Compound Interest Calculator
See how your money grows over time with the power of compounding.
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Future Value
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Total Contributions
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Total Interest Earned
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Growth Over Time
Year-by-Year Breakdown
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How Compound Interest Works
Compound interest is often called the "eighth wonder of the world" — and for good reason. Unlike simple interest which only earns on your original principal, compound interest earns interest on your interest. This creates exponential growth over time.
The formula is: A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)] where P is principal, r is annual rate, n is compounding frequency, t is years, and PMT is periodic contributions.
The key takeaway: the earlier you start, the more time compounding has to work in your favor. Even small monthly contributions can grow into substantial wealth over decades.