Free debt-to-income ratio calculator
Calculate your debt-to-income ratio for mortgage qualification — enter gross monthly income and all monthly debt payments to see front-end and back-end DTI, updated live, as you type.
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Lenders calculate DTI slightly differently. Minimum payments are used for revolving debt. Consult a lender for exact qualification thresholds.
Results are estimates. Consult a professional.
How the debt-to-income ratio calculator works
Debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward recurring debt payments. Lenders use two versions: front-end DTI (housing costs only) and back-end DTI (all monthly debt obligations). The back-end DTI is the primary figure lenders evaluate when deciding whether to approve a mortgage, car loan, or personal loan.
Worked example: $6,000/mo income, four debt obligations
A borrower earns $6,000/month before taxes. Monthly obligations: mortgage $1,400, car loan $350, student loan $200, credit card minimum $100. They want to know if their DTI meets lender guidelines.
DTI ranges and lender approval likelihood
Lenders interpret DTI differently based on loan type and compensating factors, but these ranges reflect the general conventional mortgage and consumer lending standards used across the industry.
| DTI Range | Lender Rating | Typical Approval Outlook |
|---|---|---|
| Under 28% | Excellent | Strong approval; best rates likely available |
| 28%–36% | Good | Approvable by most lenders; competitive rates |
| 36%–43% | Acceptable | Qualifies for most conventional loans; may need stronger credit |
| 43%–50% | Marginal | May qualify with FHA or compensating factors; higher rate risk |
| Over 50% | High risk | Most conventional lenders decline; limited options available |
Source: Fannie Mae DTI guidelines; CFPB Qualified Mortgage rule (43% back-end cap for QM loans)
Tips for improving your DTI before applying
DTI is one of the few loan approval factors you can actively improve in the months before applying. Even small reductions make a meaningful difference in your rate tier and approval odds.
- Pay off small debts first — eliminating a $150/month minimum card payment drops your DTI by 2.5 percentage points on a $6,000 income; closing multiple small accounts adds up quickly.
- Avoid new debt before applying — taking out a car loan or opening a credit card in the 6 months before a mortgage application adds to your required minimum payments and directly raises DTI.
- Increase income with documented side income — freelance, rental, or part-time income can count toward gross income if you can show a two-year history on tax returns, lowering your DTI ratio.
- Make a larger down payment — a bigger down payment reduces the loan amount, which lowers the monthly housing payment and therefore both your front-end and back-end DTI.
- Ask about non-QM loans — borrowers with high DTI but strong assets or unusual income may qualify for non-Qualified Mortgage products; a mortgage broker can identify these options.
Accuracy and limitations
This calculator uses gross monthly income (before taxes) and required minimum monthly payments — the same inputs lenders use. It does not account for alimony, child support, or self-employment income adjustments that lenders sometimes apply. DTI thresholds vary by lender, loan program, and compensating factors such as credit score, down payment, and cash reserves. Government-backed loans (FHA, VA, USDA) often have different DTI limits than the conventional guidelines shown here.
Not financial advice — consult a financial professional for your specific situation.
DTI terms defined
About this debt-to-income ratio calculator
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