Debt to Income DTI Ratio Calculator
### CFPB & Fannie Mae Mortgage DTI Underwriting Standards The **Debt-to-Income (DTI) Ratio** is the primary metric lenders use to determine how comfortably a borrower can manage monthly mortgage.
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📐 Formula
💡 Practical Example
A borrower earning $7,500/month with $2,250 in housing and $975 in car/credit card payments has a 30% front-end DTI and 43% back-end DTI, exactly hitting the CFPB Qualified Mortgage (QM) underwriting threshold.
📖 About Debt to Income DTI Ratio Calculator
CFPB & Fannie Mae Mortgage DTI Underwriting Standards
The Debt-to-Income (DTI) Ratio is the primary metric lenders use to determine how comfortably a borrower can manage monthly mortgage payments alongside existing debt obligations:
- Front-End DTI (Housing Ratio):
Front-End DTI = Principal + Interest + Taxes + Insurance (PITI) + HOAGross Monthly Income × 100\%
- Back-End DTI (Total Debt Ratio):
Back-End DTI = Housing PITI + Auto Loans + Student Loans + Credit CardsGross Monthly Income × 100\%
Mortgage Program DTI Limits Table
- The Classical 28/36 Rule: 28% Front-End / 36% Back-End (ideal benchmark for the lowest interest rates).
- Conventional Conforming Loans: Up to 43% to 45% Back-End DTI (up to 50% with strong Desktop Underwriter automated approval and high credit score).
- FHA Loans: Standard 31% Front / 43% Back.
- VA Loans: Benchmark 41% Back-End DTI (allows higher with adequate residual income).
- CFPB Qualified Mortgage (QM) Standard: Statutory cap is 43% Total DTI.
How to Use This Calculator
Enter your Gross Monthly Pre-Tax Income () (e.g. 8000), Monthly Housing Payment (PITI + HOA) () (e.g. 1800), Other Monthly Debts (Auto, Cards, Student) () (e.g. 600), and Mortgage Underwriting Benchmark — choose from Custom Income & Debts, Ideal Conventional 28/36 (8k Income / 1,800 PITI / 600 Debt), Standard Conventional 43% (7.5k Income / 2,250 PITI / 975 Debt). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Conversion factors (to SI base unit or reference unit):
inc: 8000.0
minimumFractionDigits: 2
maximumFractionDigits: 2
Worked Example
A borrower earning 7,500/month with 2,250 in housing and 975 in car/credit card payments has a 30% front-end DTI and 43% back-end DTI, exactly hitting the CFPB Qualified Mortgage (QM) underwriting threshold.
Understanding Your Result
Percentages are relative values — context determines what is "good" or "bad." A 50% discount is significant; a 50% failure rate is alarming. Percentage change and percentage points are different: moving from 4% to 5% is a 1 percentage point increase, but a 25% relative increase. When comparing percentages across different base values, always check whether absolute differences are meaningful — a 10% improvement on a large base creates more absolute value than 10% on a small base.
💡 Methodological Standards & Calculation Accuracy
- All calculations are performed client-side in your browser using verified, standards-compliant mathematical algorithms.
- Results are provided for educational and informational analysis; verify critical applications with certified domain specialists.
- Ensure input values are entered in consistent units matching the selector options to guarantee accurate outputs.
- Periodic recalibration is recommended whenever baseline assumptions, operating parameters, or external conditions change.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.