The Debt-to-Income Calculator computes the ratio lenders check before almost any loan decision: your total monthly debt payments as a percentage of your gross monthly income. Enter a single debt total or itemize housing, car, credit cards, student loans, and other debts — itemized entries take over when provided — and it returns your back-end DTI, your housing-only front-end DTI, a health rating, the income left after debts, and a loan-by-loan eligibility read for conventional, FHA, VA, and USDA mortgages.
How It Works
Ratings follow the standard lending bands: 35% or under Excellent, 36–43% Good, 44–50% Fair, over 50% Poor. Eligibility is scored against each program's maximum DTI (conventional 43, FHA 50, VA 41, USDA 41): at or under 80% of a program's cap you rate Likely, up to the cap Borderline, beyond it Unlikely.
Worked Example 1: A Healthy Ratio
Gross income **1,200, car 200:
- Total debt $1,750 → back-end DTI 29.17% — rated Excellent
- Front-end DTI 20.00% (housing only) — inside the classic 28% front-end guideline
- Income remaining after debts: $4,250
- Eligibility: Likely across conventional, FHA, VA, and USDA — 29.17% sits under 80% of even the tightest cap (41% × 0.8 = 32.8%)
Worked Example 2: Where Programs Diverge
Gross income 2,300 → DTI 46.00%, rated Fair. Now the eligibility panel splits: conventional (cap 43) Unlikely; VA and USDA (cap 41) Unlikely; FHA (cap 50) Borderline — approvable in principle, but only with compensating strengths like cash reserves or excellent credit, and likely at worse pricing. Same borrower, same debts: the program is the difference between a yes and a no. Cutting $150 a month of debt payments brings this borrower to exactly 43% — the concrete value of paying off one small loan entirely before applying.
What Counts as Debt (and What Does Not)
Include obligations that appear as recurring payments: rent or mortgage (with taxes and insurance as your lender counts them), auto loans, student loans, personal loans, minimum credit-card payments, and court-ordered support. Exclude living costs — groceries, utilities, phone, insurance premiums, childcare — however real they feel, because DTI measures debt service, not cost of living. Two subtleties: lenders use the minimum card payment, not your balance or your usual payment; and deferred student loans still count, usually at an estimated 1% of the balance. Use gross income — the ratio is defined on pre-tax pay, which is why an "Excellent" DTI can still feel tight in a household budget run on net income.
Limitations
This is the ratio in isolation. Lenders combine DTI with credit history, employment stability, reserves, and the specific loan's features; program caps are guidelines with documented exceptions in both directions (some conventional loans run to 45–50% with strong files, some programs tighten below their headline cap). Figures are monthly and in one currency; if your income is seasonal or commission-based, lenders typically average two years of it, which changes the denominator materially. The eligibility read is an orientation, not an underwriting decision.
Frequently Asked Questions
Why does the itemized total override my single debt figure?
Because itemizing is the more precise input: when the five itemized fields sum to anything above zero, the calculator uses that sum as your total debt. If you prefer the single-figure estimate, leave the itemized fields at zero and enter the total directly — entering both would double-count nothing; the itemization simply wins.
What is the fastest way to lower my DTI?
Eliminate a payment entirely. DTI counts payments, not balances, so paying off a small loan outright removes its whole monthly payment from the numerator, while the same dollars spread across a large balance barely moves it. The other lever, raising documented income, works but is rarely as fast.
Is rent included, or only mortgage debt?
Rent counts — it is a housing obligation in the front-end ratio and a recurring payment in the back-end. Example 1's 20% front-end figure is rent. When you apply for a mortgage, your current rent drops out and the proposed mortgage payment (principal, interest, taxes, insurance, HOA) takes its place in both ratios.