How much paint will I need for an interior room?

A rule of thumb: Plan to use one gallon for every 400 square feet you’ll paint. If you prime your walls first, you’ll use less paint.

If the ceiling height is the same in all of the rooms you want to paint:

1. Measure the width of each wall.
2. Add all of those widths together.
3. Measure the height of one wall only.
4. Multiply the width total by the height.
5. Measure the area of your windows and doors (multiply length times width).
6. Subtract that number from the answer to No. 4.

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