Calculator
Enter your income and debts, then click Calculate DTI to see your results.
How to Calculate Debt to Income Ratio
The debt-to-income ratio (DTI) compares your recurring monthly debt payments to your gross monthly income.
Formulas
Back-End (Total) DTI % = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100
Front-End (Housing) DTI % = (Monthly Housing Payment ÷ Gross Monthly Income) × 100 (mortgage mode only)
Worked Example
Gross monthly income: $6,500. Proposed housing payment: $1,800. Car payment: $450. Student loan: $300. Credit card minimums: $150.
- Non-housing debt = $450 + $300 + $150 = $900
- Total monthly debt = $1,800 + $900 = $2,700
- Front-end ratio = $1,800 ÷ $6,500 = 27.69%
- Back-end ratio = $2,700 ÷ $6,500 = 41.54%
You can reproduce this in the calculator above by entering $6,500 income, $1,800 housing, and the three debt payments.
Annual Income Conversion
If you know your annual income, divide by 12. Example: $78,000 ÷ 12 = $6,500 monthly.
What Counts and What Does Not Count as Debt
✓ Counts Toward DTI
- Mortgage payment (principal, interest, taxes, insurance, HOA, mortgage insurance) or rent
- Auto loan payments
- Student loan payments
- Credit card minimum payments
- Personal loan payments
- Child support or alimony paid
- Other court-ordered recurring payments
✗ Does Not Count Toward DTI
- Utilities (electric, water, gas, internet, phone)
- Food and groceries
- Insurance not tied to a loan (health, life, auto insurance premiums)
- Taxes (income tax, property tax if not in mortgage payment)
- Discretionary spending (entertainment, dining, subscriptions)
- Savings and retirement contributions
Based on CFPB guidance on debt-to-income ratio. Lenders may have additional requirements.
Common Mistakes
- Using net income instead of gross: DTI uses income before taxes and deductions.
- Forgetting credit card minimums: Use the minimum payment shown on your statement, not what you actually pay.
- Including non-debt expenses: Utilities, groceries, and insurance premiums are not debts for DTI.
- Double-counting housing: In mortgage mode, enter your full housing payment once. Do not also add it as a separate debt row.
- Using annual income without converting: Select "Annual" in the calculator or divide by 12 yourself.
- Assuming a ratio guarantees approval: Lenders consider credit score, assets, employment history, and other factors.
Frequently Asked Questions
- How is debt to income ratio calculated?
- DTI is calculated by dividing your total recurring monthly debt payments by your gross monthly income, then multiplying by 100 to get a percentage. For mortgage applications, lenders also calculate a front-end ratio (housing payment divided by gross monthly income) and a back-end ratio (total monthly debt divided by gross monthly income).
- How do I calculate my debt to income ratio?
- Add up all your monthly debt payments (mortgage or rent, auto loans, student loans, credit card minimums, personal loans, child support/alimony, other recurring debts). Divide that total by your gross monthly income (before taxes). Multiply by 100. Example: $2,700 total debt / $6,500 income = 41.54%.
- What counts as debt for DTI?
- Recurring monthly debt payments count: mortgage/rent, auto loans, student loans, credit card minimum payments, personal loans, child support or alimony paid, and other court-ordered payments. Utilities, food, insurance not tied to a loan, taxes, and discretionary spending do not count as debt for DTI.
- What is a good DTI ratio?
- Lenders set their own limits. Common benchmarks cited by the CFPB and mortgage agencies suggest a back-end DTI at or below 43% for many qualified mortgage programs, and a front-end ratio at or below 28% for housing. However, automated underwriting systems may allow higher ratios with compensating factors. Always check with your lender.
Glossary
- Gross Monthly Income
- Income before taxes, deductions, and withholding. For DTI, this includes wages, salary, tips, commissions, and other regular income.
- Front-End Ratio
- Housing payment divided by gross monthly income. Also called the housing ratio.
- Back-End Ratio
- Total monthly debt payments divided by gross monthly income. Also called the total debt ratio.
- PITI
- Principal, Interest, Taxes, and Insurance — the components of a typical mortgage payment.
- Qualified Mortgage (QM)
- A mortgage category with certain consumer protections. DTI limits for QM have changed; consult current CFPB rules.
- Automated Underwriting System (AUS)
- Software used by lenders (e.g., Fannie Mae DU, Freddie Mac LP) that evaluates loan applications and may allow DTI above standard limits with compensating factors.
Related Calculators
Official References
- Consumer Financial Protection Bureau (CFPB) — Debt-to-Income Ratio
- Fannie Mae Selling Guide — Debt-to-Income Ratios
- HUD — FHA Single Family Housing Policy Handbook 4000.1
- VA — Home Loan Lender Guidance
- eCFR — 12 CFR Part 1026 (Regulation Z Ability-to-Repay/Qualified Mortgage)
Last checked: 2026-10-18. Rules and guidelines change; verify with the official source before making financial decisions.
Limitations and Assumptions
- This calculator uses the standard DTI formula. Lenders may define income and countable debts differently.
- No approval, qualification, or eligibility verdict is provided. Lenders make the final decision.
- Program-specific DTI limits (Fannie Mae, FHA, VA, USDA) are not modeled because they vary and change. Automated underwriting may allow different ratios.
- Self-employment income averaging, rental income treatment, residual income tests, and tax withholding are not included.
- Credit score effects, interest rate quotes, and loan terms are outside the scope of this calculator.
- All results are educational estimates, not financial, tax, or legal advice.
