Debt-to-Income Calculator

This calculator computes both your front-end DTI (housing costs only) and back-end DTI (every monthly debt), then checks each against conventional, FHA, and VA lending guidelines so you can see exactly where you stand and how much room remains.

For personal planning only — not financial advice.

Reviewed by CalculatorDrive Finance Editorial Board · Last updated

Your Details

Monthly Income

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Housing Costs (PITI)

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Other Monthly Debts

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Enter your income, housing costs, and monthly debts, then click Calculate DTI Ratio to see your front-end and back-end ratios, qualification status, and guidance.

DTI ratios, in short

Lenders look at two ratios, not one: front-end DTI (housing costs ÷ gross income) and back-end DTI (all debts ÷ gross income). On the calculator's defaults — $6,000 gross monthly income, $1,550 in housing costs, $700 in other debts — front-end comes to 25.83% and back-end to 37.5%. The front-end number comfortably clears the usual 28% conventional guideline; the back-end number is above the ideal 36% but still under the 43% hard ceiling most lenders use.

Key takeaways

  • Default example: $6,000 gross income, $1,550 housing, $700 other debts → front-end DTI 25.83%, back-end DTI 37.5%.
  • Front-end passes the conventional 28% guideline with room to spare; back-end at 37.5% exceeds the ideal 36% conventional target but stays under the 43% qualified-mortgage ceiling FHA and most conventional lenders enforce.
  • At this income, the math allows up to $1,680/month in housing at 28% DTI, $1,860 at 31% (FHA-style), or $2,160 at 36% — the current $1,550 payment fits inside all three.
  • There's about $330/month of additional debt capacity remaining before hitting the 43% qualified-mortgage limit.

Front-end vs. back-end: two different questions

Front-end DTI asks a narrow question: can you afford the housing payment alone, relative to income? Back-end DTI asks the fuller question: can you afford housing plus every other recurring debt obligation — car payments, student loans, credit card minimums, and the rest? A household can pass one comfortably and sit right at the edge of the other, which is exactly the default example here: 25.83% front-end (comfortable) against 37.5% back-end (borderline).

How this calculator scores the default example

Using the defaults — $6,000 gross monthly income, $1,200 mortgage P&I, $250 property tax, $100 home insurance, plus $350 car payment, $200 student loans, and $150 credit card minimums:

Housing total = $1,200 + $250 + $100 = $1,550

Front-end DTI = $1,550 ÷ $6,000 = 25.83%

Total debt = $1,550 + $350 + $200 + $150 = $2,250

Back-end DTI = $2,250 ÷ $6,000 = 37.5%

Reading the loan program comparison

Different loan programs draw the line in different places. Conventional loans typically want front-end at or below 28% and back-end at or below 36% — on this example, the 37.5% back-end just misses that bar. FHA loans are more permissive, allowing front-end up to 31% and back-end up to 43%, comfortably covering this borrower. VA loans skip a strict front-end limit entirely and use a more flexible back-end guideline around 41%. The same household can look tight under one program and well-qualified under another, which is why it's worth checking more than a single ratio against a single number.

How much room you actually have

At $6,000 in gross monthly income, the guideline percentages translate to concrete dollar ceilings:

Max housing at 28%: $1,680/month

Max housing at 31%: $1,860/month

Max housing at 36%: $2,160/month

Max total debt at 43% (QM limit): $2,580/month

With $2,250 already committed, that leaves about $330 a month of room before hitting the 43% ceiling — useful to know before taking on a new car payment or co-signing a loan, since it shows exactly how much new monthly debt the numbers can still absorb.

Related calculators

To see what home price these ratios translate to, see the house affordability calculator and mortgage calculator. For the spending side of the picture, the budget calculator checks your full monthly cash flow, not just the debt-related slice of it.

Frequently Asked Questions

What is a debt-to-income ratio?

Debt-to-income (DTI) compares your total monthly debt payments to your gross monthly income. On $6,000 in gross income with $2,250 in monthly debts (including housing), that is a 37.5% back-end DTI — lenders use this to gauge whether you can comfortably take on more debt.

What is the difference between front-end and back-end DTI?

Front-end DTI counts only housing costs against income; back-end DTI counts all debts, housing included. On $6,000 income with $1,550 in housing and $700 in other debts, front-end comes to 25.83% while back-end comes to 37.5% — the same household can look fine on one measure and borderline on the other.

What DTI ratio do lenders typically want?

Many conventional lenders prefer front-end DTI at or below 28% and back-end at or below 36%. FHA loans typically allow front-end up to 31% and back-end up to 43%, and VA loans skip a strict front-end limit in favor of a flexible back-end guideline around 41%.

Which debts count toward DTI?

Lenders usually include mortgage or rent, car loans, student loans, credit card minimums, and other recurring obligations. Utilities, groceries, and insurance premiums are generally excluded because they are living expenses, not debt payments.

How can I lower my DTI before applying for a loan?

Pay down revolving balances, avoid new debt, and consider increasing income through a raise, side work, or a co-borrower. Even paying off a small installment loan can remove an entire monthly payment from the ratio.

How do I use this debt-to-income calculator?

Enter your gross monthly income and each monthly debt payment, including housing. The calculator shows your DTI percentage and whether it falls within common lending guidelines.

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