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.
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.
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.
We use the compound interest formula: A = P(1 + r/n)^(nt), where P is principal, r is the annual rate, n is compounding frequency, and t is time in years. For retirement projections, we factor in inflation-adjusted returns using historical S&P 500 data from NYU Stern.
Past performance does not guarantee future results. Actual investment returns vary based on market conditions, fees, and asset allocation. Consult a licensed financial advisor for personalized planning.