How to use Debt-to-Income Calculator
This debt-to-income (DTI) calculator shows the ratio lenders use to judge how much of your monthly income already goes toward debt. Enter your monthly housing cost, your other debt payments and your gross monthly income to get both the front-end ratio (housing only) and the back-end ratio (all debts). A clear rating and a guideline table help you see where you stand against the limits mortgage lenders typically apply.
- Enter your total monthly housing cost (rent or mortgage, taxes and insurance).
- Add your other monthly debt payments such as car, student and credit-card minimums.
- Enter your gross (pre-tax) monthly income.
- Read your front-end and back-end DTI percentages.
- Compare your ratios against the lender guideline bands.
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Front-end versus back-end DTI
The front-end ratio divides only your housing costs by gross monthly income, while the back-end ratio divides all recurring debt payments — housing plus car loans, student loans and credit-card minimums — by the same income. Lenders weigh the back-end ratio most heavily because it reflects your full obligations. Both use gross income rather than take-home pay, which is why your DTI can look lower than the share of your actual paycheck that debt consumes.
| Rating | Front-end | Back-end |
|---|---|---|
| Excellent | under 28% | under 36% |
| Acceptable | 28%–35% | 36%–43% |
| High | over 35% | over 43% |
Why DTI matters for borrowing
A lower DTI signals that you can comfortably take on a new payment, so it improves your odds of approval and can earn you a better interest rate. Many conventional mortgages cap the back-end ratio around 43%, though some programs stretch to 50% with strong credit and reserves. If your ratio is high, paying down revolving balances or boosting income before applying can move you into a better band and widen your loan options.
Worked examples
Comfortable
Inputs: housing $1,400 · debts $600 · income $5,000
Result: 28% front · 40% back
Tight
Inputs: high debts vs income
Result: Back-end over 43% flagged high
Glossary
- DTI
- Debt-to-income ratio — monthly debt payments as a percentage of gross income.
- Front-end ratio
- Housing costs as a percentage of gross monthly income.
- Back-end ratio
- All monthly debt payments as a percentage of gross monthly income.
- Gross income
- Income before taxes and deductions, used by lenders for DTI.
- Revolving debt
- Open credit such as credit cards, where balances and minimums vary.
Related reading
Frequently Asked Questions
Why use Debt-to-Income Calculator?
- Calculates both front-end and back-end DTI ratios simultaneously, exactly as lenders do
- Color-coded rating bands show at a glance whether your ratio is excellent, acceptable or high
- Models the effect of paying off one specific debt on your overall DTI before applying
- Uses gross income to match the exact metric lenders apply during mortgage underwriting
Common use cases
- Check your DTI before applying for a mortgage to avoid triggering an automatic rejection
- See how paying off a car loan first would improve your overall debt-to-income standing
- Find the maximum housing payment that keeps your back-end DTI under the 43% threshold
- Compare your DTI before and after a pay rise or the addition of a second earner
- Prioritize which debts to pay down first to move into a better DTI band before borrowing
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