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Paint Coverage Calculator

Result
—gallons
◆ LIVE 3D PREVIEW
Coverage Rate
—
Est. Cost
—

How Much Paint Do I Need?

Divide total wall area by coverage rate: Flat: 400 sqft/gal, Eggshell: 350, Satin: 325, Semi-gloss: 300. Multiply by coats (usually 2). A 12×15ft room with 8ft ceilings = ~430 sqft walls → 3 gallons for 2 coats.

CalcBuild › Paint Coverage Calculator

How to Calculate Paint Coverage

Use this free paint coverage calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

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💡 Pro Tips — Paint Coverage

❓ Frequently Asked Questions

+How much area does a gallon cover?
350-400 sq ft on smooth surfaces with one coat. Textured walls reduce coverage by 20%. Porous surfaces like new drywall may need more.
+Do I need primer?
Yes for: new drywall, dark to light color changes, covering stains, or switching between oil-based and latex paint.
+How many coats do I need?
Minimum 2 coats for best coverage. Use 3 for dramatic color changes. Quality paints often cover in fewer coats.
+What sheen for which room?
Flat: ceilings. Eggshell: living rooms, bedrooms. Satin: hallways, kids rooms. Semi-gloss: kitchens, bathrooms. Gloss: trim, doors.
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