The basic difference between the two is the FICO score range. A fair credit score is between 580 and 669 while a good credit score ranges between 670 and 739. Being one level below good credit can make a huge difference when you apply for credit, as you could miss out on access to great offers on rewards, cash back and 0 percent interest cards. You could also end up paying higher interest when you borrow money with a fair credit score versus a good credit score.