Toolorio

Compound Interest Calculator

Enter your starting amount, monthly contribution, interest rate and time frame to see how your money could grow, visualized on a live chart.

144,573
Final balance
58,000
Total contributions
86,573
Total interest earned
036,14372,286108,430144,573Yr 0Yr 3Yr 7Yr 10Yr 13Yr 17Yr 20
Balance Contributions only

This is an estimate based on a fixed rate of return with no fees or taxes deducted — actual investment returns vary and are not guaranteed.

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How to use

  1. Enter your initial amount and any monthly contribution you plan to add.
  2. Enter the expected annual interest rate, compounding frequency and number of years.
  3. See your final balance, total contributions and total interest earned, plotted on the growth chart.

What is this tool?

Compound Interest Calculator projects how an initial amount plus regular monthly contributions grows over time at a given interest rate, compounding at the frequency you choose. The chart plots your total balance against your total contributions, making it easy to see how much of your final balance comes from interest rather than money you put in.

Common uses

  • Projecting how a savings or investment account could grow over time
  • Comparing the long-term effect of different contribution amounts
  • Understanding how compounding frequency affects total returns
  • Visualizing how much of long-term growth comes from compound interest versus contributions

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FAQ

What does compounding frequency mean?

It's how often interest is calculated and added to your balance — daily, monthly, quarterly or annually. More frequent compounding produces slightly higher returns for the same annual rate, since interest starts earning interest sooner.

Are contributions added before or after interest is applied?

This calculator adds your monthly contribution at the end of each month, after that month's interest has been applied to the existing balance.

Does this account for fees, taxes or inflation?

No. This is a simplified projection using a fixed rate of return with no fees, taxes or inflation adjustment — real-world investment returns vary and involve risk that this calculator doesn't model.