Compound Interest Calculator
See how your money grows over time with this interactive compound interest calculator. Enter your starting amount, interest rate, and time horizon — then experiment with different compounding schedules (yearly, quarterly, monthly, or daily) and factor in recurring deposits to model a real savings or investment plan.
Growth Over 0 Years
Yearly Breakdown
| Year | Starting Balance | Deposits | Interest | Ending Balance |
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What Is Compound Interest?
Compound interest is the interest you earn on both your original balance and on the interest that balance has already earned. That snowball effect is why small, consistent contributions can grow into significant wealth over long timelines.
The Compound Interest Formula
The standard formula is A = P(1 + r/n)^(nt), where A is the final amount, P is the starting principal, r is the annual rate, n is the compounding frequency per year, and t is the number of years. This calculator handles the math for you and shows the result in an interactive chart.
Compounding Frequency Matters
Daily compounding grows slightly faster than monthly or yearly compounding because interest starts earning interest sooner. The difference is usually small over a few years but becomes more noticeable over decades.
Why Time Is the Key Ingredient
The longer your money stays invested, the more powerful compounding becomes. Starting early—even with a small amount—often beats investing more money later because early dollars have more time to multiply.