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Debt-to-Income (DTI) Ratio Calculator
Enter your gross income and monthly obligations to see your DTI ratio, how lenders typically read it, and how much room you have left.
Last updated October 24, 2026
What DTI measures
Debt-to-income ratio divides your monthly debt obligations by your gross monthly income, before taxes and deductions. Lenders use it as a proxy for how much additional payment you can absorb. Two versions appear on mortgage applications:
- Front-end DTI counts only the housing payment — principal, interest, property tax, insurance, and HOA dues.
- Back-end DTI adds every other recurring obligation: auto loans, student loans, credit card minimums, child support, and personal loans.
Back-end DTI is the number that usually decides an application.
How lenders read the number
There is no single legal threshold, but the conventional bands are consistent across mortgage guidelines:
| Back-end DTI | Typical lender response |
|---|---|
| 36% or less | Comfortable; strongest pricing |
| 37%–43% | Widely acceptable for qualified mortgages |
| 44%–50% | Possible with compensating factors or specific programs |
| Above 50% | Usually declined for a new mortgage |
Those bands come from the Consumer Financial Protection Bureau's qualified mortgage framework and are echoed in the guidelines published by Fannie Mae and Freddie Mac. Individual lenders can be stricter, and some government-backed programs (FHA, VA, USDA) apply their own overlays.
The calculation, precisely
Back-end DTI = (housing + all other minimum debt payments) ÷ gross monthly income
Use minimum payments, not the balance, and use gross income, not take-home pay. Lenders do not generally count utilities, groceries, subscriptions, or insurance that is not housing-related. They do count court-ordered obligations and, in many cases, student loan payments — including an assumed payment for loans in deferment.
Self-employed applicants are usually assessed on adjusted gross income from tax returns rather than a stated monthly figure, which can produce a very different result.
Why the number can be misleading
It ignores your actual budget. A 35% DTI looks fine on paper but can feel tight if your non-debt expenses are high, such as childcare or medical costs.
It treats all debt equally. A $400 car payment and a $400 student loan count the same, even though one is an appreciating asset in some cases and the other may be income-contingent.
It changes without new borrowing. A rate reset, an escrow increase, or the end of a promotional period can move the ratio.
It is not a credit score. Payment history and utilization affect your score; DTI affects affordability underwriting. Both matter.
Improving your ratio
- Pay down revolving balances. A credit card minimum drops as the balance falls, which lowers the numerator directly.
- Avoid new installment debt before applying. A car loan taken mid-application can sink an approval.
- Increase documented income where legitimate — a raise, a second job with a history, or qualifying bonus income.
- Reduce housing cost by refinancing, removing mortgage insurance once eligible, or appealing an escrow overage.
- Do not close old accounts in an attempt to help. Closing a card can reduce available credit and raise utilization.
Limits of this calculator
It does not know your credit score, employment history, reserves, or the specific underwriting rules of a given lender. Treat the output as a screening tool: if your back-end DTI is comfortably under 43%, you are broadly in range; if it is over 50%, any new mortgage will be difficult regardless of other factors.
Sources and further reading
Frequently asked questions
- Should I use gross or net income?
- Gross income, before taxes and deductions. Lenders underwrite against gross monthly income.
- Does rent count toward DTI?
- Rent is not part of DTI on a standard application, but it is usually replaced by the proposed housing payment. Some lenders also review rental payment history.
- What is a good DTI for a mortgage?
- At or below 36% is strong, and up to 43% is broadly acceptable. Above that, approval depends on compensating factors and the specific loan program.
- Do student loans in deferment count?
- Often yes. Many lenders use a calculated payment — commonly 1% of the balance — even when the loan is in deferment or income-driven repayment.
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