Calculate how much paint you need for walls, ceilings, and trim. Get accurate gallon estimates and material costs in seconds.
5
Paint Types
2
Systems
3
Surfaces
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Enter Room Details
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Enter your room dimensions and click Calculate to see paint estimates.
Wall Paint Needed
0 gal
Wall area: 0 sq ft
Ceiling Paint Needed
0 gal
Ceiling area: 0 sq ft
Primer Needed
0 gal
Trim Paint Needed
0 gal
Linear ft: 0
Estimated Material Cost
—
Enter price to calculate
Calculation Summary
Room Size0 × 0 × 0
Walls0 sq ft
Ceiling0 sq ft
Paint TypeEggshell
Coats2
Total Cost—
Frequently Asked Questions
Measure the length, width, and height of your room. Calculate the total wall area by adding the area of each wall, then subtract doors (21 sq ft each) and windows (15 sq ft each). Divide by the paint coverage rate of 350 sq ft per gallon, then multiply by the number of coats.
A standard gallon of paint covers approximately 350–400 square feet. For accuracy, this calculator uses 350 sq ft per gallon. Coverage can vary based on surface texture, color change, and application method.
Flat paint hides imperfections but is hard to clean. Eggshell has a slight sheen and is washable. Satin is durable for high-traffic areas. Semi-gloss is ideal for trim and kitchens. Gloss offers a shiny, durable finish for cabinets and doors.
Primer is recommended when painting over dark colors, bare drywall, wood, or metal surfaces. It improves adhesion, blocks stains, and ensures even coverage. This calculator estimates primer at one coat based on total wall area.
Trim paint is estimated based on the room's linear feet of baseboards and door/window casings. A standard room requires approximately 1 quart for trim. This calculator estimates trim paint assuming standard baseboard height and casing widths.