Debt-to-Income Ratio Calculator
Your monthly money
Enter your gross monthly income to see your debt-to-income ratio.
Advanced — targets & stress test
Enter your gross monthly income to see your debt-to-income ratio.
Step-by-step calculation
- 1Add up your debts: housing $0 + other debt $0 = $0 total monthly debt.
- 2Front-end ratio: housing $0 ÷ income $0 = 0.0%.
- 3Back-end ratio: total debt $0 ÷ income $0 = 0.0%.
- 4At a 36% target, income $0 allows up to $0 of total monthly debt.
- 5Your debt $0 is under the $0 ceiling, leaving $0/mo of room before the target.
Formulas & your numbers
| Metric | Formula | Your value |
|---|---|---|
| Front-end DTI | Housing ÷ gross income × 100 | 0.0% |
| Back-end DTI | Total debt ÷ gross income × 100 | 0.0% |
| Max allowed debt | Income × target back-end % | $0 |
| Remaining debt capacity | max(0, Max allowed debt − total debt) | $0 |
| Income to reach target | Total debt ÷ target back-end % | $0 |
Your inputs
| Input | Meaning | Your value |
|---|---|---|
| Gross monthly income | Gross monthly pay, before tax — the ratio's denominator. | $0 |
| Housing payment | Mortgage P&I plus property tax, insurance, HOA and PMI. | $0 |
| Other debt | Cards, auto, student, personal and other required payments. | $0 |
| Target back-end DTI | The total-debt ratio you're aiming to stay under. | 36% |
| Target front-end DTI | The housing-only ratio you're aiming to stay under. | 28% |
Know what this estimate is based on
- Jurisdiction
- United States — Truth in Lending disclosure and the CARD Act set the floor; the terms that decide your balance are in your cardholder or loan agreement
- Rules and time period
- APRs, fees, promotional periods and minimum-payment formulas are the ones you enter; an issuer can change several of them with notice.
- Scope and limitations
- Educational estimate only. Your issuer sets the minimum-payment formula, how a payment is allocated across balances, when interest is charged and any fees or promotional terms — check your agreement for the figures that bind, and expect a payoff date to move if a payment is late.
- Source links checked
- Sep 19, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
Primary sources
How to use
- 01
Enter your gross monthly income — before tax, and including any income you can document.
- 02
Enter your housing payment: rent, or mortgage principal, interest, taxes and insurance together.
- 03
Enter every other monthly debt payment — cards' minimums, auto, student and personal loans.
- 04
Read the two ratios: front-end is housing alone against income, back-end is all debt against income. Lenders look at both.
- 05
Shopping for a loan? Open “Advanced — targets & stress test”, set the targets you want to stay under, and enter the payment you expect. The stress test then shows your ratio before and after it, and says whether the new payment crosses your target.
- 06
Read the mortgage qualification table to see the housing budget and estimated loan that conventional, FHA and stretch limits each allow on your income.
Formula
Front-end (housing) ratio = monthly housing payment / gross monthly income x 100, where housing means principal, interest, taxes, insurance and any HOA. Back-end ratio = (housing + every other monthly debt payment) / gross monthly income x 100. Both use gross income, before tax — every U.S. lender ratio does, which is why the number looks better than it feels against take-home pay. Only obligations that appear on your credit report count: card minimums, auto, student and personal loans, child support and alimony. Utilities, groceries, insurance and phone bills do not. Card balances contribute their minimum payment, not the balance. When you enter a payment you are applying for, the tool recomputes the qualifying ratio an underwriter would actually judge.
Example
Suppose your gross income is $7,000 a month. Your housing payment is $1,800, and your other monthly debts come to $650 — $250 of card minimums and a $400 car payment. Step 1 — Front-end ratio: $1,800 / $7,000 x 100 = 25.7% Step 2 — Add the rest: $1,800 + $650 = $2,450 of monthly debt Step 3 — Back-end ratio: $2,450 / $7,000 x 100 = 35.0% Result: 35.0% back-end and 25.7% front-end, both inside the classic 28/36 guidance and comfortable for most lenders. At a 36% target you have room for about $70 more of monthly debt before you cross it. Now stress-test it. Add a $900 car or personal loan payment and the back-end ratio becomes $3,350 / $7,000 = 47.9% — past the 43% line many mortgage programs stop at, even though nothing about your income changed. That is the number the underwriter reads, which is why it belongs in the decision before you sign.
Definitions
- Debt-to-income ratio (DTI)
- Monthly debt payments divided by gross monthly income. A lender's core affordability test.
- Front-end ratio
- Housing cost alone against gross income. Sometimes called the housing ratio.
- Back-end ratio
- All monthly debt payments, housing included, against gross income. The figure usually meant by 'DTI'.
- Gross monthly income
- Income before tax and deductions. The denominator of every U.S. lender ratio.
- PITI
- Principal, interest, taxes and insurance — the four parts of a mortgage payment counted in the front-end ratio.
- Qualifying ratio
- Your DTI including the loan you are applying for, which is what an underwriter actually assesses.
- Compensating factors
- Strengths that justify a higher ratio: cash reserves, a large down payment, a high credit score, or a long stable job history.
- Residual income
- What is left after all obligations. Central to VA underwriting, and a more direct affordability test than a ratio.
- Recurring obligation
- A monthly payment appearing on your credit report. Utilities and groceries are excluded even though you must pay them.
- Imputed payment
- A payment a lender assumes for a debt with none showing — most often a deferred student loan, counted at a percentage of the balance.
- Underwriting
- The lender's assessment of whether to lend, of which DTI is one input alongside the score, the down payment and the collateral.
- Co-borrower
- A second person on the loan whose income joins the calculation — and whose debts do too.
Good to know
The two ratios: front-end and back-end
Debt-to-income is really two related measurements, and this calculator reports both because lenders look at both to answer slightly different questions. The front-end ratio, sometimes called the housing ratio, compares only your housing payment against your gross monthly income; the back-end ratio, which is the headline DTI most people mean, compares all of your monthly debt payments, housing included, against the same income. The front-end ratio tells a lender how much of your income your home alone consumes, while the back-end ratio captures your entire debt burden across housing, cars, student loans and revolving credit. Both are expressed as percentages, and lower is better in each case, because a lower ratio means more of your income is uncommitted and available to absorb a new payment or weather a setback. Common guideposts put a comfortable front-end ratio at or below around twenty-eight percent and a comfortable back-end ratio at or below thirty-six percent, though the exact thresholds vary by loan program, and stronger applicants are sometimes allowed to stretch higher. Seeing the two numbers side by side is genuinely useful: a borrower with a high front-end but low back-end ratio is house-heavy but otherwise unencumbered, while one with a modest front-end but high back-end ratio is being squeezed by cars, cards or loans outside the home. The remedy differs depending on which ratio is the problem, so separating them points you toward the right fix rather than a vague sense that your debt is simply too high. The risk band shown on the result is keyed to the back-end ratio, because that is the figure that most often decides an application, but the front-end ratio sits right beside it so housing pressure never hides inside the larger number.
Building your housing payment: PITI, HOA and PMI
Your housing payment is more than the loan, and a DTI calculation that uses only the mortgage understates your front-end ratio, so this tool builds housing from its parts. The classic shorthand is PITI: principal and interest, the loan portion that pays the lender back; property tax, billed by the local authority and usually collected monthly into an escrow account; and insurance, the homeowners cover that protects the property. On top of PITI sit two common extras. Homeowners-association or condo fees, charged in many developments for shared upkeep, are a required recurring cost and belong in the housing figure. Private mortgage insurance, or PMI, is charged while your equity is below roughly twenty percent and protects the lender, not you, until you build enough equity to cancel it. Adding these together gives the true monthly cost of keeping the home, and it is that full figure, not the bare mortgage, that lenders count in the front-end ratio and in the housing portion of the back-end ratio. Itemizing them has a practical payoff beyond accuracy. It shows you how much of your housing cost is loan versus escrow, which matters because the escrow portion does not shrink as you pay down the balance the way principal and interest effectively do over time. It also makes clear how PMI inflates your ratio in the early years and why reaching the twenty-percent equity mark can quietly improve your borrowing position by removing it. If you rent rather than own, the same field simply takes your rent, which is your entire housing cost and the cleanest possible front-end input. Entering each component separately keeps the calculation honest and lets you see exactly which piece of your housing cost is doing the most to stretch your budget.
What counts as debt, and what does not
Getting your DTI right depends entirely on counting the correct things, because a single misclassification can move you into a different lender band. On the debt side, lenders include required monthly payments: your full housing payment, car loans, student loans, personal loans, and the minimum payments on credit cards and other revolving accounts. This calculator itemizes those other debts deliberately, so card minimums, an auto payment, a student loan and a personal loan each occupy their own line and nothing is quietly forgotten. What lenders generally do not include is everyday living expense: groceries, utilities, fuel, insurance premiums that are not part of the mortgage, phone and streaming subscriptions, childcare and similar costs. The logic is that DTI measures debt service, the obligations tied specifically to borrowing, rather than your overall spending or lifestyle. This can feel counterintuitive, because a household with high living costs but little debt can show a healthy DTI, while a household that spends carefully but carries several loans can show a stretched one, even though the second family may have more money left over each month. When you fill in the calculator, use the minimum payments on your cards rather than the full balances, because the minimum is what the lender counts as your monthly obligation. Counting living expenses as debt would overstate your ratio and might talk you out of a loan you could comfortably handle, while forgetting a loan would understate it and set you up for a surprise when a lender pulls your credit and counts it for you. A few items sit in a gray area, such as a loan with only a few payments left, which some lenders may exclude; when in doubt, count it, because a slightly conservative ratio leaves you a margin rather than an unwelcome shock.
Why lenders rely on DTI, and the thresholds that matter
When a lender decides whether to extend new credit, the central question is capacity: can this borrower comfortably take on another payment and still meet every existing obligation, even if something goes mildly wrong? Debt-to-income is the most direct answer, which is why it sits at the heart of underwriting alongside your credit history, and often carries more weight than the score itself for larger loans. A low DTI signals that a large share of your income is free, so a new payment slots in with room to spare; a high DTI signals that your income is already heavily committed, leaving little cushion if a repair, a medical bill or a dip in hours arrives. Particular thresholds carry real weight, and the calculator checks your ratios against the customary lending standards directly. Conventional loans traditionally look for a front-end ratio at or below twenty-eight percent and a back-end at or below thirty-six. Government-backed FHA loans are more generous, allowing roughly thirty-one percent front-end and forty-three percent back-end. A back-end ratio around forty-three percent is widely treated as the upper limit for a qualified mortgage, a line above which loans become harder to place, while some programs and compensating factors stretch toward fifty percent. The result groups your back-end ratio into a band on this scale: below thirty-six is comfortable, thirty-six to forty-three is workable but watched, forty-three to fifty is high, and above fifty is severe. None of these lines are absolute walls; strong credit, a large down payment, significant reserves or a history of handling similar payments can offset a higher ratio. But DTI remains the first filter most lenders apply, and clearing it comfortably is the surest way to keep your choices open and your terms favorable.
Gross income, not take-home pay
Debt-to-income is calculated against gross income, your pay before taxes and deductions, rather than the net amount that lands in your account, and this technical point has a very practical consequence. Lenders standardize on gross income because tax and deduction situations differ so widely from one person to the next that net pay would not be comparable across applicants; gross is the common denominator that lets them judge everyone on the same basis. But it means your real, after-tax burden is heavier than the ratio suggests, because the figure in the denominator is larger than the money you genuinely have available to spend. A thirty-six percent DTI measured on gross income can feel closer to the mid-forties as a share of take-home pay once taxes and deductions are accounted for, which is why a ratio a lender considers comfortable can still feel tight in daily life. The sensible response is to leave yourself a deliberate margin: rather than borrowing right up to a lender's limit, aim comfortably below it so your budget works on the money you actually receive, not just on paper. The target field in this calculator lets you do exactly that. Set it to thirty-six to see where lenders draw the comfort line, or set it lower to plan around your own, stricter ceiling, and the capacity figures will recompute against whatever target you choose. For salaried borrowers with steady pay the gross figure is straightforward, but for self-employed, commissioned or variable-income borrowers, lenders often average income over a year or two and may apply their own adjustments, so the income they count can differ from what you expect. It is worth understanding in advance how your particular income will be assessed, because planning around a higher figure than the lender will use leads to a ratio that does not hold up when the application is reviewed.
From ratio to capacity: maximum debt, income needed and the levers
A ratio on its own tells you where you stand; the more actionable question is what to do about it, and the calculator answers that by working the arithmetic backwards from your target. Because the back-end ratio is total debt divided by income, a target ratio fixes the most debt your income can carry: maximum allowed debt is simply income multiplied by the target. Subtract what you already owe each month and you get your remaining capacity, the room you have to take on more before crossing the line; when today's debt is already above the ceiling, that same subtraction becomes the amount you would need to cut to get back to the target. The tool also reports the income that would put your current debt exactly at the target, which is total debt divided by the target ratio, turning the goal into a concrete salary figure rather than an abstract percentage. On the housing side, the front-end target sets a maximum housing payment, income multiplied by the front-end target, and the gap between that and your current housing is your housing headroom. Seeing these levers laid out makes the two ways to improve a ratio concrete: shrink the debt on top or grow the income underneath. It also reveals which move is most efficient. Eliminating a small loan entirely removes its whole payment from the numerator, which often helps more than chipping away at a large balance whose required payment does not change. Avoiding new monthly obligations in the months before you apply protects the ratio at the moment it matters most. And because the figures recompute the instant you change an input, you can test a plan directly: clear the card, drop the auto payment, nudge income up, and watch your remaining capacity and risk band respond in real time.
DTI and the mortgage you qualify for
Debt-to-income does not just decide whether you are approved; working backward from it estimates how large a mortgage you can carry, which makes it one of the most useful numbers to understand before you shop. A lender effectively takes your gross income, multiplies it by the maximum ratio they allow, and subtracts your existing debt to find the room left for a housing payment; that payment, given a rate and term, sets the loan size on offer. This calculator runs that chain for each lending standard. For Conventional and FHA limits it finds the housing payment you would be allowed, which is the smaller of the front-end cap and the back-end room left after your other debts, removes your current taxes, insurance, HOA and PMI to isolate the principal-and-interest budget, and backs a loan out of that budget at a representative rate and term to produce an estimated mortgage range. The result is deliberately framed as a guide rather than a pre-approval, because your real rate, term, reserves and credit will move it, but it makes the relationship between debt and buying power vivid. It explains why paying down other debts can increase the home you can afford even when your income has not changed: every dollar of other-debt payment you remove frees a dollar of capacity that can be redirected to housing, often translating into a meaningfully larger loan. It also explains why two people with identical incomes can qualify for very different amounts, since the one carrying car loans and card balances has less room left for a mortgage than the one who is otherwise debt-free. If the range is smaller than you hoped, treat your ratio as a lever rather than a verdict: lowering it before you borrow can raise both the amount you qualify for and the quality of the terms you are offered.
Stress-testing a new loan, and the limits of a single number
Before you take on a new obligation, the honest question is not whether you can make the first payment but whether the payment fits alongside everything else, and the stress test answers exactly that. Enter a prospective monthly payment, for a car you are considering or a second loan, and the calculator adds it to your existing debt and recomputes your back-end ratio and risk band, warning you when the new payment would push you past your target. It is the difference between discovering a problem on paper and discovering it after you have signed. Useful as DTI is, it remains a blunt instrument that misses some important nuances, and the better lenders look beyond it. It ignores the absolute level of income, so a given ratio leaves a high earner with far more cash left over than the same ratio leaves someone on a modest income; this is why some lenders also weigh residual income, the actual money remaining after debts and essentials. It says nothing about your savings, your job stability or your down payment, all of which materially affect real risk and are the compensating factors that can justify a slightly high ratio or scrutinize a fragile borrower whose ratio looks fine. It is also distinct from your credit score, which never sees your income, and from credit utilization, which compares your card balances to their limits; a strong application attends to all three, because a lender weak-spotting any one can still decline or reprice a loan that looks fine on the others. And it is a snapshot of today, blind to a raise next year or a loan about to be paid off next month. None of this diminishes its value as a clear, standardized starting point, but treat your ratio as an honest first read on your capacity, then layer on the context a single number can never capture: your reserves, your stability and how much breathing room you actually want to keep.
Frequently asked questions
What is a good debt-to-income ratio?
Under 36% is comfortable, and it is where most lenders are relaxed. Conventional mortgages commonly allow up to 45%, and some programs stretch to 50% with strong compensating factors such as reserves or a large down payment.
What is the difference between front-end and back-end?
Front-end counts housing only against income; back-end counts every monthly debt payment. Mortgage lenders often quote both, as in '28/36' — 28% front-end and 36% back-end.
Is it gross or net income?
Gross — before tax and deductions. Every lender ratio in the U.S. uses gross monthly income, which is why the number looks better than it feels against your take-home pay.
Which debts count?
Anything appearing on your credit report as a recurring obligation: card minimums, auto, student and personal loans, child support and alimony. Utilities, groceries, insurance and phone bills do not.
Does a card balance count, or only the minimum?
Only the minimum payment. Someone carrying $20,000 across cards with $500 of minimums adds $500, not $20,000 — though the balance still hurts through utilization on the score itself.
How do I lower my ratio quickly?
Two levers. Pay off a small loan entirely — removing a whole payment moves the ratio more than shrinking several — or document more income, such as verifiable bonus, overtime or self-employment earnings a lender will accept.