Debt-to-Income Ratio Calculator
Calculate your debt-to-income ratio — the percentage of gross monthly income that goes to debt payments — the same way mortgage lenders compute it. Use it to gauge how lenders will view your application and whether your debt load is comfortable, stretched, or risky.
Last updated: May 2026
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About this calculator
The formula is: DTI = monthly debt payments ÷ gross monthly income × 100. The numerator is the sum of all recurring required debt obligations: mortgage or rent, minimum credit-card payments, auto loans, student loans, personal loans, child support, alimony. It does NOT include utilities, food, transportation costs (other than auto loan), subscriptions, or savings contributions — those affect your budget but are not "debt" in lender language. The denominator is gross (pre-tax) monthly income from all verifiable sources: salary, self-employment income averaged over 2 years, bonuses (typically only if documented over 2 years), rental income, investment income. Mortgage lenders distinguish two DTI variants: front-end DTI (housing payment only as a fraction of income, target ≤28%) and back-end DTI (all debt including housing, target ≤36%, max ~43% for federally-backed qualified mortgages). Most consumer-credit decisions use back-end DTI, which is what this formulation produces when monthly debt payments include housing. Edge cases: zero gross income produces division by zero; very low income relative to even minimal debt produces extreme DTI percentages that no lender will accept. The metric assumes regular monthly payments and does not capture variable obligations like balloon payments, irregular bonuses, or business cash flow.
How to use
Example 1 — Mortgage applicant. Gross monthly income $8,500. Monthly debt payments: projected mortgage PITI $2,200, credit cards minimum $180, auto loan $450, student loan $290 = $3,120 total. Enter 3120 for Monthly Debt Payments and 8500 for Gross Monthly Income. Result: 36.71%. Verify: 3120 / 8500 × 100 = 36.71%. ✓ A 36.71% DTI is within the standard 43% qualified-mortgage threshold and acceptable to most lenders, though under 36% would qualify for the best rates. Example 2 — Renter with consumer debt. Gross monthly income $4,800. Monthly debt payments: rent $1,500, credit card minimums $250 (multiple cards), car loan $375, no other debt = $2,125 total. Enter 2125 and 4800. Result: 44.27%. Verify: 2125 / 4800 × 100 = 44.27%. ✓ A 44% DTI is high — above the 43% qualified-mortgage ceiling and considered stretched by most lenders. Reducing this requires paying down credit cards (which also lowers minimum payments) or substantially increasing income.
Frequently asked questions
What DTI do lenders actually require?
For mortgages: the qualified-mortgage rule caps DTI at 43% for most federally backed loans; FHA loans can go higher (up to 50% in some cases); conventional loans usually prefer under 36% for the best rates. For auto loans: most lenders cap DTI around 50% including the new car payment; the best rates go to applicants under 40%. For personal loans and credit cards: lenders typically want DTI under 40–45% before approving new credit. The 28/36 rule is a traditional household-budgeting guideline: spend no more than 28% of gross income on housing (front-end DTI) and no more than 36% on all debt combined (back-end DTI). Going above these thresholds does not mean automatic denial, but the lender will charge higher rates or require a larger down payment to compensate for the higher perceived risk.
What is the difference between front-end and back-end DTI?
Front-end DTI (housing ratio) counts only your housing payment — mortgage PITI or rent — in the numerator. Back-end DTI counts all required debt payments including housing. Mortgage lenders care about both: a borrower with 28% front-end and 36% back-end (the classic 28/36 rule) is in great shape, while someone with 28% front-end but 48% back-end has manageable housing costs but heavy non-housing debt that elevates overall risk. This calculator computes back-end DTI when monthly debt payments include housing, which is the more inclusive and more commonly cited figure. For front-end DTI alone, plug in just your housing payment as the numerator.
How do I lower my DTI?
Three approaches in rough order of speed. First, pay down high-balance debts with outsized minimum payments — paying off a credit card with a $200 minimum removes $200 from the DTI numerator and improves the ratio more than paying off a card with a $50 minimum. Second, increase income through a raise, side income, or adding a co-borrower (with their income and debts) to the application. Third, refinance existing debt to longer terms with lower monthly payments — this lowers DTI on paper but does not actually reduce total debt cost, and in fact usually increases lifetime interest. Avoid taking on new debt during the months leading up to a major credit application; any new loan immediately raises DTI. Lenders also look at the trend, so showing a steady downward trajectory over several months is more persuasive than a snapshot.
What are the most common mistakes people make calculating DTI?
The most common is using net (after-tax) income instead of gross — DTI is always computed against gross income because that's the figure lenders work with. The second is forgetting non-obvious recurring debts: child support, alimony, structured medical-debt payment plans, and IRS installment agreements all count toward DTI. The third is using actual credit-card payments instead of minimums — DTI uses the minimum required payment shown on the statement, not what you choose to pay, so paying $1,000 toward a card with $50 minimum still adds only $50 to DTI. The fourth is including non-debt obligations like utilities, groceries, insurance premiums, daycare, gym memberships — these affect your budget but not DTI. Finally, people often understate variable income (bonuses, self-employment) because lenders only count amounts that can be documented as stable over a 2-year history.
When should I not rely on DTI alone?
DTI is a lender-centric metric that ignores life context — it tells you whether a bank will approve you, not whether the debt load is wise for you. A 30% DTI may be comfortable for a dual-income household with no kids and high savings; a 25% DTI may be ruinous for a single parent with childcare costs and no emergency fund. For household budgeting, also consider what percentage of gross income goes to savings (10–20% is healthy), taxes (10–30%), and required living expenses beyond debt (typically 30–40%). DTI also fails to capture credit utilization, which independently affects your credit score. For business loans, lenders use different metrics like DSCR (debt service coverage ratio). And do not use DTI for retirement planning or wealth-building decisions — it measures monthly cash burden, not long-term financial health.