📐 Materials Calculator

How much do you need?

Enter your room size for a quick materials estimate.

Estimate only — rounded up, based on standard coverage rates (drywall +10% waste; paint ~350 sq ft per gallon per coat). Confirm quantities before buying.

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Paint Calculator Questions

How much paint do I need for a room?

Measure the room length, width and ceiling height. Wall area = 2 × (length + width) × height; add length × width for the ceiling. One gallon of paint covers roughly 350 sq ft per coat, so multiply the area by the number of coats and divide by 350. The calculator above does this for you.

How many gallons of paint for a 12x12 room?

A 12×12 room with 8 ft ceilings has about 384 sq ft of wall. At two coats and 350 sq ft per gallon per coat, that's roughly 3 gallons — about 4 if you include the ceiling. Enter your exact numbers for a precise estimate.

Do I need primer?

New, bare or freshly patched drywall should be primed before painting. Plan for about one coat of primer (roughly 350 sq ft per gallon). The calculator includes a primer estimate.

How many coats of paint do I need?

Most jobs need two coats for even colour and coverage; a dramatic colour change may need three. Set the number of coats in the calculator to match your project.

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