Free Compound Interest Calculator
Calculate compound interest with optional monthly contributions. See year-by-year growth, total interest earned, and final balance across multiple compounding frequencies. No signup required.
100% free — no account needed
Free Compound Interest Calculator Features
Visualize the power of compound interest
Year-by-Year Table
See balance, interest earned, and contributions for each year.
4 Frequencies
Daily, monthly, quarterly, or annual compounding options.
Monthly Contributions
Add optional recurring monthly deposits to see accelerated growth.
3 Currencies
Calculate in USD ($), EUR (€), or GBP (£).
FAQ
What is compound interest?
Interest calculated on both the initial principal and accumulated interest from previous periods. Your money earns interest on its interest — exponential growth.
How often should interest compound?
More frequent compounding = slightly more growth. Daily vs annual makes a small difference for typical rates. Monthly is most common for savings accounts.
Why do monthly contributions matter?
Regular contributions dramatically accelerate growth. Even small monthly additions compound over time, often contributing more than the initial principal.
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