How do I figure out the amount of paint I need for my project?

First, you need to determine the total square footage of the area you’re going to paint. The easiest way to do that is to add the length and width of your walls together and multiply by 2. Then take that number and multiply it by the height of your walls. That will give you the square footage of the paintable surface.

Example: If your room is 12’x14’, add 12 and 14. That gives you 26. (12 + 14 = 26) Now multiply 26 times 2. That gives you 52. (26 x 2 = 52) If you have 9’ ceilings, multiply 52 times 9. That gives you 468. (52 x 9 = 468) Your total paintable square footage is 468 sq. ft.

Once you’ve determined your square footage, you should plan on one gallon of topcoat for every 350 sq. ft. or one gallon of primer for every 250 sq. ft. of untreated or unpainted surface such as bare drywall, raw wood or masonry.

In the instance above, you should purchase two gallons of paint or primer. If your project needs more than one gallon of paint, mix all of the paint in a paint bucket before you begin. If there were slight variations in the tint of each gallon, this will blend them into one perfect color.

Check your state and local codes before starting any project. Follow all safety precautions. Every effort has been made to ensure the accuracy and safety of this information. Neither Westlake nor any contributor can be held responsible for damages or injuries resulting from the use of the information in this document.