How to use surface area in order to figure out how much paint you will need when you are painting anything. I always run out of paint whenever I have a job to do and I hate having to make multiple trips to Home Depot. If you know how to calculate surface area, then you can have a clear estimate of how much paint you will need for a particular job. Jump to: Example 1: 2:24 Exampe 2 (Practice): 5:33 Follow me on Twitter: twitter.com/mathodman20 Follow me on Facebook: www.facebook.com/pages/Mathodman20/366316640049360