Debt-to-Income (DTI) Calculator
Assess your borrowing profile using our free debt-to-income calculator. Measure your front-end and back-end DTI against Fannie Mae, Freddie Mac, and CFPB qualified mortgage underwriting standards.
100% Free to Use — Official US Lending Benchmarks
Monthly Obligations
DTI Worksheet
Total Back-End Debt-to-Income Ratio
35.6%
Ideal / Competitive (≤ 36%)
Meets standard Fannie Mae/Freddie Mac guidelines. You are well-positioned for favorable mortgage terms.
Housing DTI (Front-End)
25.9%
Benchmark: ≤ 28%
Total Monthly Debt
$3,025.00
All recurring debt
Remaining Cash Buffer
$5,475.00
Discretionary cash
Income & Debt Breakdown
Monthly Distribution
Housing Payment
Auto Loans
Student Loans
Remaining Buffer
Ad Placement — Mid Page
Understanding Debt-to-Income (DTI) in US Mortgage Underwriting
Your Debt-to-Income (DTI) ratio is one of the three primary pillars of mortgage underwriting, standing alongside your FICO credit score and down payment equity. It compares your total required monthly debt payments against your gross monthly income before taxes and payroll deductions.
US Lending Benchmark Tiers
- Under 36% (Ideal): Fully satisfies standard conventional loan requirements established by Fannie Mae and Freddie Mac. Borrowers in this tier receive the best interest rate pricing and smoothest underwriting approval.
- 37% to 43% (Manageable): Represents the upper boundary of the Consumer Financial Protection Bureau's (CFPB) definition of a Qualified Mortgage (QM). Widely acceptable with strong credit.
- 44% to 50% (High Risk / FHA): Exceeds standard conventional limits. While FHA and VA programs permit DTIs up to 50% through automated underwriting systems (AUS), lenders typically require compensating factors such as 6+ months of cash reserves.
- Over 50% (Critical): Disqualifies most borrowers from conforming mortgage financing. Applicants must pay down debt or document additional qualifying income.
Frequently Asked Questions About DTI
What debts are NOT included in my DTI calculation?
Underwriting guidelines do not include non-debt living expenses such as groceries, utilities (gas, electricity, water), cell phone bills, health insurance, cable streaming services, or voluntary retirement contributions. Only contractual debts appearing on your credit report are counted.
Does a low DTI guarantee loan approval?
No. While a low DTI is essential, lenders must also verify sufficient credit history, stable two-year employment history, sufficient down payment funds, and an acceptable property appraisal.