterior paint takes weather abuse, so grade matters more than indoors. Builder-grade paint is cheapest per gallon but covers less and fades faster, often needing a third coat and an earlier repaint. Mid and premium exterior lines cost more per gallon but cover better in two coats and last years longer, lowering both your gallon count today and your repaint frequency. On an exterior, the premium line is almost always the better value once you count coats and longevity.

When one coat is enough, and when it never is

The table assumes two coats because that is the honest default for an exterior repaint, but the real number depends on the situation. A same-color refresh over sound, recent paint can sometimes hold at one coat. Any color change, any chalky or faded surface, and any new or bare material needs two coats minimum, and a big light-over-dark change wants a tinted primer plus two coats. Bold or deep body colors can need three. Decide your coats before you buy, because guessing one coat and discovering you need two mid-job is the classic reason for a frustrating second supply run.

Buying for a multi-day exterior project

Exteriors take days, not hours, and weather can interrupt them, so buy the full quantity up front rather than a few gallons at a time. Mixing dye lots partway through a wall can leave a faint color shift, so for a single body color, have all the paint boxed from the same batch and intermixed if you are buying many gallons. This is standard practice for pros and worth doing yourself: pour multiple cans into one large bucket and stir so the color is perfectly consistent across the whole house, then refill from that bucket as you go.

From gallons to project budget

Paint is a small slice of an exterior job. Labor, prep, scaffolding and the number of stories drive the price far more than the paint itself. See our full breakdown of the cost to paint a house, or build a line-item figure from your own measurements with the free painting estimate tool.

Frequently asked questions

How much paint for a 2,000 square foot house exterior?

About 8 to 12 gallons for two coats on the body, plus 2 to 4 gallons of trim paint. Brick or stucco pushes the body figure toward the high end or beyond.

How many gallons to paint a 1,500 square foot house?

Roughly 7 to 9 gallons for the body at two coats, plus 2 to 3 gallons for trim, so 9 to 12 gallons total for smooth siding.

Does brick need more paint than siding?

Yes. Brick is porous and textured, covering only 150 to 200 square feet per gallon versus 350 plus for smooth siding. Plan on roughly 50 percent more paint and a masonry primer on the first coat.

How much exterior paint coverage per gallon?

Exterior paint covers about 300 square feet per gallon on smooth, primed surfaces, less on rough or porous materials. Use 300 for planning and adjust down for stucco, brick and rough wood.

How many gallons to paint a 2,500 square foot house?

Plan on roughly 12 to 15 gallons for the body at two coats, plus 3 to 5 gallons of trim paint, so 15 to 20 gallons total for smooth siding. Add more for brick, stucco or a heavily gabled two-story design.

Do I need to paint the trim a different product?

Yes. Trim takes more weather and handling than the broad walls, so it is usually painted in a satin or semi-gloss for durability while the body uses a flat or low-sheen finish. That makes trim a separate color and a separate quantity, normally 15 to 25 percent of the body amount.

Should I pressure wash before painting the exterior?

In almost every case, yes. Washing off dirt, chalk and mildew lets the new paint bond and reach its rated coverage. Let the surface dry fully for a day or two before painting, since trapped moisture causes peeling that forces an early and costly recoat.

For the inside, see how much paint a house interior needs, and check how much a gallon of paint covers on rough exterior surfaces.