How Much Paint Do I Need?

Enter your room details below. We'll tell you exactly how many gallons to buy.

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Walls to Paint

Wall A0.0×0.0 ft = 0.00 sq ftWall B0.0×0.0 ft = 0.00 sq ftWall C0.0×0.0 ft = 0.00 sq ftWall D0.0×0.0 ft = 0.00 sq ftCeiling0.0×0.0 ft = 0.00 sq ft

Doors & Windows

Doors

Windows

Surface & Method

Surface Type

Application Method

Paint Details

Number of Coats

Coverage (sq ft / gallon)

Standard: 350 — no need to change unless your paint can says otherwise

Paint price (optional) ($ / gallon)

Enter a price to see paint, labor, and DIY vs. pro cost estimates

Enter your room details and click Calculate.

How This Paint Calculator Works

Our calculator computes each selected wall area individually (L × H or W × H), subtracts door and window areas, then applies surface and method factors. Divide net area by coverage rate and multiply by coats.

Painting Costs More Than Paint

Budget for the whole job — materials, labor, and the DIY-vs-pro decision — before you open a single can.

Paint Cost CalculatorRoom-by-room budgets with DIY and professional estimates based on current U.S. rates.Compare Paint BrandsBenjamin Moore vs. Sherwin-Williams vs. Behr — real price, coverage, and durability data.Cost to Paint a RoomA plain-English breakdown of what drives the price, and where you can save.