Student Loan Calculator
Calculate monthly student loan payments, total interest, and payoff timeline with amortization schedule.
About Student Loan Calculator
A student loan calculator estimates monthly payments, total interest, and payoff timeline for student loans based on the loan amount, interest rate, and repayment term. Student loans are among the largest sources of debt for young adults, with the average US borrower owing over $37,000. Understanding your repayment options and the long-term cost of borrowing helps you make informed decisions about loan amounts, repayment plans, and strategies for paying off debt faster.
How to Use
Enter the total loan amount, annual interest rate, and repayment term (in years). The calculator shows your monthly payment, total amount paid over the life of the loan, total interest paid, and an amortization schedule showing how each payment is split between principal and interest over time. You can also compare different repayment scenarios side by side.
Formula / Key Equations
Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1], where P = principal, r = monthly interest rate (annual rate / 12), n = total number of payments. Total Paid = Monthly Payment × n. Total Interest = Total Paid - Principal. Standard repayment term is 10 years; extended plans go up to 25 years.
Common Use Cases
Comparing federal vs private loan options before borrowing. Planning monthly budgets with student loan payments. Evaluating income-driven repayment plans. Deciding whether refinancing makes sense. Calculating savings from making extra payments. Understanding the total cost of different repayment timelines (10-year vs 20-year vs 25-year plans).
Limitations
The calculator assumes a fixed interest rate — variable rate loans will have changing monthly payments. It does not account for income-driven repayment plans (IBR, PAYE, REPAYE), loan forgiveness programs (PSLF), grace periods, or fees (origination fees are typically 1-5% on federal loans). Tax implications of student loan interest deductions are not included.
Frequently Asked Questions
How much student loan debt is too much?
A common guideline is that total student loan payments should not exceed 10-15% of your projected monthly gross income. For example, if you expect to earn $50,000/year ($4,167/month), your monthly loan payment should ideally be under $417-625. Use our calculator to estimate payments before borrowing.
Should I pay off student loans early or invest?
It depends on your interest rate. If your loan rate is below 4-5%, you may earn more by investing the extra money in the stock market (historical average returns of 7-10%). If your rate is above 6%, paying off loans early likely provides a guaranteed return that exceeds conservative investment returns.
What is an amortization schedule?
An amortization schedule shows how each monthly payment is divided between interest and principal. In the early years, most of your payment goes toward interest. Over time, more goes toward principal. This is why making extra payments early in the loan term can significantly reduce total interest paid.
Can I refinance my student loans?
Yes, if you have good credit and stable income. Refinancing can lower your interest rate, reduce monthly payments, or shorten the repayment term. However, refinancing federal loans with a private lender means losing federal benefits like income-driven repayment and loan forgiveness options.
How does income-driven repayment work?
Income-driven plans (IBR, PAYE, REPAYE, ICR) cap your monthly payment at a percentage of your discretionary income (typically 10-20%). After 20-25 years of payments, any remaining balance is forgiven (but the forgiven amount may be taxable). Our calculator uses standard amortization, not income-driven formulas.
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