Your debt to income ratio is a percentage used to describe how much you make compared to how much you spend.

For example, if a person makes $1,000 per month but spends $500, that person has a 50% (or 2:1) debt ratio.

You should only have a maximum of 36% of your monthly income tied up in monthly payment debts.
Any number higher than this and going into debt is likely.

Information from Lending Tree Financial Services.