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Paint Calculator

Calculate how much paint you need for a room in gallons or liters, from wall size, doors, windows and coats. Ceiling optional. Free paint calculator.

Paint needed
2.09 gallons
Area to paint
366 sq ft
Gallon cans
3
In quarts
9
Coats
2

Based on one gallon covering about 350 sq ft (a liter about 10 m²). Check the can: textured walls take more.

How much paint to buy

Wall area = the room's perimeter × wall height, minus doors (about 20 sq ft each) and windows (about 15 sq ft). A 14 × 12 ft room with 8 ft walls, one door and two windows has 366 sq ft of wall. One gallon covers about 350 sq ft per coat, so two coats need about 2.1 gallons: buy 3 gallon cans, or 2 gallons and a quart. In metric, a liter covers about 10 m². Rough or porous surfaces and big color changes need more.

How to use it

  1. 1

    Enter the room size

    Length, width and wall height.

  2. 2

    Count doors and windows

    And choose the number of coats.

  3. 3

    See how much paint

    Gallons or liters, and how many cans to buy.

Frequently asked questions

How much does a gallon of paint cover?

About 350–400 sq ft per coat on smooth walls.

Do I need two coats?

Usually, yes, for even color, especially over a different color or new drywall.

How much paint for a ceiling?

Its area is length × width. Choose 'Yes' to include it.

Is anything stored?

No. The calculation runs in your browser.

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