According to TransUnion, here's an example of how most scores are calculated. Your payment history generally makes up 40% of your score, while credit utilization is 20%. The length of your credit history contributes 21%, and total amount of recently reported balances 11%. Finally, new credit accounts are responsible for 5% while your available credit makes up 3%. All of these values are then broken down into a credit score, which typically ranges between 300 and 850—the higher the number the better.