You can use the app to forecast how much interest you might earn on your savings, investment, or 401(k) over a period of years and months. Here's how to do it: 1. Enter the initial principal; 2. Enter the interest rate (annual); 3. Enter the term (number of years); 4. Select the compounding type (monthly, quarterly, annually); 5. Enter any additional periodic deposit (the same frequency as compounding); 6. Choose the beginning or end of the period for the deposit; Disclaimer: Whilst every effort has been made in developing the app, please always seek a professional opinion before making an investment. We are not to be held liable for any damages or monetary losses arising out of or in connection with their use.