When you have an amount of money, which is your  principal or initial investment,  that you want to deposit in a bank or invest, and you want to calculate what interest rate (nominal and effective) would give a future amount of money after a number of years (months, days, weeks), this free calculator comes to your aid. 
You can specify:
How the Loan is compounded: per year or yearly, quarterly, weekly, annually, daily
It can be useful for calculating: deposits, investments, debts, mortgages, savings or other financial services.