Paint Coverage Calculator

How to Use This Paint Coverage Calculator

Paint coverage typically ranges from 350–400 square feet per gallon for smooth surfaces, and less for textured or porous surfaces. Two coats are standard for most projects — dark colors going over light, or light over dark, may require three. Always add 10–15% extra for waste, touch-ups, and irregular walls. Enter your project dimensions above for an instant material estimate.

How the Calculation Works

Gallons needed = (wall area in sq ft) / coverage rate × coats. Area = 2×(L+W)×H − doors/windows.

Planning Your Project

Accurate measurement is the foundation of any successful home improvement project. Measure twice, order once. Always add 10–15% to your calculated material needs to account for cuts, waste, and mistakes. For larger projects, it's worth getting a professional estimate to cross-check your calculations.

Cost Estimation Tips

Material costs vary significantly by quality tier and supplier. Get at least three quotes for any project over $500. Factor in delivery costs for heavy materials. Consider tool rental costs if you don't own the necessary equipment. For DIY projects, be realistic about your skill level — mistakes can be costly.

Frequently Asked Questions

Q: How much extra material should I order?
A: Add 10% for simple rectangular rooms or areas, 15% for rooms with angles or complex cuts, and up to 20% for diagonal patterns or natural stone with high waste.

Q: Can I return unused materials?
A: Most major home improvement retailers accept returns of unopened materials within 90 days. Keep your receipt and don't open all units until you are sure they aren't needed.

Disclaimer: These are estimates for planning purposes. Consult a professional contractor for complex projects.