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Debt-to-Income Ratio Calculator

Calculate your debt-to-income ratio, a key metric lenders use to assess affordability.

Result

Debt-to-Income Ratio
30%
Rating
Healthy
403020100DTI %: 36DTI %: 30Lender Threshold (36%)Your DTI

About the Debt-to-Income

Debt-to-income ratio is one of the first numbers lenders check when evaluating a mortgage, auto loan, or other credit application - it measures how much of your income is already committed to debt payments. Our Debt-to-Income Calculator shows your DTI and how it stacks up against common lending thresholds.

How It Works

The calculator divides your total monthly debt payments (mortgage or rent, car loans, student loans, credit card minimums, and any other recurring debt) by your gross monthly income, then rates the result against the thresholds lenders commonly use: 36% or below is generally considered healthy, up to 43% is borderline, and above that is considered high.

DTI = total monthly debt payments ÷ gross monthly income × 100

Formula & Methodology

Lenders use DTI as a proxy for how much financial cushion a borrower has to absorb a new payment - it's calculated on gross (pre-tax) income specifically because that's the standardized figure available on tax returns and pay stubs, making it consistent to verify across every applicant regardless of their specific tax situation. The commonly cited thresholds (36% comfortable, 43% often the maximum for a qualified mortgage) come from historical default-rate research showing borrowers above those levels default more frequently.

Step-by-Step: Calculating It By Hand

  1. 1List all recurring monthly debt payments: mortgage or rent, auto loans, student loans, credit card minimums, and any other debt.
  2. 2Sum those payments for total monthly debt.
  3. 3Divide total monthly debt by gross (pre-tax) monthly income.
  4. 4Multiply by 100 to express the result as a percentage, then compare against common lending thresholds.

Examples

Healthy DTI

$1,800 in monthly debt payments against $6,000 gross monthly income gives a DTI of 30% - comfortably within the healthy range most lenders look for.

High DTI

The same $6,000 income with $2,800 in monthly debt payments pushes DTI to 46.7%, likely making it harder to qualify for additional credit.

Advantages

  • Uses the exact ratio lenders actually check during underwriting
  • Rates your result against commonly used lending thresholds
  • Helps identify whether paying down existing debt would meaningfully improve loan eligibility
  • Quick enough to check before applying for a mortgage or other major loan

Common Mistakes

  • Using net (take-home) income instead of gross income, which lenders use for this calculation
  • Forgetting to include all recurring debt payments, not just the largest ones
  • Not recalculating DTI before a major purchase after taking on new debt
  • Assuming a DTI under 43% guarantees loan approval - it's one factor among several lenders consider

Edge Cases to Watch For

  • Front-end DTI (housing costs only) and back-end DTI (all debt, including housing) are different figures - lenders typically care most about back-end DTI, which is what this calculator computes.
  • Utility bills, insurance, groceries, and other non-debt living expenses aren't included in DTI, even though they affect real affordability.
  • Different loan programs (conventional, FHA, VA) allow different maximum DTI thresholds, so 'too high' depends on which loan type is being pursued.
  • A DTI at or below the threshold doesn't guarantee approval - credit score, employment history, and cash reserves are evaluated alongside it.

Common Use Cases

  • Checking loan eligibility before applying for a mortgage or major loan
  • Understanding how much room is left before taking on additional debt
  • Deciding whether to pay down existing debt before a big purchase
  • Comparing your DTI against common lending thresholds
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

What DTI do lenders typically want?

Most mortgage lenders prefer a DTI at or below 36%, though some loan programs allow up to 43-50% with compensating factors like a large down payment or excellent credit.

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Conclusion

A lower DTI doesn't just help you qualify for loans - it generally means more monthly cash flow and less financial stress overall. If your DTI is higher than you'd like, our Debt Payoff and Debt Consolidation calculators can help map out a path to bring it down.

References