Debt-to-Income Ratio Calculator

Your DTI ratio tells lenders — and you — how much of your pre-tax income is already committed to debt repayment each month. A lower ratio signals that you have adequate income relative to your obligations, making you a lower-risk borrower. Lenders typically distinguish between two versions: the front-end ratio, which covers only housing costs (mortgage or rent), and the back-end ratio, which includes all recurring debt payments. When people refer to DTI in a lending context, they usually mean the back-end ratio.

The formula is straightforward: divide total monthly debt payments by gross monthly income, then multiply by 100 to express the result as a percentage. Monthly debt payments include all minimum required payments on mortgages, rent, car loans, student loans, credit card balances, personal loans, child support, and alimony. Gross monthly income is your pre-tax earnings from employment, self-employment, rental income, investment income, and any other consistent source. It is critical not to use net (after-tax) income, as lenders universally calculate DTI using gross figures.

The Consumer Financial Protection Bureau (CFPB) and Fannie Mae guidelines indicate that a back-end DTI of 43% is typically the maximum allowed for a qualified mortgage, though many conventional lenders prefer 36% or lower. A front-end ratio of 28% or less is generally considered healthy for housing costs. FHA loans may permit back-end DTIs up to 50% with compensating factors such as strong credit scores or significant cash reserves. Understanding your DTI before applying for a mortgage or major loan can save considerable time and help you make targeted improvements — such as paying down specific debts — to improve your borrowing position.

The DTI calculator uses gross (pre-tax) income, which overstates actual take-home pay. Depending on your effective tax rate, your actual spendable income after taxes and debt could be significantly lower than the remaining income figure shown — particularly for high earners. Additionally, DTI does not account for living expenses such as groceries, utilities, insurance, childcare, or transportation costs beyond loan payments, meaning a technically acceptable DTI can still leave a borrower cash-poor. The calculator also does not factor in credit score, loan-to-value ratio, cash reserves, or employment history — all of which influence real-world loan approval decisions. Self-employed individuals with variable income should use an average of 24 months of documented earnings rather than a single month's figure. Finally, DTI benchmarks vary by loan type: FHA, VA, USDA, and jumbo loans each have different thresholds, and lenders may apply overlays that are stricter than published guidelines.