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Compound interest calculator online tool showing principal rate time and estimated growth

Compound Interest Calculator

See how interest compounds on savings or investments over time.

Investment inputs

Monthly contributions use a monthly compounding approximation. This is a general illustration, not financial advice.

How to Use the Compound Interest Calculator in 5 Steps

  1. 1

    Enter the principal amount.

    Add the starting balance.

  2. 2

    Enter the supported interest rate.

    Specify the rate used in the calculation.

  3. 3

    Enter the time period.

    Add the supported duration.

  4. 4

    Choose the supported compounding setting.

    Select how often interest compounds.

  5. 5

    Run the calculation and review the result.

    Inspect the estimated growth.