Calculate compound interest on your investments
Calculate compound interest growth showing how invested money exponentially increases over time through reinvested earnings. Enter your principal investment, expected annual return percentage, investment period in years, and any monthly contributions to project investment value. Compound interest is the eighth wonder of the world because small, regular investments create enormous wealth over decades. Each year you earn interest on your principal AND on previous interest earned, creating exponential growth. A $20,000 investment at 10% annually grows to $25,937 in 10 years and $67,275 in 20 years. Adding just $500 monthly dramatically increases final values through consistent contributions. Understand the power of starting earlyâinvesting $10,000 at age 25 versus 35 creates substantially different outcomes by retirement age 65. The calculator demonstrates why retirement planning should start as early as possible. Higher return assumptions significantly increase projected wealth but come with higher risk. Adjust assumptions to see scenarios with different returns, contributions, or timelines. The tool is perfect for retirement planning, education savings, wealth projection, and investment strategy development. All calculations are instant and completely private.
A: Yes, this tool is completely free with no hidden costs, subscriptions, or premium features. Use it unlimited times.
A: Yes, all calculations happen on your device. Your data is never stored or transmitted to any external servers.
A: No registration is required. Simply visit and start using immediately.
A: Yes, the tool works on all devices including smartphones, tablets, and computers through any modern web browser.