Debt-to-Income Ratio Calculator

Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward paying debts. Lenders rely on it heavily because it measures your capacity to take on and repay new borrowing — a lower DTI signals that you have room in your budget, while a high DTI suggests you may be stretched. Understanding and managing your DTI is one of the most useful things you can do before applying for a mortgage or major loan.

There are two versions. The front-end ratio (or housing ratio) is just your monthly housing cost — rent or mortgage payment including taxes and insurance — divided by gross monthly income. The back-end ratio is all your monthly debt payments combined — housing plus car loans, student loans, credit card minimums and other obligations — divided by gross income. Lenders focus most on the back-end ratio because it captures your total debt burden.

Lenders apply rough thresholds. For mortgages, a common guideline is the 28/36 rule: housing under 28% of gross income (front-end) and total debt under 36% (back-end), though many loan programs allow back-end ratios up to 43% or even higher with strong credit and reserves. A DTI below 36% is generally considered healthy; between 36% and 43% is manageable but watched closely; above 43% can make qualifying difficult and signals financial strain.

A crucial detail is that DTI uses gross income — your pay before taxes and deductions — not take-home pay. This means your real, after-tax budget is tighter than the ratio implies, so even a lender-acceptable DTI can feel stretched in practice. It also only counts debt payments, not everyday living costs like food, utilities and insurance, which is why a low DTI doesn't automatically mean a comfortable budget.

Improving your DTI comes down to two levers: reduce monthly debt payments (by paying down balances or refinancing to lower payments) or increase income. Because DTI is so central to lending decisions, lowering it before applying can mean qualifying for a larger loan, a better interest rate, or approval you'd otherwise miss. This calculator shows both ratios so you can see exactly where you stand.