Your debt-to-income ratio, or DTI, is one of the first numbers a lender looks at. It answers a simple question: how much of your gross monthly income is already committed to debt payments? A lower DTI means more room in your budget and better odds of approval. This debt-to-income ratio calculator works out both the housing (front-end) and total (back-end) ratios. It compares them with the guidelines used for conventional, FHA, VA and USDA mortgages and shows how much new monthly debt would still fit.
How to use the DTI calculator
- Enter your gross income, before taxes and deductions, monthly or yearly. Include a co-borrower’s income if you are applying together.
- Enter your rent or mortgage payment. For a mortgage, include property tax, homeowners insurance, HOA dues and any mortgage insurance.
- Enter the minimum payments on auto loans, student loans, credit cards and any other loans, plus child support or alimony you pay.
- Optionally enter a proposed new payment, such as a car loan or the mortgage you are applying for, to see your DTI afterward.
DTI formulas
Room under a limit is that limit × income − current debts. Lenders use the minimum payment shown on your credit report, not what you choose to pay.
Worked example
You earn $6,500 a month before taxes and pay $1,800 rent, $420 for a car, $250 toward student loans and $120 in card minimums.
- Total debts: $2,590 a month
- Back-end DTI: $2,590 ÷ $6,500 = 39.8%
- Front-end ratio: $1,800 ÷ $6,500 = 27.7%
- Room under 43%: $205 a month. Room under 36%: none.
Adding a $450 car payment would push DTI to 46.8%. That is above FHA’s 43% standard and VA’s 41% guideline, and in conventional territory only with automated approval.
Common DTI guidelines
| Loan program | Housing ratio | Total DTI |
|---|---|---|
| Conventional (Fannie Mae), manual underwriting | — | 36%, up to 45% with compensating factors |
| Conventional, Desktop Underwriter | — | Up to 50% |
| FHA | 31% | 43%, higher with compensating factors |
| VA | — | 41%, plus a residual-income test |
| USDA | 29% | 41% |
Credit cards, auto lenders and landlords use their own cutoffs, often 35% to 45% for total debt.
How to lower your DTI
- Pay off small balances. Eliminating a $120 card minimum lowers DTI more than paying the same amount toward a large loan with a $400 payment. The debt payoff calculator shows the fastest order.
- Avoid new debt before a mortgage application, especially car loans.
- Increase documented income. Steady side income usually counts once you have about two years of history.
- Choose a less expensive home. Check the price range your ratios support with the house affordability calculator, or the rent range with the rent affordability calculator.
- Change the loan structure. A longer term or a different program, such as FHA or VA, can lower the qualifying payment.
Estimates only. Each lender applies its own overlays and verifies income and debts from documents and your credit report.
Frequently asked questions
How do you calculate debt-to-income ratio?
Add up your required monthly debt payments, including rent or mortgage, auto loans, student loans, credit card minimums and support payments. Divide by your gross monthly income. $2,590 of payments on $6,500 of income is a 39.8% DTI.
What is a good debt-to-income ratio?
Below 36% is generally considered healthy, with no more than about 28% going to housing. Many mortgage programs accept higher ratios: FHA's standard guideline is 43%, VA uses 41% plus a residual-income test, and automated conventional approvals can reach 50% for strong applicants.
What is the difference between front-end and back-end DTI?
The front-end, or housing, ratio counts only your housing payment: principal, interest, property tax, insurance, HOA dues and mortgage insurance. The back-end ratio adds every other recurring debt. When people say DTI, they usually mean the back-end ratio.
What counts as debt for DTI?
Minimum required payments on debts that show on your credit report, plus housing costs and court-ordered obligations like child support or alimony. Everyday bills such as utilities, groceries, phone plans and car or health insurance are not counted. Lenders may also count a percentage of deferred student loan balances.
Is the 43% DTI rule still a federal requirement?
No. The CFPB's original Qualified Mortgage rule had a 43% DTI cap, but since 2021 the General QM definition uses a price-based test instead. 43% remains a common benchmark and is still FHA's standard guideline, but approvals above it are possible.