What the debt-to-income ratio measures
Your debt-to-income ratio (DTI) compares your monthly debt payments to your gross monthly income. Lenders use it to judge how much of your pay is already committed to debt before they extend new credit.
The ratio is simple: add up minimum payments on credit cards, auto loans, student loans, and personal loans, plus your housing payment, then divide by gross monthly income. This calculator does the division and shows the result as a percentage.
A lower ratio signals more room in the budget for a new loan. A higher ratio means debt is consuming a large share of income and new borrowing gets riskier for both lender and borrower.
The 43 percent mortgage benchmark
The Consumer Financial Protection Bureau points to 43% as the conventional ceiling for a qualified mortgage. That figure appears in the qualified mortgage rule, which limits how much of a borrower's income can go to debt.
The calculator shows the maximum monthly debt payment that keeps you at exactly 43%. If your current DTI sits below that line, a mortgage payment could fit. Above it, most lenders will want the ratio lower.
Note that many lenders prefer lower ratios, around 36%, with a cap near 28% on housing alone. Treat 43% as an upper bound, not a target.
What DTI does not capture
DTI looks at payments, not balances. Two households can have identical ratios while one holds a few thousand dollars of debt and the other holds a hundred and fifty thousand.
It also ignores savings, credit score, and payment history. A borrower with a modest ratio but weak credit may still face high rates, while a strong borrower slightly over 43% may qualify through other lending channels.
For FIRE planning, keep the ratio comfortably under 36% so your budget has room to fund investing alongside debt payments.
Frequently Asked Questions
How is debt-to-income ratio calculator calculated?
The formula is: DTI = monthly debt payments / gross monthly income. Enter your values above and click Calculate to see your personalized result instantly. Your debt-to-income ratio divides your monthly debt payments by your gross monthly income. With $1,500 of monthly debt payments and $5,000 of gross income, the ratio is 30 percent. The calculator…
What inputs do I need for the debt-to-income ratio calculator?
You need: Monthly Debt, Monthly Income. Default values are pre-filled — adjust them to match your personal finances for a customized result.
Is the debt-to-income ratio calculator free to use?
Yes — all TorchFI calculators are completely free. No registration, no email required. Calculations run entirely in your browser for maximum privacy. We never see or store your financial data.
How does the debt-to-income ratio calculator help with FIRE planning?
Calculate your debt-to-income ratio and see how much monthly debt you can carry while staying under the 43 percent mortgage limit used by most lenders. This calculator helps you make data-driven decisions about your financial independence journey instead of relying on guesswork.