Paint Coverage per Gallon Guide

Standard Paint Coverage

As a general rule, one gallon of paint covers approximately 350–400 square feet of smooth surface. This is the coverage rate used by professional painters and paint manufacturers:

1 gallon: 350–400 sq ft

1 quart: 85–100 sq ft

1 pint: 40–50 sq ft

💡 These rates assume a smooth, properly primed surface with one coat of high-quality paint applied with a roller.

What Affects Paint Coverage

Surface Texture

Rough surfaces absorb significantly more paint than smooth ones. Smooth drywall yields full coverage. Textured walls (knockdown, orange peel) reduce coverage by 10–20%. Brick and stucco can reduce coverage by 50% or more.

Color Change

Dramatic color changes require more paint. Going from a dark wall to a light one may need an extra coat. Using a tinted primer reduces the number of top coats needed.

Application Method

Rollers provide the most even coverage and minimal waste. Brushes use more paint per square foot. Sprayers are the most efficient but require more overspray management.

Paint Quality

Higher-quality paint contains more solids and less water, providing better coverage per coat. Premium paints often cover in one coat what budget paints need two coats to achieve.

Surface Porosity

New drywall, bare wood, and unpainted surfaces absorb more paint than previously painted surfaces. Always prime porous surfaces before painting for consistent coverage.

How to Calculate Coverage for Your Project

To estimate how much paint you need, start by calculating the total wall area (length × width × height for each wall). Subtract windows (15 sq ft each) and doors (20 sq ft each). Multiply by the number of coats. Then divide by 350 for a conservative estimate or 400 for a more optimistic one. Always round up.

→ For example, a 12×10 foot room with 8 ft ceilings, 2 windows, and 1 door needing 2 coats:

Wall area = 352 sq ft → net area = 302 sq ft → total with 2 coats = 604 sq ft → with a 350 sq ft per gallon paint = 1.73 = 2 gallons.

Coverage Rates by Brand

While most paints follow the standard coverage rate, some brands vary slightly:

•Sherwin-Williams: 350–400 sq ft per gallon (most interior paints)

•Benjamin Moore: 350–400 sq ft per gallon (Regal and Aura lines)

•Behr: 250–400 sq ft per gallon (check specific product label)

•Valspar: 300–400 sq ft per gallon (varies by product line)

💡 Always verify coverage on the specific paint can label — premium lines often have better coverage than budget lines.

Tips for Maximizing Coverage

1Use a quality primer before painting — it seals the surface and reduces top coat absorption.

2Mix paint thoroughly before and during use to ensure consistent solids distribution.

3Apply paint at the recommended spread rate — too thick wastes paint, too thin requires more coats.

4Maintain a wet edge when rolling to avoid lap marks and uneven coverage.

Summary

While standard coverage is 350–400 sq ft per gallon, actual coverage depends on surface texture, color change, application method, and paint quality. Measure carefully, factor in your specific conditions, and always buy extra for touch-ups.

Calculate exactly how much paint you need with our free paint calculator.