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    Paint Calculator

    Calculate how much paint you need for a room with this free online paint calculator: walls, ceiling, doors, windows and coats, in gallons or liters.

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    Found it useful? Share Paint Calculator

    Free, no sign-up, works in the browser — send it to a friend or add it to your site.

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    How to use Paint Calculator

    1. 1Choose feet and gallons or meters and liters
    2. 2Enter the room length, width and wall height, the number of doors and windows and how many coats; tick the ceiling if you're painting it
    3. 3Press Calculate paint to see the area and how many cans to buy

    Frequently asked questions

    How much paint do I need for a 12×14 room?▾

    With 8 ft walls, one door and two windows there are about 366 ft² of wall. Two coats at 350 ft² per gallon need about 2.1 gallons, so buy 3 gallons (or a 5-gallon bucket if you're also doing other rooms).

    How much does a gallon of paint cover?▾

    Most interior paints cover 350–400 ft² per gallon per coat on smooth, primed walls (about 10 m² per liter). Textured or porous surfaces soak up more.

    How many coats of paint do I need?▾

    Two coats is standard for an even finish. One coat can work when repainting the same color; dark-to-light changes or fresh drywall may need primer plus two coats.

    How is the wall area calculated?▾

    Perimeter × wall height = 2 × (length + width) × height, minus about 20 ft² per door and 15 ft² per window. The ceiling adds length × width.

    Embed Paint Calculator on your website▾

    Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.