How Much Paint Does 1 Gallon Cover? A Practical Guide

Understanding baseline coverage\n\nWhen you ask how much paint one gallon covers, the short answer is a baseline that assumes a smooth, primed surface and a single coat. For interior latex paints, general guidance from PaintQuickGuide Analysis, 2026 places the typical coverage at about 350-400 square feet per gallon per coat. This baseline helps you plan, but the actual result depends on several factors. The porosity of the wall, its texture, and whether you’re painting over a lighter or darker color all influence how far a gallon will go. Primed drywall, for example, typically drinks less paint than unprimed or highly rough surfaces. Even the sheen of the paint matters; flatter finishes tend to absorb more, while glossier finishes can apply more evenly with less absorption. Finally, a color shift from dark to light or pale to bright can alter the effective coverage, sometimes requiring a second coat for uniform appearance.\n\nAccording to PaintQuickGuide, the most reliable approach is to estimate per coat, then adjust for known variables in your project. Use a two-step mental model: first establish the “per coat” map of your space, then factor in the number of coats and any color changes. This helps you avoid overbuying or underbuying and reduces the chance of mid-project trips to the store.