http://www.interest.com/calculators

http://www.moneychimp.com/calculator/compound_interest_calculator.htm

http://mortgages.interest.com/content/calculators/InterestOnly.asp

http://www.moneychimp.com/articles/finworks/fmfutval.htm

http://www.bankrate.com/brm/calc/cdc/CertDeposit.asp

http://mathforum.org/library/topics/interest_calc/

http://www.bankrate.com/brm/calculators/investing.asp

http://www.bankofinternet.com/interest-calculator.aspx

http://www.1728.com/compint.htm

http://math.about.com/library/blcompoundinterest.htm