Your credit score is your key to loans, leases and other life necessities. In most cases, you need a credit rating of "fair" or better to secure a loan. A "fair" FICO score is 650. FICO Scoring Your credit history determines your FICO score. The Fair Isaac Corporation credit score is determined based on a person's history of defaulting on payments, her current debt-to-credit ratio, the type of debt (student loans versus credit card charges)...