How many square feet does one gallon of paint cover?

Most interior paints cover between 300-400 square feet per gallon per coat, depending on the paint type, surface texture, and application method. Always check your specific paint can for the manufacturer's coverage rate.

Should I include doors and windows in my paint calculation?

Yes, subtracting doors and windows improves accuracy, especially in rooms with many openings. The calculator deducts approximately 21 sq ft per standard door and 15 sq ft per typical window for more precise estimates.

How many coats of paint do I really need?

Most rooms need 1-2 coats of quality paint. However, dramatic color changes, covering dark colors with light paint, or painting new drywall may require 2-3 coats. Primer can help achieve better coverage with fewer top coats.

Why does the calculator recommend buying more paint than the exact amount?

Paint is sold in standard sizes (gallons and quarts), and rounding up ensures you have enough paint to complete your project. Extra paint also handles waste from cutting in, touch-ups, and provides material for future repairs.

Can I use this calculator for exterior painting projects?

While designed primarily for interior use, the calculator works for exterior walls too. However, exterior paint coverage may vary significantly due to surface texture, weather conditions, and different paint formulations. Always check exterior paint specifications.

What if I'm painting over wallpaper or textured surfaces?

Wallpaper and heavily textured surfaces typically require more paint than smooth walls. Consider adding an extra coat to your calculation, or use a lower coverage rate (250-300 sq ft per gallon) for more accurate estimates.

Paint Calculator

Estimate paint gallons for walls and ceilings. Account for doors, windows, and multiple coats with customizable coverage per gallon for accurate project planning.

paint

walls

ceiling

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Common Room Sizes

Popular room dimensions for quick paint estimation

Room Details & Paint Options

Enter room dimensions and painting preferences

Paint Surface

Length (ft)

Width (ft)

Wall Height (ft)

Doors

Windows

Coats

Coverage (sq ft/gal)

How it works: The calculator measures wall area (accounting for doors and windows), multiplies by the number of coats, then divides by paint coverage. Coverage varies by paint type and surface.

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