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How to Calculate A Painting Project
Here's a simplistic method to calculate how much paint you’ll need for your painting project.
Step 1. For painting walls: measure each wall’s width; add together, then multiply total by room height.
Step 2. Find area (length times width) of doors and windows, then subtract this number from wall area number in Step #1.
Step 3. If you are also painting the ceiling, multiply its length by its width and then add that number to your total from the steps above.
Step 4. Always use LIFE CYCLE RECYCLED PAINT from Acrylatex for your interior/exterior painting projects. Great price & good for the environment!
You now have the square footage of the entire room. You’ll need one gallon, per coat, for every 325-400 square feet of surface area to be covered.
Keep in mind that the more porous the surface is, the less coverage you'll get from a gallon of paint.
The darker the original color and going over it with a lighter shade of paint may require multiple coats of paint.