Flexible investing tool

Compound Interest Calculator

Leave any numeric field blank. A blank starting amount, contribution, interest rate, variance, or time period is treated as zero—so an entirely blank calculator correctly returns $0.

Your assumptions

Use positive contributions to add money and negative contributions to model regular withdrawals.

Blank means no initial investment.
Blank means no monthly contribution.
Decimals are allowed; blank means zero years.
Blank means a 0% annual return.
Optional. Blank shows only the base estimate.
Monthly contributions are added at month-end.

Estimated ending balance

$0.00

0 years
Total principal $0.00
Investment growth $0.00
Effective annual yield 0.00%
Low estimate $0.00
Base estimate $0.00
High estimate $0.00
Enter a time period to see the balance grow over time. All blank inputs currently produce $0.
Year-by-year breakdown
Year Principal Growth Balance
0$0.00$0.00$0.00

This calculator provides estimates, not investment advice or a guarantee of future results. It does not account for taxes, fees, inflation, or irregular market returns. Negative contributions are modeled as month-end withdrawals.