Debt-to-Income Ratio Calculator
Loans & MortgagesThe ratio lenders judge you by.
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 10% 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. | 10% |
| Target front-end DTI | The housing-only ratio you're aiming to stay under. | 10% |
Know what this estimate is based on
- Jurisdiction
- General model; U.S.-specific rules are identified on the relevant tool
- Scope and limitations
- Educational estimate only. A lender may use different compounding, day-count, eligibility, tax, insurance, escrow, fee, or rounding rules.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter your gross monthly income — your pay before tax and deductions.
- 02
Build your housing payment from its parts: mortgage principal & interest, then property tax, homeowners insurance, HOA fees and any PMI (or just your rent).
- 03
Itemize every other required debt — credit-card minimums, auto, student and personal loans, and anything else recurring.
- 04
Read your front-end and back-end ratios and risk band, then open Advanced to set your target DTI, size the mortgage you'd qualify for, and stress-test a new loan.
Formula
Debt-to-income (DTI) compares your monthly debt payments with your gross monthly income, and this tool reports both ratios lenders use. The front-end ratio looks at housing alone — principal, interest, tax, insurance, HOA and PMI: front-end = total housing ÷ gross income × 100. The back-end ratio, the headline number, adds every other required payment: back-end = (housing + other debt) ÷ gross income × 100. From a target ratio the calculator works backwards: the most total debt you can carry is income × target, your remaining capacity is that figure minus today's debt, and the income that would put today's debt exactly at the target is total debt ÷ target. The maximum housing payment a front-end target allows is income × front-end target, and backing a loan out of that budget at a representative rate and term estimates the mortgage you'd qualify for under each lending standard. Income is gross (pre-tax) and only required debt service counts — never groceries, utilities or other living costs.
Example
Suppose your gross income is 80,000 a month. Your housing payment is built from 14,000 of mortgage principal & interest plus 1,500 property tax, 1,000 insurance, 1,500 HOA and 2,000 PMI — 20,000 in all. Your other debts are 2,000 of card minimums, a 4,000 car payment and a 2,000 student loan, totalling 8,000, so total monthly debt is 28,000. Front-end DTI is 20,000 ÷ 80,000 = 25%; back-end DTI is 28,000 ÷ 80,000 = 35% — a low-risk band, just inside the 36% comfort line. At a 36% target your income supports up to 28,800 of total debt, leaving 800 a month of remaining capacity. A 28% front-end target allows up to 22,400 of housing, so you have 2,400 of housing headroom. Held against the lending standards, you clear Conventional (28% / 36%) and FHA (31% / 43%), which — at 6.5% over 30 years and keeping your taxes and insurance — corresponds to an estimated mortgage of roughly 2.34M to 2.97M. Now stress-test a new 10,000 loan: total debt rises to 38,000 and your back-end ratio jumps to 47.5%, well past target and into the high-risk band — a clear signal to wait or borrow less.
Definitions
- Gross monthly income
- Your total monthly income before tax and deductions — wages and any steady additional income a lender will count. The denominator of both ratios (0 to 2,000,000).
- Housing payment (PITI)
- The full cost of your home each month — mortgage principal & interest plus property tax, insurance, HOA fees and PMI — and the basis of the front-end ratio.
- PMI / mortgage insurance
- Private mortgage insurance, charged while your equity is under about 20%; it is part of your housing payment and counts toward both ratios.
- Other debt payments
- Every other required monthly payment — credit-card minimums, auto, student and personal loans, and any other recurring debt service.
- Front-end ratio
- Housing payment as a percentage of gross income; lenders often like this at or below 28% (Conventional) or 31% (FHA).
- Back-end ratio
- All debt payments as a percentage of gross income — the main DTI figure, with 36% and 43% as the key thresholds.
- Target DTI
- The back-end ratio you choose to aim under (36% by default). The calculator measures your capacity, debt to cut, and income needed against it.
- Maximum allowed debt
- The most total monthly debt your income supports at the target: income × target ratio. Subtract today's debt to get your remaining capacity.
- Remaining debt capacity
- How much more monthly debt you could take on before crossing your target — maximum allowed debt minus current total debt.
- Mortgage qualification range
- An estimate of the loan a lender would support, backed out of the maximum housing payment each standard allows at a representative rate and term.
- Lending standards
- Customary ceilings — Conventional (28% / 36%), FHA (31% / 43%) and a stretch tier (37% / 50%) — your ratios are checked against.
- Stress test
- Adds a prospective new monthly payment to your debt to show how a future loan would move your back-end ratio and risk band.
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's the difference between the front-end and back-end ratio?
The front-end (or housing) ratio measures your full housing payment — principal, interest, tax, insurance, HOA and PMI — against gross income. The back-end ratio adds every other required debt: cards, auto, student and personal loans. Lenders look at both; this tool reports each so you can see whether it is housing or your other debts that are stretching your budget, because the fix differs depending on which is the problem.
Does DTI use gross or take-home income?
Gross income — your pay before tax and deductions. Lenders standardize on gross because tax situations vary. That means your real, after-tax burden feels heavier than the ratio implies, so it is wise to leave a comfortable margin below any lender limit rather than borrowing right up to it.
What counts as debt in the ratio?
Required monthly debt payments: your full housing payment, car and student loans, personal loans, and the minimum payments on credit cards. Everyday spending such as groceries, utilities, insurance premiums and subscriptions is not counted, because it is living expense rather than debt service.
Why does 43% matter?
43% is a widely used ceiling: many mortgage programs treat it as the upper limit for a 'qualified mortgage', and lenders watch it closely. Below 36% is comfortable, 36–43% is workable but tightening, and above 43% sharply narrows your options — though strong credit or a large down payment can sometimes compensate.
How is the mortgage qualification range estimated?
The tool takes the maximum housing payment each standard allows (the smaller of its front-end limit and the back-end room left after your other debts), subtracts your current taxes, insurance, HOA and PMI to find the principal-and-interest budget, then backs a loan out of it at a representative 6.5% over 30 years. It is a planning guide, not a pre-approval — your actual rate, term, reserves and credit will move the number.
What does the stress test do?
It adds a prospective new monthly payment — say a car loan or a second mortgage you're considering — on top of your existing debt and recomputes your back-end ratio and risk band. It answers the practical question 'can I take this on?' before you sign, and warns you when the new payment would push you past your target.
How can I lower my DTI quickly?
You have two levers: reduce the monthly debt numerator or raise the income denominator. Paying off a small loan entirely removes its whole payment from the ratio, which often helps more than chipping away at a large balance. Avoid taking on new monthly payments in the months before you apply, and count any reliable additional income.
Does my DTI affect my credit score?
Not directly — credit scores do not see your income, so DTI is not a scoring factor. Credit-card utilization (balances versus limits) does affect your score and is a separate measure. Lenders look at both: the score for how you handle credit, and DTI for whether your income can support a new payment.