💰 Compound Interest Calculator
Find out how much your savings or investment could grow over time with the power of compound interest.
How compound interest works
Compound interest means you earn interest not only on your original balance, but also on the interest that has already been added to it. The more frequently interest compounds, and the longer your money stays invested, the more it can grow.
How this calculator works
Enter your starting amount, expected annual interest rate, how long you plan to save or invest, and how much you add each month. Choose how often interest compounds (monthly is common for savings accounts, while some investments compound quarterly or annually). The calculator adds your contributions and applies interest for each compounding period across the full time span.
This tool is for general planning and education. Actual returns depend on your specific account, fees, and market conditions, and are not guaranteed.