Your student loan lender’s website will usually offer the best loan repayment calculators corresponding to their repayment plans.

These websites offer generic calculators on repayment, calculating interest and general loan management:

FinAid.org http://www.finaid.org/calculators/

Mapping Your Future http://mappingyourfuture.org/paying/standardcalculator.htm

BankRate.com (loans) http://www.bankrate.com/brm/popcalc2.asp

BankRate.com (credit cards) http://www.bankrate.com/brm/calc/creditcardpay.asp