Compound Interest Calculator
Calculate how your investments grow with compound interest over time.
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Enter your values and the result appears here
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About this calculator
Compound interest is what happens when your money earns money, and then that money earns even more money. It is the reason investing early can make such a huge difference over time. Albert Einstein supposedly called it the eighth wonder of the world — whether he actually said that or not, the math speaks for itself. Our calculator shows you exactly how your investments can grow with compounding and regular contributions.
The formula, explained simply
The core idea is simple: you earn interest on your original investment plus any interest that has already been added. We calculate the future value using the compound interest formula, accounting for how often interest compounds (daily, monthly, yearly) and any additional monthly contributions you make. The result shows your final balance, how much you contributed, and how much came purely from interest.
When you would use this
Retirement planning is the big one — see what your 401(k) or IRA could look like in 20, 30, or 40 years. Parents calculate college savings. Anyone comparing savings accounts or investment options can see which one grows faster. It is also a great tool for showing younger people why starting to save early matters so much.