What is a Confederate 5 dollar bill worth?

Assuming it's genuine, the value of a five dollar Confederate bill will fluctuate. Currently, it is available via resale markets with a price range of 20 to 30 dollars per bill.

However huge numbers of "Confederate" bills are actually replicas that were sold by gift shops at Civil War sites, printed for use in advertising campaigns, etc. You'll need to have your bill authenticated in person by an expert dealer or appraiser.