Get the exact amount of paint you need for your walls. Our free paint calculator includes coverage estimates and cost calculations.
Wall Area
384.00 sq ft
Gallons Needed
1.9 gal
Estimated Cost
$67.20
Most paint covers about 400 square feet per gallon. Always buy a little extra for touch-ups later.
Paint Calculator estimates wall area, gallons needed, coat-adjusted coverage, and estimated cost from wall dimensions, openings, coats, coverage rate, waste or touch-up allowance, and paint price. It is free to use, works in a browser, and is designed for contractors, remodelers, builders, and DIY homeowners. Use this calculator when you need a fast material estimate before ordering supplies, comparing costs, or planning a construction project.
interior walls, ceilings, trim, exterior surfaces, touch-up planning
wall dimensions, openings, coats, coverage rate, waste or touch-up allowance, and paint price
wall area, gallons needed, coat-adjusted coverage, and estimated cost
The basic workflow is to calculate wall area, subtract openings, check coverage, then round up so you do not run short during installation.
QuickMaterialCalc's Paint Calculator is a free browser-based calculator for estimating wall area, gallons needed, coat-adjusted coverage, and estimated cost. Use it for planning guidance, then verify final quantities against site conditions, manufacturer specifications, and local code requirements.
Paint Calculator estimates wall area, gallons needed, coat-adjusted coverage, and estimated cost from wall dimensions, openings, coats, coverage rate, waste or touch-up allowance, and paint price. It is free to use, works in a browser, and is designed for contractors, remodelers, builders, and DIY homeowners.
Inputs: wall dimensions, openings, coats, coverage rate, waste or touch-up allowance, and paint price
Outputs: wall area, gallons needed, coat-adjusted coverage, and estimated cost
One gallon typically covers 350-400 square feet with one coat. For textured surfaces or dark colors, coverage may be less (250-300 sq ft).
Calculate the total wall area, subtract windows and doors, then divide by the paint coverage (typically 350-400 sq ft per gallon). Multiply by number of coats.
Measure each wall: height x width. Add all walls together for total surface area.
Measure and subtract the area of windows, doors, and other openings.
Check the paint can for coverage rate - typically 350-400 sq ft per gallon.
Multiply by 2 for two coats, which is recommended for most painting projects.
Always round up to the next whole gallon for convenience.
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