A common early estimate for smooth walls is 350–400 square feet per US gallon per coat, or roughly 8.6–9.8 square meters per liter. The coverage range on the selected product label is more reliable than any universal rule.
Coverage reference table
| Container | Approximate smooth-wall coverage | Metric equivalent |
|---|---|---|
| 1 US quart | 85–100 sq ft | 7.9–9.3 m² |
| 1 US gallon | 350–400 sq ft | 32.5–37.2 m² |
| 5 US gallons | 1,750–2,000 sq ft | 162.6–185.8 m² |
| 1 liter | 92–106 sq ft | 8.6–9.8 m² |
| 5 liters | 460–530 sq ft | 42.8–49.2 m² |
These are planning conversions, not promises. Manufacturers publish wider or lower ranges for particular coatings. For example, one Behr interior flat product lists 250–400 square feet per gallon, while Sherwin-Williams describes 350–400 square feet as a typical gallon estimate.
How far each paint container goes for one or two coats
Container coverage is normally stated for one coat. For two coats, divide the one-coat area by two; do not assume the same container will cover the full area twice. The table below uses the 350–400 sq ft per gallon smooth-wall planning range shown above.
| Container | One coat | Two coats | Typical use |
|---|---|---|---|
| 1 quart | About 85–100 sq ft | About 43–50 sq ft | Small wall section, trim, or touch-ups |
| 1 gallon | About 350–400 sq ft | About 175–200 sq ft | One small-to-medium room, depending on measured wall area |
| 5-gallon bucket | About 1,750–2,000 sq ft | About 875–1,000 sq ft | Several rooms or a large continuous project using one product and color |
These figures are area limits before application loss, surface absorption, and package rounding. For an actual purchase, enter the measured area, number of coats, and the selected product's label coverage in the paint calculator.
Understand the difference between area and coating area
Coverage applies to one coat. A 600-square-foot wall project receiving two coats represents 1,200 square feet of coating area. At 375 square feet per gallon, the theoretical requirement is 3.2 gallons before accounting for practical loss or container rounding.
Coating area = paintable area × coatsTheoretical gallons = coating area ÷ coverage per gallonWhy real coverage changes
| Condition | Likely effect | Planning response |
|---|---|---|
| Smooth, sealed wall | Closer to label maximum | Use the normal product range |
| New drywall or porous repair | Absorbs more coating | Use appropriate primer and separate its coverage |
| Heavy texture or rough masonry | More actual surface and deep recesses | Use the lower end of the range |
| Large color change | More coats may be needed for hiding | Estimate coats separately from physical coverage |
| Spray application | Overspray and masking loss | Check the spray-can coverage guide, then use the spray paint calculator |
Coverage and hiding are not the same. A gallon may spread across the stated area but still leave an uneven color or sheen. The texture of the substrate and paint retained by tools also make theoretical coverage differ from field use. For overhead work, use the ceiling paint calculator so the ceiling's product, coats, and allowance remain separate from the walls.
Primer is a separate calculation
Do not reuse the finish-paint coverage automatically. Sherwin-Williams gives approximately 200–300 square feet per gallon as a general primer reference, but the correct value depends on the primer and surface. Calculate primer with its own coats and label coverage using the primer calculator.
Worked examples
One 300-square-foot accent wall
At 375 square feet per gallon for one coat, the theoretical need is 0.8 gallon. A quart covers only about one quarter of a gallon, so four quarts would generally be less practical than a gallon.
Two coats on 1,000 square feet
The coating area is 2,000 square feet. At 350–400 square feet per gallon, the theoretical range is 5–5.71 gallons. The selected packaging, texture, and desired touch-up reserve determine the final purchase.
Metric project: 60 square meters, two coats
The coating area is 120 square meters. At 9 square meters per liter, the theoretical quantity is 13.33 liters. Use the calculator to round that result into locally available container sizes.
Frequently asked questions
How much does a quart of paint cover?
At a smooth-wall rate of 350–400 sq ft per gallon, one US quart covers about 85–100 sq ft for one coat or roughly 43–50 sq ft for two coats. Texture, porosity, and application loss can reduce that area.
How much does one gallon of paint cover?
One gallon commonly covers about 350–400 sq ft for one coat on a smooth, sealed wall. For two coats, plan on about 175–200 sq ft before allowance, then replace the general range with the selected product's label value.
How much does a five-gallon bucket cover?
Five gallons at the same planning rate cover about 1,750–2,000 sq ft for one coat or 875–1,000 sq ft for two coats. A bucket is practical only when the areas use the same product and color and the container size fits the project.
Does a five-gallon bucket always cover five times as much?
For the same product and conditions, its nominal volume is five times a gallon. Real application loss and leftover material can still change the usable result.
Can I use the highest number printed on the label?
Use it only when your surface and application resemble the conditions behind that figure. The lower end is safer for textured or absorbent surfaces.
Should waste be included by lowering coverage?
Keep them separate when possible. Enter the label coverage, then add an explicit allowance for roller, tray, transfer, overspray, and future touch-ups. This makes the estimate easier to audit.
