Free Compound Interest Calculator

Albert Einstein reportedly called compound interest the "eighth wonder of the world." Use our calculator to see why. Visualize how small, regular investments can grow into massive wealth over time thanks to the snowball effect of compounding.

How Compound Interest Works

Unlike simple interest which is calculated only on the principal amount, compound interest is calculated on the principal plus the accumulated interest from previous periods. This means your money earns money on itself.

Key Factors

Compounding Frequency: How often interest is added. Daily compounding grows faster than annual compounding.
Time Horizon: The longer you leave the money, the more dramatic the growth curve becomes.
Interest Rate: Even a 1-2% difference in rate can result in double the returns over 30 years.