Finance & MoneyUnderwriting
Debt-to-Income (DTI) Ratio Calculator
Assess your financial leverage and mortgage borrowing power by calculating your Front-End and Back-End Debt-to-Income (DTI) ratios.
Income & Monthly Debts
Total Back-End DTI Ratio
34.4%
Status: Good (Standard Max: 36% - 43%)
Front-End Housing Ratio:25% (Standard: ≤28%)
Total Monthly Debt Obligations:$2,750.00
Remaining Monthly Cashflow:$5,250.00
Mathematical Formula: Back-End DTI Ratio
DTI = (Total Monthly Recurring Debt / Gross Monthly Income) × 100
The standard underwriting benchmark used by Fannie Mae, Freddie Mac, and commercial banks.
How to Use This Calculator
- 1Enter your total gross monthly income before taxes.
- 2Enter your projected monthly mortgage payment or rent.
- 3Add recurring monthly debt obligations (car loans, student loans, credit card minimums).
- 4View your front-end and back-end ratios along with lender approval risk status.
Practical Example: Mortgage Applicant DTI
Scenario: $8,000 monthly income with $2,000 mortgage, $400 car payment, and $200 student loan.
Gross Income:$8,000/mo
Housing Payment:$2,000/mo
Other Debts:$600/mo
Result: Front-End DTI: 25.0% | Back-End DTI: 32.5% | Status: Good / Qualified
32.5% back-end DTI is safely below the standard 36% conventional mortgage threshold.
Frequently Asked Questions
Lenders generally prefer a front-end ratio of 28% or less and a back-end ratio of 36% or less (the 28/36 rule). Some programs allow up to 43% or 50% under FHA rules.
Pro Calculation Tips
- Keeping your total DTI below 36% gives you access to the lowest mortgage interest rates.
Model Assumptions
- Does not include living expenses like groceries, utilities, or gas.