Compound Interest Calculator
Calculate compound investment growth, monthly deposit compounding, APY returns, and long-term wealth projections.
What is Compound Interest Calculator?
Compound interest occurs when interest earned on an initial investment is reinvested to generate additional earnings over time. Our Compound Interest Calculator models long-term wealth accumulation by computing future balances across various compounding intervals (annual, semi-annual, quarterly, monthly, daily) with optional ongoing monthly contributions in client-side memory.
Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.
How to Use the Compound Interest Calculator
- 1Enter your Initial Investment Principal and ongoing Monthly Contribution amount.
- 2Specify the Estimated Annual Interest Rate (%) and the Investment Timeframe in years.
- 3Select your Compounding Frequency (e.g., Monthly, Daily, or Annually).
- 4Inspect the projected Future Portfolio Balance, Total Interest Earned, and Year-by-Year Growth Table.
Formula & Calculation Logic
Combines lump-sum compound interest with future value of annuity formula, where P = Principal, PMT = Monthly Deposit, r = Annual Rate, n = Compounding Periods Per Year, and t = Total Years.
Future Value: A = P(1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1) / (r/n)]Compound Interest Calculator Frequently Asked Questions
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