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Debt Calculators

Debt-to-Income Ratio Calculator

Calculate the front-end and back-end debt-to-income ratios lenders use to evaluate mortgages and personal loans.

Uses the standard front-end (housing) and back-end (total debt) DTI definitions used by US mortgage underwriters.

$
$
$
Back-end DTI
31.3%
Rating: Good. Total monthly debt: $2,500.
Front-end DTI (housing only)
22.5%
Back-end DTI (all debts)
31.3%
Total monthly debt
$2,500
Lender rating
Good
Explain this result

Turn the numbers above into plain-language takeaways. Educational only — not financial advice.

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Save the current inputs under a name, then reload or compare them side by side. Scenarios stay on this device only.

Overview

How the DTI Ratio Calculator Works

Debt-to-income (DTI) ratio is the single most important number lenders look at after credit score. It compares your monthly debt payments to your monthly gross income. This calculator shows both ratios lenders care about and rates your overall position from Excellent to High Risk.

Formula

The Math Behind the Calculator

Front-end DTI = (Housing payment ÷ Monthly gross income) × 100. Back-end DTI = ((Housing payment + Other monthly debts) ÷ Monthly gross income) × 100. Most conventional mortgages cap back-end DTI around 43%–50% with compensating factors.

Example

A Worked Example

A household earning $8,000/month gross with a $1,800 mortgage payment and $700 in other monthly debts has a front-end DTI of 22.5% and a back-end DTI of 31.3% — comfortably in the Good range for most lenders.

How to use

How to Use the DTI Ratio Calculator

  1. 1Enter your monthly gross (pre-tax) income — include reliable bonuses or self-employment income.
  2. 2Enter your full housing payment (PITI: principal, interest, taxes, insurance, HOA, PMI).
  3. 3Add up minimum monthly payments on car loans, student loans, credit cards, child support, and any other recurring debt.
  4. 4Compare the resulting ratios to your lender's published guidelines.
Interpretation

What the Results Mean

  • Front-end ratio of 28% or less is conservative and unlocks the best mortgage terms.
  • Back-end ratio under 36% is comfortable; 36%–43% is acceptable with good credit; above 43% is hard to approve for conventional loans.
  • A high DTI doesn't just affect approval — it leaves no margin for emergencies or rate increases.
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Smart Next Steps

What to explore next
Avoid

Common Mistakes to Avoid

  • Using take-home pay instead of gross income — lenders use gross.
  • Forgetting to include the minimum payment on every credit card, even ones you pay in full each month.
  • Including the spouse's income on the application but not their debts (or vice versa).
Keep going

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FAQ

Frequently Asked Questions

What DTI do I need for a mortgage?+

Most conventional loans require back-end DTI under 43%–45%. FHA loans sometimes allow up to 50% with compensating factors. Lower is always better.

Do utilities count toward DTI?+

No. DTI uses debt payments only — utilities, groceries, insurance premiums (other than escrowed homeowner's), and subscriptions don't count.

How can I lower my DTI quickly?+

Pay down credit card balances, refinance a high-rate auto loan to a lower payment, or increase documented income. Avoid taking on any new debt before applying.

Financial Disclaimer

This calculator is for educational and estimation purposes only. It does not provide financial, mortgage, tax, investment, or legal advice. Actual rates, payments, taxes, fees, insurance costs, eligibility, and loan terms vary by lender, location, credit profile, and market conditions. Always compare official offers and consult a qualified professional before making financial decisions.

Last updated June 2026 · Prepared by the mCalculator Editorial Team