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Compound Interest Calculator

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Forecast the future value of your savings or investments over time with compound interest. Includes initial deposit, monthly contributions, and compounding frequencies.

Browser-based: this tool works on your device and does not send your input to an Alona Tool server. See the Privacy Policy for details.
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Example Usage & Test Cases

Retirement fund
Input Scenario:
$10,000 initial + $500/mo at 8% for 20 years
Generated Result:
Future Value: $349,045 (Total Interest Earned: $219,045)

How It Works

1

Calculates future value using standard compound interest formula with periodic deposit additions: FV = P*(1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1) / (r/n)].

Frequently Asked Questions

Daily compounding yields slightly more than monthly or annual compounding due to faster interest reinvestment.

Good to Know

Common uses

  • Seeing how savings could grow under a fixed assumed rate

Limitations and notes

  • Returns are assumptions, not predictions. Taxes, fees and inflation are not included.

Results are general estimates and are not professional financial, tax, legal or medical advice. See the Disclaimer.

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Compound Interest & Future Value Growth Calculator

See the exponential power of compounding interest on your monthly investment portfolio.

Key Highlights:

  • Initial principal + recurring contributions
  • Compounding frequency (Annually, Monthly, Daily)
  • Visual balance growth chart