How Many Square Feet Does a Gallon of Paint Cover?

If you’re preparing to paint a room, house, ceiling, or other surface, one of the first questions you’ll probably ask is, how many square feet in a gallon of paint?

A typical gallon of interior paint generally covers approximately 350 to 400 square feet with one coat, although actual coverage varies by product and surface.

Some high-quality paints may advertise coverage around 400 square feet per gallon, while certain primers, textured paints, exterior coatings, and specialty products may cover less.

The amount of paint you need also depends on whether you’re applying one coat or two coats. For example, if a gallon covers 400 square feet with one coat, you would need roughly two gallons to apply two coats to 400 square feet.

Surface condition matters, too. Porous drywall, unpainted wood, rough surfaces, and dramatic color changes can require additional paint.

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The best way to estimate your project is to calculate the total surface area first and then divide it by the manufacturer’s stated coverage rate.

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Quick Answer: How Many Square Feet Does 1 Gallon of Paint Cover?

1 gallon of paint typically covers about 350–400 square feet with one coat.

However, this is an estimate rather than a universal rule.

A practical guide is:

Paint Coverage	Approximate Area
Lower coverage	250–300 sq ft
Typical coverage	350–400 sq ft
High coverage	400–450+ sq ft

Always check the paint can or manufacturer’s product information for the specific coverage rate.

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How Much Area Does a Gallon of Paint Cover?

For a typical interior wall paint, you can use 350–400 square feet per gallon as a starting estimate.

For example, if your walls total 1,200 square feet and the paint covers 400 square feet per gallon:

1,200 ÷ 400 = 3 gallons

That would provide approximately one coat.

For two coats:

3 × 2 = 6 gallons

In practice, you may want to purchase a little extra to account for absorption, waste, touch-ups, and differences between the estimated and actual coverage.

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What Determines How Many Square Feet a Gallon of Paint Covers?

Paint coverage isn’t determined by the gallon alone. Several factors can affect the amount of surface you can cover.

1. Type of Paint

Different paints have different formulations and coverage rates.

Interior wall paint, ceiling paint, primer, exterior paint, and specialty coatings may all cover different amounts.

2. Surface Texture

Smooth drywall generally requires less paint than rough or heavily textured surfaces.

A rough surface has more exposed area, which can increase paint consumption.

3. Surface Porosity

New drywall, bare wood, masonry, and other porous surfaces can absorb paint.

Primer may help reduce absorption and create a more consistent surface.

4. Number of Coats

Two coats require approximately twice the paint of one coat, although the exact amount can vary.

5. Color Change

Covering a dark color with a much lighter color can require additional coats.

6. Application Method

Brushes, rollers, and sprayers can produce different levels of waste and coverage.

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How to Calculate How Much Paint You Need

A simple calculation can help estimate your paint requirement.

Step 1: Calculate the surface area

For a rectangular wall:

Length × Height = Wall Area

For example:

A wall is 15 feet long and 8 feet high.

15 × 8 = 120 square feet

Step 2: Calculate all walls

If there are four walls, calculate each wall separately and add them together.

Step 3: Subtract large openings

You can subtract doors and windows if you want a more precise estimate.

Step 4: Divide by paint coverage

If your total area is 1,200 square feet and the paint covers 400 square feet per gallon:

1,200 ÷ 400 = 3 gallons

Step 5: Account for coats

For two coats:

3 × 2 = 6 gallons

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Paint Calculation Formula

The basic formula is:

Gallons Needed = Total Square Feet ÷ Coverage Per Gallon × Number of Coats

For example:

1,000 sq ft ÷ 400 sq ft per gallon × 2 coats = 5 gallons

Therefore, approximately 5 gallons would be needed for two coats.

Because actual coverage varies, round up when purchasing rather than assuming you can use every drop.

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How Many Square Feet Does 1 Gallon of Paint Cover With Two Coats?

This depends on how you interpret coverage.

If a gallon covers 400 square feet for one coat, then that gallon can cover approximately:

200 square feet with two coats

Why?

The same 400 square feet needs to be painted twice:

400 ÷ 2 = 200 square feet

So, approximately:

Coats	Area Covered by 1 Gallon
1 coat	400 sq ft
2 coats	200 sq ft
3 coats	133 sq ft

These are simplified estimates based on 400 square feet per gallon for one coat.

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How Many Gallons of Paint for 500 Square Feet?

Assuming one gallon covers 400 square feet:

500 ÷ 400 = 1.25 gallons

So you would need approximately:

1.25 gallons for one coat

For two coats:

1.25 × 2 = 2.5 gallons

In practice, buying 3 gallons would give you a reasonable margin for waste and touch-ups.

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How Many Gallons of Paint for 1,000 Square Feet?

Assuming coverage of 400 square feet per gallon:

1,000 ÷ 400 = 2.5 gallons

For one coat, you would need approximately 2.5 gallons.

For two coats:

2.5 × 2 = 5 gallons

So approximately 5 gallons would be needed for two coats under this coverage assumption.

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How Many Gallons of Paint for 1,500 Square Feet?

At 400 square feet per gallon:

1,500 ÷ 400 = 3.75 gallons

Therefore, you would need approximately:

4 gallons for one coat

For two coats:

3.75 × 2 = 7.5 gallons

You’d generally round up and consider purchasing approximately 8 gallons, depending on the actual product coverage.

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How Many Gallons of Paint for 2,000 Square Feet?

Using 400 square feet per gallon:

2,000 ÷ 400 = 5 gallons

Therefore:

• One coat = 5 gallons
• Two coats = 10 gallons

This assumes the full 2,000 square feet is the surface being painted and that the paint actually achieves 400 square feet per gallon.

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Paint Coverage Chart

Assuming approximately 400 square feet per gallon for one coat:

Surface Area	1 Coat	2 Coats
100 sq ft	0.25 gal	0.5 gal
200 sq ft	0.5 gal	1 gal
300 sq ft	0.75 gal	1.5 gal
400 sq ft	1 gal	2 gal
500 sq ft	1.25 gal	2.5 gal
600 sq ft	1.5 gal	3 gal
800 sq ft	2 gal	4 gal
1,000 sq ft	2.5 gal	5 gal
1,500 sq ft	3.75 gal	7.5 gal
2,000 sq ft	5 gal	10 gal

Actual requirements should be based on the coverage rate printed on the specific paint product.

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How Many Square Feet Does a Quart of Paint Cover?

A quart is one-fourth of a gallon.

If one gallon covers 400 square feet:

400 ÷ 4 = 100 square feet

So a quart could theoretically cover about:

100 square feet with one coat

Actual coverage varies by paint and surface.

Quarts can be useful for:

• Small rooms
• Accent walls
• Trim
• Doors
• Touch-ups
• Small furniture projects

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How Many Square Feet Does a Pint of Paint Cover?

A pint is one-eighth of a gallon.

If a gallon covers 400 square feet:

400 ÷ 8 = 50 square feet

So one pint could cover approximately:

50 square feet with one coat

This is a rough estimate and is more useful for small projects and touch-ups than full-room painting.

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How Many Square Feet Does 5 Gallons of Paint Cover?

If one gallon covers 400 square feet:

5 × 400 = 2,000 square feet

Therefore, five gallons could cover approximately:

2,000 square feet with one coat

For two coats:

2,000 ÷ 2 = 1,000 square feet

So five gallons could theoretically provide two coats over approximately 1,000 square feet.

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Does a Gallon of Paint Cover 400 Square Feet?

Often, but not always.

Many interior paints advertise coverage in the general range of 350–400 square feet per gallon.

However, some products may have higher or lower coverage ratings.

You should always look at the product label because coverage depends on the formulation and recommended application thickness.

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Does Primer Cover the Same Square Footage as Paint?

Not necessarily.

Primer coverage can differ from paint coverage.

Primers are often used on:

• New drywall
• Bare wood
• Stained surfaces
• Previously unpainted surfaces
• Dramatic color changes

The specific product’s label should provide its recommended coverage.

If you’re calculating a project requiring both primer and paint, calculate them separately.

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How Much Paint Do I Need for a 12 × 12 Room?

A 12 × 12 room has:

12 × 12 = 144 square feet of floor area

But this does not mean the walls contain only 144 square feet.

To calculate wall area, you need the room’s perimeter and ceiling height.

The perimeter is:

12 + 12 + 12 + 12 = 48 feet

If the ceiling is 8 feet high:

48 × 8 = 384 square feet of wall area

If you subtract doors and windows, the actual paintable area will be lower.

At 400 square feet per gallon, one gallon may be enough for one coat in this simplified example, while two coats would require roughly two gallons.

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How Much Paint Do I Need for a 10 × 10 Room?

A 10 × 10 room has a perimeter of:

10 + 10 + 10 + 10 = 40 feet

With an 8-foot ceiling:

40 × 8 = 320 square feet

So the walls contain approximately 320 square feet before subtracting doors and windows.

At 400 square feet per gallon, approximately one gallon could cover one coat.

For two coats, approximately two gallons may be required.

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Should You Subtract Doors and Windows?

Yes, if you want a more precise estimate.

Suppose your walls total:

500 square feet

and your doors and windows account for:

60 square feet

Then the approximate paintable surface is:

500 − 60 = 440 square feet

At 400 square feet per gallon:

440 ÷ 400 = 1.1 gallons

You would likely want more than exactly 1.1 gallons to account for application losses and touch-ups.

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Does Wall Texture Affect Paint Coverage?

Yes.

Smooth surfaces generally allow more predictable coverage.

Textured walls can require more paint because the coating has to cover the raised and recessed portions of the surface.

Examples include:

• Popcorn texture
• Heavy orange peel
• Stucco
• Rough plaster
• Textured masonry

For heavily textured surfaces, don’t assume the manufacturer’s maximum coverage will always be achieved.

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Does New Drywall Need More Paint?

It can.

New drywall and joint compound can be porous and absorb paint unevenly.

A suitable drywall primer can help seal the surface and improve the uniformity of the finish coat.

Without proper preparation, you may need additional coats of paint to achieve the desired appearance.

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Does Dark Paint Require More Paint?

It can.

If you’re painting a dark wall a much lighter color, one coat may not completely hide the original color.

You might need:

• Primer
• Additional coats
• A paint formulated for strong hiding

The number of coats depends on the existing surface, colors, paint formulation, and desired finish.

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Should You Buy Extra Paint?

Usually, buying a small amount of extra paint is a good idea.

Paint can be lost through:

• Roller absorption
• Brush loading
• Spills
• Overspray
• Uneven surfaces
• Touch-ups
• Future repairs

Having leftover paint from the same batch can also be useful for future touch-ups.

However, don’t buy excessive quantities. Check the manufacturer’s coverage information and calculate your project carefully.

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How to Estimate Paint for a Whole House

Estimating paint for an entire house requires more than using the home’s total square footage.

For example, a 2,000-square-foot house does not necessarily have 2,000 square feet of walls.

The home’s floor area and paintable wall area are different measurements.

To estimate wall paint:

1. Measure each room.
2. Calculate wall area.
3. Subtract major doors and windows.
4. Add the rooms together.
5. Check the paint’s coverage rate.
6. Multiply by the number of coats.
7. Add a reasonable allowance for waste and touch-ups.

Ceilings should generally be calculated separately.

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Wall Area vs. Floor Area

This distinction is extremely important.

A room with a floor area of:

12 × 12 = 144 square feet

doesn’t have only 144 square feet of paintable walls.

If the ceiling is 8 feet high, the four walls have approximately:

48 × 8 = 384 square feet

before subtracting openings.

Therefore, when calculating paint, don’t simply use the home’s floor area unless the product or estimator specifically calls for that measurement.

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FAQs

1. How many square feet does one gallon of paint cover?

A typical gallon of interior paint often covers approximately 350–400 square feet for one coat, but the actual coverage depends on the specific product and surface.

2. How many square feet will a gallon of paint cover with two coats?

If a gallon covers 400 square feet with one coat, it will cover approximately 200 square feet with two coats.

3. How many gallons of paint do I need for 1,000 square feet?

At 400 square feet per gallon, approximately 2.5 gallons are needed for one coat or 5 gallons for two coats.

4. Does paint coverage include two coats?

Usually, the coverage listed on a paint can refers to one coat, unless the manufacturer states otherwise. Always check the product label.

5. How much area does a quart of paint cover?

If one gallon covers 400 square feet, a quart theoretically covers about 100 square feet for one coat.

6. Does textured wall paint require more paint?

Often, yes. Textured or rough surfaces can require more paint than smooth surfaces because they have more surface area and can absorb or hold more coating.

7. Should I subtract windows and doors when calculating paint?

Yes. Subtracting large doors and windows can make your estimate more accurate, although buying a small amount of extra paint is still advisable for waste and touch-ups.

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Conclusion

So, how many square feet are in a gallon of paint?

A typical gallon of interior paint generally covers approximately:

350–400 square feet with one coat

However, actual coverage varies depending on the paint product, surface texture, porosity, application method, color change, and number of coats.

For a quick estimate, if your paint covers 400 square feet per gallon, you can use:

Total paintable area ÷ 400 = gallons for one coat

For two coats, multiply the result by two.

For example, a 1,000-square-foot paintable surface would require approximately 2.5 gallons for one coat or 5 gallons for two coats at a 400-square-foot coverage rate.

The most accurate approach is to check the manufacturer’s stated coverage, measure your actual paintable surface, account for doors and windows, and allow some extra for waste and future touch-ups.

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