Interest Calculator You can use our Interest Calculator to develop a savings plan.* Enter your Beginning Balance or the amount of money you will use to open your savings account. Enter an APY of at least 0.01% or greater. Dollar Bank Interest Rates can be found here. Enter the Number of Years that you expect to keep this money in your savings account. Enter your Regular Contribution or the amount you plan to deposit regularly. Choose the Frequency of your contribution by clicking the arrow. Click Calculate to see the results. Beginning Balance: APY: Number of Years: Regular Contribution: Frequency: Weekly Monthly Annually *Please note that this calculator is for educational purposesonly and does not represent an offer for any product.