Paint Coverage Calculator
How much paint do you need? Enter your room length, width, number of coats, and paint type, and this free calculator tells you exactly how many gallons to buy — including for 2-coat coverage and darker colors. The math: area (length × width) × coats ÷ coverage per gallon (about 350 sq ft/gal for light colors), rounded up. Always buy about 10% extra as a buffer.
Enter your room dimensions and paint type to calculate exactly how many gallons you need for your ceiling — including for 2-coat coverage and specialty colors.
How this is calculated
Area (Length × Width) × number of coats ÷ coverage per gallon, rounded up. Coverage defaults: 350 sq ft/gal (light), 300 (medium), 250 (dark). Always buy ~10% extra as a buffer.
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