Debt-to-Income Ratio Calculator
Work out your DTI ratio the way a lender does, see which band you fall into, and find how much debt you would need to clear to reach the next one.
How to use this calculator
- 1Enter gross monthly income before any deductions.
- 2List the minimum required payment on each debt — not what you usually pay.
- 3Leave out utilities, groceries, phone and subscriptions. They are not debts.
- 4Compare your back-end figure against the threshold table to see what a lender would say.
How the calculation works
Back-end DTI = Total monthly debt / Gross monthly income × 100
Front-end DTI = Housing payment / Gross monthly income × 100- Total monthly debt
- Housing plus every other required debt payment
- Gross monthly income
- Income before tax and deductions
Only *debt* counts. Utilities, groceries, insurance, phone bills and subscriptions are excluded — lenders treat them as living costs, not obligations.
Credit cards count at their minimum payment, not the balance or what you usually pay.
Gross rather than net income is used, which is why the ratio always looks better than your bank balance feels.
Worked example
$7,500 income with $2,500 of monthly debt
- 1.Total debt: 1,800 + 350 + 220 + 130 = $2,500.
- 2.Back-end DTI = 2,500 ÷ 7,500 = 33.3%.
- 3.Front-end DTI = 1,800 ÷ 7,500 = 24.0%.
- 4.Both sit inside the conventional 28/36 limits, so this profile qualifies comfortably.
Result: 33.3% back-end, 24.0% front-end — comfortable
What debt-to-income ratio actually measures
Debt-to-income ratio compares how much of your income is already spoken for by debt payments against how much you earn before tax. It says nothing about your net worth, your savings, or how comfortable your lifestyle feels — it measures one narrow thing: how much room is left in your monthly income to take on a new payment without becoming overextended. That narrowness is exactly why lenders lean on it so heavily. It is a simple, hard-to-manipulate number that predicts repayment risk reasonably well across a huge range of borrowers.
Because it is calculated from monthly obligations rather than total debt owed, DTI treats a small loan with a large payment as more threatening than a large loan with a small one — which is a more accurate picture of monthly cash-flow risk than the balance alone would give.
Front-end versus back-end DTI
Lenders usually look at two versions of the same idea. Front-end DTI counts only the proposed housing payment against income — useful for judging whether a mortgage payment alone is affordable. Back-end DTI adds every other required debt payment on top of housing, giving the fuller picture of total monthly obligations. Mortgage underwriting typically weighs both, but back-end is the figure that most often decides whether a loan is approved.
What counts as debt, and what does not
DTI counts contractual debt obligations only — recurring payments you are legally committed to making. It deliberately excludes ordinary cost-of-living expenses, even large ones, because those can flex in a way debt payments cannot.
- Counted — mortgage or rent, auto loans, student loans, minimum credit card payments, personal loans, and court-ordered obligations like child support or alimony.
- Not counted — groceries, utilities, phone and internet bills, insurance premiums, subscriptions, and everyday discretionary spending — these matter to your budget, just not to this particular ratio.
Bringing your DTI down
Because DTI is driven by monthly payments rather than balances owed, the fastest improvements often come from eliminating a payment entirely rather than chipping away at a larger one.
- 1Pay off a small balance completely — clearing an entire loan removes its whole payment from the calculation, which usually moves the ratio more than paying extra toward a larger balance with more months left on it.
- 2Avoid new financing before a big application — a new car loan or store card taken out shortly before applying for a mortgage can push DTI over a lender’s threshold at the worst possible time.
- 3Increase documented income — a raise, a second job, or qualifying additional income sources widens the denominator, though this is typically the slowest lever to pull.
- 4Refinance existing debt — extending a loan term or consolidating several debts into one can lower the combined monthly payment, even though it may increase total interest paid over time.
What this assumes, and where it stops
Assumptions
- Income is stable and documentable. Lenders average variable and self-employed income over two years.
- The payments entered are the contractual minimums a lender would see on a credit report.
Limitations
- DTI is one of several underwriting factors. Credit score, employment history, reserves and the loan-to-value ratio all matter too.
- Different loan programmes use different limits, and some allow compensating factors to override the standard thresholds.
- A debt with fewer than about ten payments remaining is sometimes excluded by lenders. This calculator counts everything.
Common questions
What is a good debt-to-income ratio?
Under 36% is the conventional target and keeps every option open. Up to 43% still meets the Qualified Mortgage standard in the US. Above 50%, mainstream lenders will usually decline regardless of income or credit score.
Does rent count toward DTI?
Yes — your current housing payment is part of the ratio. When you apply for a mortgage, the lender substitutes the proposed new payment for your current rent, since you will not be paying both.
What is the fastest way to lower my DTI?
Eliminate a payment entirely rather than reducing several. DTI counts monthly payments, not balances, so clearing a small loan with a $300 payment helps far more than paying $5,000 off a mortgage. Increasing income works too, and is often slower.
Sources
- What is a debt-to-income ratio? — US Consumer Financial Protection Bureau
Formula and content last reviewed on .
Results are estimates for information only, not professional advice.
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