Everyone who has a credit card has a debt-to-limit ratio. It is a measure of your total available credit against how much credit is being used. This ratio is used as part of your credit score calculation. The more debt you have as compared to your available credit, the higher your debt-to-limit ratio. Calculating Debt-to-Limit Ratio The debt-to-limit ratio is calculated by dividing your total outstanding debt by the total amount of credit available to you. For instance, if you have one credit card with a $10,000 available line of credit...