Calculations for Determining How Much Paint You Will Need For Your Project

Uncertain how much paint you will need for your room? Learn how to do the calculations for determining the amount of paint for your project in this video by The Home Depot:

For a rectangular room:

1. Measure the perimeter of the room (Length x 2 + Width x 2).

2. Multiply the perimeter by the ceiling height to obtain the total square feet of wall that needs to be painted.

3. You will need to delete door and window space from this calculation. Measure the doors and windows and calculate their square footage, then subtract those numbers from your original calculation.

4. One gallon covers approximately 400 square feet. For a room of this size, for two coats, you will need two gallons of paint.

It’s a good idea to keep any leftover paint for future touch-ups.