Are there any sites online that have a simple example for calculating standard deviation? I've had no luck trying to find something like this.

Depends. What kind of formula are you looking for? What do you have in order to calculate the std?

Wikipedia does, actually.

See section 1.3.1:

Standard deviation - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Standard_deviation)

Standard Deviation Formula (http://standard-deviation.appspot.com/)