This post is really so I can remember what to do when I need to figure out how much paint I need to paint a room.
The formula is quite simple but if you don’t have it in front of you then you will just be guessing.
Add all the walls widths in feet that you want to paint, multiply the total by the rooms height and then divide the total by 350 (the square footage a gallon of paint usually covers) and then you have how many gallons of paint you will need to paint your room.
Width of walls in feet (X) rooms height (/) 350 = Total Gallons of paint.
I hope this helps you as well to figure out how much paint you need.
( If you are reading this anywhere but my blog, you can find the original post here. )