Debt-to-Income (DTI) Ratio Calculator
Calculate both your front-end (housing-only) and back-end (all-debt) debt-to-income ratios, the numbers lenders compute from your income and monthly debts.
The back-end figure is the CFPB's definition of debt-to-income ratio: every monthly debt payment divided by gross monthly income. The front-end figure isolates housing costs alone — lenders use both, since a low back-end ratio can still hide an oversized housing payment relative to income.
What Debt-to-Income (DTI) Ratio Calculator Does
Debt-to-income ratio is neither a credit score nor one universal legal cutoff. It is simply what fraction of your income is already spoken for before a new payment is added. The Consumer Financial Protection Bureau defines it plainly: all monthly debt payments divided by gross monthly income. That single ratio is what this tool calls the back-end figure.
Lenders rarely stop at one number, though, which is why this tool computes a second: the front-end (or housing) ratio, which isolates housing costs (mortgage or rent, property tax, homeowners insurance, HOA dues) against income on their own. Both matter because they can disagree sharply. Someone with no car payment and no student loans but a housing payment stretching to the edge of what they earn can show a deceptively low back-end ratio while carrying real housing-cost risk that the back-end number alone hides.
A figure still widely repeated is a flat "43% DTI limit" for a Qualified Mortgage. That was true under the original 2014 ability-to-repay rule, but the CFPB's current General QM definition replaced the fixed DTI ceiling with a loan-pricing (APR) test in 2021, so there is no longer one fixed percentage that applies across the board. This page states that plainly instead of repeating a rule that no longer describes current law.
How to Use Debt-to-Income (DTI) Ratio Calculator
- Enter your gross monthly income, before taxes
- Enter your housing costs, then every other monthly debt payment
- Read your front-end (housing-only) and back-end (all-debt) ratios side by side
Formula Used by Debt-to-Income (DTI) Ratio Calculator
Back-end (overall) DTI — the CFPB's own definition
DTI = (total monthly debt payments ÷ gross monthly income) × 100
Worked example
The CFPB's own published example: a $1,500 mortgage payment, a $100 auto loan payment, and $400 in other monthly debt, against $6,000 in gross monthly income.
- Total monthly debt = $1,500 + $100 + $400 = $2,000
- DTI = $2,000 ÷ $6,000 = 0.3333…
Result: 33%, the exact figure the CFPB's own consumer page states for this example.
Front-end (housing-only) DTI
Front-end DTI = (housing costs ÷ gross monthly income) × 100
Worked example
A $1,800 monthly housing payment (principal, interest, tax, insurance) on $7,000 gross monthly income, alongside $350 auto, $200 student loan, and $150 credit card minimum payments.
- Front-end: $1,800 ÷ $7,000 = 25.71%
- Back-end: ($1,800 + $350 + $200 + $150) ÷ $7,000 = $2,500 ÷ $7,000 = 35.71% (shown rounded to one decimal in the tool)
Result: Front-end 25.7% and back-end 35.7%, both inside the common conventional-loan rule of thumb.
Maximum total debt payment at common back-end DTI thresholds
Pure arithmetic on gross monthly income rather than a preapproval, and not every lender uses these exact thresholds. 36% is the commonly cited conventional-loan rule of thumb; 43% and 45% are ceilings some loan programs and lenders use with compensating factors.
| Gross monthly income | At 36% DTI | At 43% DTI | At 45% DTI |
|---|---|---|---|
| $3,000 | $1,080 | $1,290 | $1,350 |
| $5,000 | $1,800 | $2,150 | $2,250 |
| $7,000 | $2,520 | $3,010 | $3,150 |
| $10,000 | $3,600 | $4,300 | $4,500 |
How to Read Your Result
Why there is no single "good" number this page states as fact
Conventional, FHA, VA, and USDA loans each set their own DTI tolerances, and individual lenders layer their own overlays on top of any program minimum. A commonly repeated rule of thumb for conventional loans references roughly 28% front-end and 36% back-end, but treating that as a hard pass/fail line would misstate how underwriting actually works today: compensating factors (a large down payment, strong reserves, high credit score) routinely allow higher ratios in practice.
DTI vs. credit utilization
DTI measures payment obligations against income; it says nothing about how much of your available credit you are using. A high credit-card balance relative to its limit hurts your credit score even at a low DTI, and vice versa: the two measures answer different questions.
Use the table as a ceiling, not a target
The dollar figures above show what a given DTI threshold implies at your income, so you can see the debt-payment room a lender might allow before assuming it is comfortable. Being approved at 45% DTI and being able to save, absorb a job gap, or handle an emergency at 45% DTI are two different questions: the first is underwriting, the second is your own budget.
Limitations & Accuracy Notes
- Uses gross (pre-tax) income, matching lender convention; it does not estimate take-home pay after taxes and withholding.
- Does not know your credit score, assets, or reserves, all of which affect what DTI a specific lender will actually approve.
- Treats every entered figure as a fixed monthly obligation; it does not average irregular or seasonal debt payments for you.
Frequently Asked Questions
How is debt-to-income ratio calculated?
Add up all your monthly debt payments and divide by your gross (pre-tax) monthly income. The CFPB's own example: $1,500 mortgage + $100 auto loan + $400 other debt = $2,000 in monthly debt; on $6,000 gross monthly income, that is a 33% DTI.
What is the difference between front-end and back-end DTI?
Front-end (also called the housing ratio) counts only housing costs (mortgage or rent, property tax, insurance, and HOA dues) against income. Back-end counts every monthly debt payment, housing included, against income. Lenders check both, since a low back-end ratio can still hide a housing payment that is uncomfortably large on its own.
What is a good debt-to-income ratio?
There is no single legal cutoff. Conventional mortgage underwriting commonly references front-end/back-end guidelines in the neighborhood of 28%/36% as a rule of thumb, but actual limits vary by lender and loan program: government-backed FHA, VA, and USDA loans typically tolerate meaningfully higher back-end ratios than a conventional loan. The CFPB's current Qualified Mortgage rule uses a loan-pricing (APR) test rather than a single fixed DTI percentage for most loans, which replaced the older flat 43% limit in 2021.
What expenses are included in DTI?
Recurring debt obligations with a required minimum monthly payment: housing, auto loans, student loans, credit card minimums, personal loans, and similar debts. Everyday living expenses (groceries, utilities, subscriptions, insurance premiums other than homeowners/renters insurance) are not debt payments and are not included.
References & Further Reading
- Consumer Financial Protection Bureau — What is a debt-to-income ratio? — Source for the DTI formula and the exact $2,000/$6,000/33% worked example used above.
- Consumer Financial Protection Bureau — What is a Qualified Mortgage? — Confirms the current General QM rule uses an APR-based pricing limit rather than a fixed DTI percentage.