College Debt-to-Income Calculator

Last updated July 2, 2026

The debt-to-income ratio for college borrowing has become one of the most useful guardrails in the student loan conversation, precisely because it links borrowing to the economic reality that comes after graduation. The widely cited rule of thumb is to keep total student loan debt at graduation below your expected first-year salary in your chosen field. A nursing graduate starting at $65,000 should target under $65,000 in total loans. A social work graduate starting at $40,000 should target under $40,000. When debt exceeds starting salary, the monthly payment under standard 10-year repayment consumes a disproportionate share of take-home pay and limits financial options for years — delaying savings, homeownership, and retirement contributions.

The ratio becomes alarming quickly when the combination of high-cost school and lower-earning major collide. A student borrowing $120,000 for a psychology degree with average starting salaries around $36,000 has a debt-to-income ratio of 3.3 — nearly impossible to manage without income-driven repayment extending the loan for 20 or more years. FREOPP's analysis of 53,000 degree programs found that roughly a quarter of bachelor's programs produce a negative return on investment — graduates who would have been better off financially without the degree. The debt-to-income framework is a practical screen that catches the most financially damaging combinations before they're locked in.

Projected total debt at graduation compared with median starting salary in the target field is the core affordability test for any program. If debt exceeds starting salary, you're in financially difficult territory. If it exceeds twice your starting salary, reconsider the school, the major, or the borrowing amount. This ratio is one of the most reliable early indicators of post-graduation financial stress.