A high interest savings account interest calculator can help you estimate how much interest you’ll earn over time based on your deposit amount, interest rate, and compounding frequency. To use it, simply input your initial deposit, the annual interest rate, and the period you plan to keep your money in the account. The calculator will then show you the projected interest earnings. Remember to compare different accounts, as rates can vary widely, and consider checking with your bank or financial advisor for the best options available.