Student Loan Interest Calculator

Last updated July 2, 2026

The total interest paid on a student loan over its life is frequently more than borrowers expect, because interest accrues daily on the outstanding principal balance — meaning that even a 10-year loan at a moderate rate adds up significantly on a large balance. A $50,000 loan at 7 percent on a standard 10-year repayment plan generates $19,372 in total interest, bringing the full repayment cost to $69,372. At 10 percent on a private loan, the same balance generates $31,726 in interest. Understanding these figures before signing is the single most important financial literacy step in the college borrowing process.

Unsubsidized loans add another layer of complexity: interest begins accruing from the moment of disbursement, including during the in-school period and the six-month grace period after graduation. A student who borrows $20,000 in unsubsidized loans as a freshman and doesn't make any interest payments during four years of school and a grace period will have roughly $26,000 in balance by the time repayment begins — $6,000 in capitalized interest added to the original principal. Making even small interest payments during school can prevent this capitalization and meaningfully reduce the long-term cost. Subsidized loans avoid this issue entirely — the federal government covers interest during school and grace periods — which is why exhausting subsidized loan eligibility before taking unsubsidized loans is consistently the better financial choice.

Look at the total interest paid over the life of the loan, not just the monthly payment. The monthly payment is manageable on almost any loan; the total interest reveals what borrowing actually costs. Paying even $50 to $100 per month toward unsubsidized loan interest during school can save thousands in capitalized interest by the time repayment officially begins.