
01Total Your Monthly Debt
Your debttoincome ratio is calculated by dividing your monthly income by your monthly debt payments.
DTI = monthly debt / monthly income
The first step in calculating your debttoincome ratio is determining how much you spend each month on debt.
To start, add up what you spend each month on debt, including the following:
 Mortgage or rent
 Minimum credit card payments
 Car loan
 Student loans
 Alimony/child support payments
 Other loans
Example:
Let's assume Sam has the following debt expenses:
 mortgage = $950
 minimum credit card payments = $235
 car loan = $355
$950 + $235 + $355 =
Sam's total monthly debt payments = $1,540 
02Total Your Monthly Income
The next step to determining your debttoincome ratio is calculating your monthly income.
Start by totaling your monthly income. Add up the amount you receive each month from:
 Gross income
 Bonuses or overtime
 Alimony/child support
 Other income
Example
Remember, Sam spends $1,540 each month on debt payments. This is what he receives in income each month.
 annual gross income = $3,500
 child support = $500
Sam's total annual income = $3,500 + $500 = $4,000.
Note: Multiply a weekly income by 4 and bimonthly income by 2 to calculate your monthly income. Or, if you know your annual salary, divide by 12 to get your monthly income.

03Calculate Your Debt To Income Ratio
Once you've calculated what you spend each month on debt payments and what you receive each month in income, you have the numbers you need to calculate your debttoincome ratio. To calculate the ratio, divide your monthly debt payments by your monthly income. Then, multiply the result by 100 to come up with a percent.
Example
In our example, Sam's monthly debt payments total $1,540 and his monthly income total $4,000. So, let's divide $1,540 by $4,000 and then multiply by 100.
$1540 / $4000 = .385 X 100 = 38.5%
Sam's debt to income ratio is 38.5%. 
04What Your Debt To Income Ratio Means
Your final result will fall into one of these categories.
36% or less is the healthiest debt load for the majority of people. If your debttoincome ratio is within this range, avoid incurring more debt to maintain a good ratio. You may have trouble getting approved for a mortgage with a ratio above this amount.
37%42% isn't a bad ratio to have, but it could be better. If your ratio falls in this range, you should start reducing your debts.
43%49% is a ratio that indicates likely financial trouble. You should start aggressively paying your debts to prevent an overloaded debt situation.
50% or more is an extremely dangerous ratio. This means that more than half of your income is going toward debt payments. You should be aggressively paying off your debts. Don't hesitate to seek professional help.
Example
In our example, Sam's debt to income ratio is 38.5%. This isn't a bad ratio, but it could become worse if Sam increases his monthly debt payments without increasing his income.
How To Calculate Your Debt To Income Ratio
Your debttoincome (DTI) ratio is the percentage of your monthly income that goes toward paying your debt. It's important not to confuse your debtincome ratio with your credit utilization which is the amount of debt you have relative to your credit limits.
Many lenders, especially mortgage and auto lenders, use your debttoincome ratio to figure out the loan amount you can handle based on your current income and the amount you're already spending on debt. For example, a mortgage lender will use your debttoincome ratio to figure out the mortgage payment you can afford after all your other monthly debts are paid.
You, too, can calculate your debttoincome ratio to figure out how much you're spending debt each month.