Paint Calculator

Calculate exactly how much paint you need for walls, ceilings, and trim with pro-grade accuracy.

Room Dimensions

Unit System

Surface Area (sq ft)

sq ft

Number of Coats

Coverage (sq ft / gal)

Paint Requirements

Time for a fresh coat?

Enter your wall dimensions to see exactly how much paint you'll need for your project.

Overview

Calculating paint requirements ensures you buy enough for the job without excessive waste. Most standard paints cover between 350 and 400 square feet per gallon on a smooth surface. Proper estimation prevents mid-project trips to the hardware store and saves money.

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Pro Tips

Porous surfaces like new drywall or masonry will absorb more paint and may require a primer first.
Subtract ~21 sq ft for each standard door and ~15 sq ft for each standard window.
Darker colors often require more coats (3 or 4) to achieve full opacity and depth.

Fun Facts

"Paint was first used by early humans for cave drawings, often using mixtures of dirt, charcoal, and animal fat."
"The world's most expensive paint color is Lapis Lazuli, which historically cost more than gold."
"In the middle ages, painters used egg yolk as a binder for pigment, known as egg tempera."

Formula: Gallons = (Area × Coats) / Coverage per Gal

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