Calculating paint quantity ensures you buy enough to complete your project without multiple trips to the store. This calculator determines gallons needed based on wall area and number of coats.
One gallon of paint covers approximately 350-400 square feet per coat on smooth surfaces. Textured walls, porous surfaces, and dark colors may require 20-30% more paint. Most projects need two coats for even coverage and durability.
Always use primer on new drywall, bare wood, or when covering dark colors with light paint. Primer seals surfaces and improves paint adhesion. Some paints include primer, but separate primer gives better results on challenging surfaces.
Calculate paint for walls separate from ceilings, as you may use different finishes. Flat or matte for ceilings, eggshell or satin for walls, and semi-gloss for trim and high-moisture areas. Measure doors and windows and subtract their area for more accurate estimates.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Approximately 350-400 square feet per coat on smooth surfaces.
Yes for new drywall, bare wood, stains, or covering dark with light colors.
Two coats is standard. Dark colors or new drywall may need three.
Flat for ceilings, eggshell/satin for walls, semi-gloss for trim and bathrooms.
Not recommended. Remove wallpaper first for best results and durability.