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Paint cost

Estimate paint gallons and total cost from wall area, coverage and coats.

Built and maintained by The NumberPrism Editorial TeamEditorial policy

Your details

Wall area (sq ft)

Coverage per gallon (sq ft)

Number of coats

Price per gallon ($)

Results update as you type. The formula and assumptions are explained below the calculator.

Estimated paint cost

$135.00

Paint needed2.29 gal

Gallons to buy3 gal

Cost per coat$51.43

Total wall area400 sq ft

Estimate assumes a sealed, even surface and the coverage figure on the can. Primer, trim, textured walls and colour changes add paint.

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What does this tool do?

Paint is sold in whole gallons and coverage varies by surface. This calculator multiplies area by coats, divides by coverage and rounds up to the gallons you must buy.

The Formula

Gallons = ⌈Area × Coats ÷ Coverage per gallon⌉; Cost = Gallons × Price per gallon

Frequently Asked Questions

How much area does a gallon cover?

Roughly 350 square feet per coat on smooth, primed drywall. Textured or porous surfaces can cut coverage by a third or more.

Should I buy extra paint for touch-ups?

Keep about a quart from the same batch for future repairs. Paint stored in a sealed can lasts several years in a cool, dry place.

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