Basically, your debt income ratio measures the proportion of your monthly fixed payments (car payments, student loans, insurance, rent, etc.) to your monthly income before taxes. If your debt income ratio is too high, lenders may be cautious about lending you more money. A good range for debt income ratio is 30% to 35%.
Curious as to what your debt income ratio is? Visit http://www.debtconsolidationcare.com/calculator.html for a debt income ratio calculator and other useful tools.