Free compound interest calculator: see how your investments grow over time with daily, monthly, or yearly compounding. Calculate future value, total interest, and plan your retirement savings.
The compound interest calculator shows how your investments grow over time with the power of compounding. Compounding means your investment earns returns on both the original principal and previously earned returns — creating exponential growth.
This calculator supports different compounding frequencies (daily, monthly, quarterly, annually) and regular monthly contributions. Use it to compare investment strategies, understand the impact of compound frequency, and plan for long-term financial goals. The growth chart visualizes how your balance, contributions, and earnings change over time.
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It accelerates growth over time.
More frequent compounding periods (daily vs. annual) generate higher returns because interest is calculated on interest more often. Daily compounding yields slightly more than monthly or annual compounding.
The Rule of 72 is a quick way to estimate how long an investment takes to double. Divide 72 by your annual interest rate. For example, at 8% interest, it takes approximately 72/8 = 9 years to double your money.