There are five categories that are calculated by FICO when determining your credit score. Your payment history will count for thirty-five percent (35%) of your credit score. The balances you owe to your creditors will make up thirty percent (30%) of your score. Fifteen percent (15%) of your score will be determined by the length of time that you have had credit. Finally, both the type of credit you have - mortgage loans, vehicle loans, and store credit cards, etc. - and the amount of new credit that you have will each count for ten percent (10%) of your score.