Paint Calculator

Buying paint for a room? Enter dimensions, number of doors and windows, coats, surface type, and waste percentage — get gallons, liters, and estimated material cost before visiting the store. Surface type adjusts coverage: smooth drywall covers ~400 sq ft/gallon while textured walls or brick need more product per square foot.

Home improvement paint searches spike before every weekend project. High purchase intent — users are about to spend $30–$80 per gallon. Accurate estimates prevent mid-project store runs and help you budget primer, finish coat, and supplies in one trip.

Supports metric (meters) and imperial (feet) room measurements. Default 10% waste factor; increase to 15–20% for textured surfaces, vaulted ceilings, or first-time DIYers who may need touch-ups.

Do not forget ceiling paint if you are doing walls and ceiling — add ceiling square footage separately or include it in total wall area. One gallon typically covers 350–400 sq ft per coat on smooth interior drywall.

Free, instant, no account. Buy one extra quart for future touch-ups and store the label color code — paint batches can vary slightly between purchases.