Your total monthly income before taxes and deductions.
Monthly Debt Payments
Personal loans, alimony, child support, or other recurring obligations.
Your Results
Enter your income and debts, then click calculate.
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What This Calculator Does
This debt-to-income ratio calculator helps individuals and lenders evaluate borrowing capacity by comparing monthly debt payments to gross monthly income. It calculates both the front-end ratio (housing costs only) and the back-end ratio (all debt obligations). Lenders use DTI as a primary qualification metric for mortgages, auto loans, and personal loans. The calculator references 2026 Qualified Mortgage and conventional lending guidelines.
The Formula
The front-end ratio focuses on housing costs including mortgage principal, interest, taxes, and insurance (PITI). The back-end ratio includes all recurring debt obligations: housing, car loans, student loans, credit card minimums, and other monthly payments. Lenders evaluate both ratios, with the back-end ratio being the primary qualification metric.
Step-by-Step Example
Enter gross monthly income
Your total income before taxes and deductions. Example: $6,000 per month ($72,000 annual salary).
Enter monthly housing payment
Mortgage or rent payment. Example: $1,500 per month.
Enter all other debt payments
Car payment ($400), student loans ($300), credit card minimums ($150). Total non-housing debt: $850.
Review DTI ratios
Front-end: $1,500 / $6,000 = 25%. Back-end: $2,350 / $6,000 = 39.2%. This falls within the acceptable range for most conventional loans.
Real-World Use Cases
Mortgage Pre-Qualification
Determine your approximate borrowing capacity before applying for a home loan by checking whether your DTI meets lender thresholds.
Debt Reduction Planning
Identify how much debt you need to pay down to qualify for better loan terms or a lower interest rate.
Lending Risk Assessment
Loan officers and underwriters use DTI as a key metric to evaluate borrower risk and set loan terms.
Common Mistakes to Avoid
Using net (after-tax) income instead of gross (before-tax) income. Lenders always use gross income for DTI calculations.
Forgetting to include all recurring debt payments such as personal loans, alimony, child support, or co-signed obligations.
Not accounting for property taxes and insurance in the housing payment when calculating front-end DTI for a potential mortgage.
Assuming a low DTI guarantees loan approval. Lenders also consider credit score, employment history, down payment, and reserves.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides estimates based on 2026 lending guidelines. Actual loan qualification depends on credit score, employment history, down payment, reserves, and lender-specific requirements. DTI is one of many factors in the underwriting process. Consult a licensed mortgage professional for personalized advice.
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