Compound Interest Calculator

Free compound interest calculator with monthly/quarterly/annual compounding. See how your savings and investments grow over time.

Free compound interest calculator with monthly/quarterly/annual compounding. See how your savings and investments grow over time.

The Magic of Compound Interest

Albert Einstein reportedly called compound interest the "eighth wonder of the world." When your interest earns interest, growth becomes exponential. $10,000 at 7% becomes $76,123 in 30 years — without adding a penny.

How Compounding Frequency Matters

Monthly compounding earns slightly more than annual. $10,000 at 7% annually = $19,672 after 10 years. Monthly = $20,097. The difference grows with larger amounts and longer time periods.