Compound Interest Calculator
Visualize the exponential power of compounding returns. Model growth on savings accounts, certificates of deposit (CDs), index funds, and stock portfolios with daily, monthly, quarterly, or annual compounding and recurring monthly contributions.
About Compound Interest Calculator
Visualize the exponential power of compounding returns. Model growth on savings accounts, certificates of deposit (CDs), index funds, and stock portfolios with daily, monthly, quarterly, or annual compounding and recurring monthly contributions.
Primary Purpose: Calculate compound interest and future wealth growth over time
How to Use the Compound Interest Calculator
- 1Enter Initial Balance and optional Monthly Contribution.
- 2Select Expected Annual Return (%) and Investment Horizon (Years).
- 3Choose Compounding Frequency (Annual, Semi-Annual, Monthly, Daily).
- 4Inspect the final balance and annual growth breakdown.
Formula & Methodology
P = initial principal, r = annual interest rate, n = compounding frequency per year, t = time in years.
Real-World Worked Examples
$10,000 initial + $200/month at 8% for 20 years
Frequently Asked Questions
What is the Rule of 72?
The Rule of 72 is a mental shortcut to estimate how many years it takes to double your money: divide 72 by the annual interest rate (e.g. at 8%, money doubles in ~9 years).
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