Answer: Enter your values and the Debt-to-Income Ratio Calculator returns the exact result instantly — formula, worked example, and a plain-English explanation are included below the tool.
Calculate your DTI ratio
Enter your gross monthly income and your monthly debt payments, and the calculator returns your debt-to-income ratio — the share of pre-tax income already committed to debt. The front-end ratio counts only housing costs (mortgage principal and interest, property taxes, insurance, and association dues — what lenders call PITIA); the back-end ratio counts every recurring debt payment: the housing total plus car loans, student loans, minimum credit card payments, and other installment obligations. Everything computes instantly in your browser.
Lenders use gross income, not take-home pay, and they use minimum required payments rather than what you actually pay above the minimum — two details that surprise first-time applicants. Income documented for a mortgage generally means the stable, verifiable two-year history of wages or self-employment income that underwriting guidelines allow.
| Gross monthly income | Total monthly debt | Front-end (housing only) | Back-end (all debt) | Typical reading |
|---|---|---|---|---|
| $6,000 | $2,100 (incl. $1,500 housing) | 25% | 35% | Approaching conventional limit |
| $6,000 | $2,400 (incl. $1,500 housing) | 25% | 40% | Above most conventional caps |
| $8,000 | $2,000 (incl. $1,600 housing) | 20% | 25% | Comfortable |
| $8,000 | $3,200 (incl. $2,400 housing) | 30% | 40% | FHA-range, tight conventional |
| $4,500 | $1,350 (incl. $900 housing) | 20% | 30% | At conventional cap |
| $4,500 | $1,800 (incl. $1,200 housing) | 26.7% | 40% | Needs strong compensating factors |
Read the ratios against the thresholds below: the same 40% back-end figure is workable under some loan programs and disqualifying under others, and compensating factors — large down payment, substantial reserves, excellent credit — can push an approval past the usual caps.
The commonly cited guideline for conventional conforming loans, as Fannie Mae's selling guidance sets out, allows back-end DTI up to about 45%, with case-by-case approval to 50% when strong compensating factors exist. FHA loans are more permissive, generally permitting ratios in the neighborhood of 43% to qualify at the algorithmic level and higher with manual underwriting. VA loans take an approach that is different in kind: they compute a residual-income test — money left after expenses — alongside a 41% ratio guideline. USDA loans typically cap at 41%.
Front-end housing ratios, once a hard constraint, are now secondary: underwriting for most programs is driven by the back-end number and overall credit profile. A front-end around 28% remains a reasonable personal budgeting guideline even though few programs enforce it.
For planning, remember DTI cuts both ways: paying off a car loan before applying removes that payment entirely from the calculation, while a new car loan taken just before closing can break an approved loan, because lenders re-check debt shortly before funding.
The levers are income and obligations. On the obligation side: pay down or pay off small installment loans (a loan with under about ten months of payments remaining is often excluded anyway), avoid new credit, and consolidate or pay down cards whose minimums inflate the ratio. On the income side, document everything allowable — consistent overtime, bonuses, and side income with a two-year history can count under many guidelines, while new income streams without history generally cannot.
Also worth knowing: DTI is blind to expenses that are not debt — groceries, utilities, childcare, insurance outside PITIA — so a low ratio is necessary but not sufficient; you still need the full budget to work at the payment level.
Walk one application end to end. A buyer earning $7,000 gross monthly with a $450 car payment, $300 student loan, and $150 in card minimums carries $900 of non-housing debt — a 12.9% back-end DTI before any mortgage. At a 45% conventional cap, the maximum PITIA the numbers allow is about $2,250 monthly (32.1% front-end). The same buyer paying off the car first drops to $450 of debt, raising the maximum housing payment to about $2,700 — a materially larger price range for the cost of one payoff.
Refinancing contexts use the same math: a refinance application includes the new proposed payment in place of the old one, and the DTI must qualify with the new number even if the payment is dropping. Student loans in deferral are generally counted at a percentage of the balance or the documented payment under program-specific rules, not ignored — a detail that catches many applicants by surprise.
One habit worth forming before any application: run your own DTI every quarter with this calculator, so the number is never a surprise during underwriting and you can time payoffs and new purchases around it deliberately.
What is a good DTI ratio? Most lenders like a back-end ratio at or below 36%, with conventional loans commonly capping near 45% and FHA permitting more. Lower is always stronger.
Does rent count in DTI? Current rent usually does not count for a mortgage application, because that payment will be replaced by the housing payment being qualified; the future PITIA does count.
Do credit cards count at the minimum or full balance? Minimum required payments count. Paying cards down before application lowers minimums and the ratio.
Can I get a mortgage above the normal limits? Yes, with compensating factors — larger down payment, strong reserves, high credit scores — or via manual underwriting; expect more scrutiny, not less.
Is DTI based on gross or net income? Gross monthly income, as documented through pay stubs, W-2s, or tax returns for the self-employed.