Our student loan payment calculator can estimate both federal and private student loan payments. To calculate your student loan payments, enter the loan amount, anticipated interest rate, and term of the loan (how many years you have to pay it back). If you're using the student loan calculator for multiple loans, calculate each one separately and add up the payment estimates. Note: This is just an estimate and is not guaranteed. This calculator does not take into account your time spent in school, the loan’s grace period, the interest that accrues during that time, and whether or not the unpaid interest is capitalized (added to the principal) when the loan enters repayment.