Debt-to-Income Ratio Calculator
See exactly what lenders see when you apply for a mortgage or auto loan. Lower is better. Local calculation, zero uploads.
Calculated locally. Share links keep values after #.
These calculators provide estimates for educational purposes only. Results are not guaranteed and should not be treated as financial advice. Always consult a qualified professional before making major financial decisions.
Lenders use one number to decide whether to approve you for a mortgage, car loan, or credit card: your debt-to-income ratio. If your DTI is above 43%, most conventional loans are off the table. If it is below 36%, you are in the preferred zone. This single metric matters more than your credit score for certain loan types.
Read more - how it works, tips & FAQs
How to use this calculator
- Enter your gross monthly income before taxes (from all sources -- salary, bonuses, side income).
- Enter your total monthly debt payments: credit card minimums, auto loans, student loans, personal loans, mortgage, child support.
- The calculator instantly computes your front-end (housing only) and back-end (all debt) DTI ratios.
- See which zone you are in: green (<36%), yellow (36-43%), or red (>43%) with specific lender guidance for each.
How to calculate this by hand
DTI = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100
Include: mortgage/rent, car loans, student loans, credit card minimums, child support. Do not include: utilities, groceries, insurance, taxes. Front-end DTI = housing costs only. Back-end DTI = all debt. Most lenders look at back-end.
How DTI affects a mortgage application
- Monthly income: $7,000 gross
- Proposed mortgage payment: $1,800 (principal, interest, taxes, insurance)
- Existing debts: car $400, student loans $250, credit card minimums $150
- Housing DTI (front-end): $1,800 / $7,000 = 25.7% (under 28% limit)
- Total DTI (back-end): $2,600 / $7,000 = 37.1% (over 36%, under 43%)
- Result: likely approved but at a slightly higher rate than if DTI were under 36%
Result: A $200/month car payment drops your maximum affordable home price by roughly $35,000 at 6.5% rates.
Tips
- Lower DTI before applying for a mortgage: Pay off small credit card balances entirely. Even $500 paid off can drop your DTI by 2-4 points. Do not close the cards -- just zero out the balance. Lenders use the minimum payment on your credit report, so a $0 balance means $0 counted.
- Refinance to lower monthly payments: Refinancing a car loan from 9% to 6% on a $25,000 balance saves about $40/month. That $40 directly lowers your DTI by ~0.5%. Every dollar counts when you are close to the 43% ceiling.
- Avoid new debt in the 6 months before applying: Lenders look at your current monthly obligations. A new car loan adds $400-700/month to your DTI calculation. Wait until after closing on major purchases. Even 0% financing counts as a monthly payment for DTI purposes.
- Include all sources of income: Lenders can count bonus, overtime, commission, and side income if it has been consistent for 2+ years. Self-employment income is averaged over 2 years. Do not leave money on the table -- document all income sources.
Common mistakes to avoid
- Confusing DTI with credit score - You can have a 780 credit score and be denied for a mortgage because your DTI is 50%. Lenders evaluate both separately. Check your DTI before you start house hunting, not after.
- Only calculating housing DTI - Lenders care about your TOTAL debt picture. A $0 car payment and $0 student loans make a huge difference. Count everything with a monthly payment -- even buy-now-pay-later plans like Affirm and Klarna show up on mortgage applications.
- Ignoring DTI after getting the loan - A high DTI leaves no room for financial shocks. Even after you get the mortgage, keeping DTI under 36% protects you from life events. Losing a job or having a medical emergency is harder to survive when 50%+ of income goes to debt.
DTI Thresholds by Loan Type (2026)
| Loan Type | Front-End Max | Back-End Max | Notes |
|---|---|---|---|
| Conventional (Fannie/Freddie) | 28% preferred | 36% / 43% max | Above 43% requires strong compensating factors |
| FHA Loan | 31% | 43% / 50% max | Above 43% requires manual underwriting |
| VA Loan | Not used | 41% standard | Residual income test applies |
| USDA Loan | 29% | 41% / 44% max | Geographic + income limits apply |
| Jumbo Loan | 28% | 36-38% typical | Lender-specific, stricter |
FAQ
What is the difference between front-end and back-end DTI?
Front-end DTI only includes housing costs (mortgage principal, interest, taxes, insurance, HOA fees). Back-end DTI includes ALL monthly debt payments including housing. Lenders look at both, but the back-end ratio is usually the binding constraint.
Does my credit card limit count in DTI?
No. DTI only counts the actual monthly payment, not the available credit. If your minimum payment is $35 on a $5,000 balance, only $35 counts toward DTI. However, lenders may consider the full balance if it is unusually high relative to the limit.
Can I get a mortgage with a 50% DTI?
Some government-backed loans (FHA, VA) allow DTIs up to 50-55% with strong compensating factors like excellent credit, large down payment, or significant cash reserves. Conventional loans rarely go above 45%. You will pay higher rates at the upper limits.
Related resources
- What You Can Afford with a Home Affordability Calculator - Use a home affordability calculator to find your real price range.