This video goes over what producer surplus is, and how to calculate producer surplus. More information on producer surplus and this video is available at http://www.freeeconhelp.com/2011/09/w...

The trick to calculating producer surplus is to remember that producer surplus is the area beneath the market price and above the marginal cost curve.

While producer surplus is NOT profit, it can be helpful to think of producer surplus as profit because it is the difference between the amount a firm is receiving and the price that it is paying to produce the individual unit of a good. (for those interested, producer surplus isn't equal to profit because it ignores fixed costs...).