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Debt-to-Income Ratio Calculator
Divides housing costs and total monthly debt by gross monthly income to report front-end and back-end DTI percents and compare them with user-set teaching guidelines.
Limitation: Educational ratio worksheet only—not credit advice, underwriting, or a promise of loan approval.
How to Calculate Front-End and Back-End DTI
Use gross monthly income consistently so ratios match common teaching definitions.
Enter gross monthly income.
What to leave out
Utilities, groceries, childcare, and retirement contributions are usually not debt payments for DTI—even though they matter for cash flow.
What the DTI Result Means
Primary output is back-end DTI. Details include front-end DTI, total monthly debt, and guideline status. Percents are undefined when gross income is zero.
DTI Examples
Under teaching 28/36
Income and debt inputs
Back-end DTI
Total debts 2,600 on 8,000 income.
Back-end over guideline
Income and debt inputs
Back-end DTI
2,100 total debts exceed 36% of 5,000.
After you calculate
If back-end DTI is high, explore debt payoff order with the debt snowball tool and re-check housing with the house or rent affordability worksheets.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorDebt-to-Income Formulas
No credit bureau data or lender overlays are applied.
Formula
Front-end DTI
monthly housing costs ÷ gross monthly income × 100
Back-end DTI
(housing + other debts) ÷ gross monthly income × 100
Total monthly debt
housing + other debt payments
Scientific Background
Assumptions: user-classified housing vs other debts, gross income base, teaching defaults often cited near 28/36 for conventional talking points. Limitations: residual income, student-loan calculation methods, and program-specific caps vary. Not underwriting.
Sources & review
Debt-to-Income Ratio Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
Consumer financial tools
Consumer Financial Protection Bureau (CFPB)
https://www.consumerfinance.gov/ask-cfpb/what-is-a-debt-to-income-ratio-en-1791/Free Calculator Hub methodology
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