Compound Interest Calculator
Project how your savings or investments grow over time with compound interest and regular contributions.
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Total Contributed--
Total Interest Earned--
How it works
Enter a starting amount, an annual interest rate, and a time period, and the calculator projects the final balance using monthly compounding. Add an optional monthly contribution to see how consistent saving accelerates growth. The calculator adds each contribution before applying the next month's interest, so your money starts earning immediately.
Frequently asked questions
What compounding frequency does this use?
Monthly compounding, which is a common assumption for savings accounts and many investment projections.
Can I include regular contributions?
Yes, enter an optional monthly contribution and it's added at the end of each month before interest is applied for the following month.