Add up all your monthly debt payments
Include mortgage or rent only if your lender requires it
Include car loans
Include student loans
Include credit card minimum payments
Include personal loans
Include any other recurring debt obligations
Add up your gross monthly income
Use income before taxes and deductions
Divide total monthly debt payments by gross monthly income
Multiply the result by 100 to get a percentage
Debt-to-income ratio = (Monthly debt payments ÷ Gross monthly income) × 100