How much area will the paint cover?
Multiply gallons by the product coverage per gallon. For two coats, divide that area by 2. Texture, porosity, overspray, and touchups reduce usable coverage.
One coat vs two coats
A gallon rated for 350 sq ft covers about 350 sq ft for one coat, or about 175 sq ft for two coats before waste. Primer, dark color changes, and rough surfaces can change that.
Use label coverage first
Paint, stain, masonry coating, spray paint, and specialty coatings can have very different coverage. The product label is the best input for final buying.
Paint room example estimates
Examples use 2 coats and 350 sq ft per gallon before subtracting openings.
| Room | Wall area for 2 coats | Estimated gallons |
|---|---|---|
| 10 ft x 12 ft room | 704 sq ft | 2.01 gallons |
| 12 ft x 12 ft room | 768 sq ft | 2.19 gallons |
| 12 ft x 16 ft room | 896 sq ft | 2.56 gallons |
| 15 ft x 20 ft room | 1,260 sq ft | 3.60 gallons |
Before you calculate
- Measure paintable surface area rather than relying only on floor area.
- Separate walls, ceilings, trim, decks, cabinets, and exterior surfaces when products or coats differ.
- Use the actual product coverage from the label.
Common mistakes
- Forgetting coat count, primer, texture, color changes, and surface porosity.
- Combining trim, ceilings, doors, and walls in one estimate.
- Ignoring pattern repeat for wallpaper or absorption for stain.
Formula
covered sq ft = (paintVolume * coveragePerGallon) / coats / (1 + wastePercent / 100)
Assumptions
- Coverage is an estimate from the product label, not a guarantee.
- Two coats cover about half as much area as one coat at the same coverage rate.
- Texture, porosity, overspray, color changes, and touchups reduce usable coverage.
Example
Estimated paint coverage area coverage: 175 sq ft
How to use this calculator
- Enter paint volume in gal.
- Enter coverage per gallon in sq ft.
- Enter coats in count.
- Enter waste in %.
- Review the live estimate and compare it with the example result.
- Check the formula, assumptions, product labels, and site conditions before using the Paint Coverage Area Calculator result to plan materials.
Before you buy materials
- Round up to full gallons, rolls, or containers.
- Keep extra material for touchups when color consistency matters.
FAQ
How many square feet does 1 gallon of paint cover?
A common planning number is about 350 sq ft for one coat on a smooth surface, or about 175 sq ft for two coats.
How many square feet does 5 gallons of paint cover?
At 350 sq ft per gallon, 5 gallons covers about 1,750 sq ft for one coat or about 875 sq ft for two coats before waste.
Why does real paint coverage change?
Texture, porosity, primer, color change, application method, overspray, and touchups can all reduce real coverage.
How many sq ft for a 1 gallons at 350 sq ft per gallon, 2 coats, and 0% waste project?
A project using 1 gal paint volume, 350 sq ft coverage per gallon, 2 count coats, 0 % waste requires exactly 175 sq ft. This includes any waste percentages if applicable.
Related calculators
This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.