Compound Interest Calculator

Calculate how your investments grow over time with compound interest. Perfect for planning long-term investments like S&P 500.

Investment Details

Initial Investment Amount

Annual Return Rate

Historical S&P 500 average: ~10% annually

Investment Period (Years)

Quick Examples

Enter your investment details to see the results

How Compound Interest Works

Formula: A = P(1 + r)^t

Where: A = Final Amount, P = Principal (Initial Investment), r = Annual Interest Rate, t = Time in Years

Compound interest means you earn interest on both your original investment and the interest you've already earned. This creates exponential growth over time, making it one of the most powerful tools for building wealth.