Project investment or savings growth with recurring contributions, variable compounding frequency and a clear contribution versus growth breakdown.
Use current balances, rates, payments, income, costs, or tax figures that match the scenario. The compound interest tool uses those values to produce an estimate you can compare and plan around.
Enter Starting amount, Monthly contribution, Annual return or interest rate, Years, and the other fields shown. Project investment or savings growth with recurring contributions, variable compounding frequency and a clear contribution versus growth breakdown.
The result shows how the starting balance changes under the rate, time period, and compounding assumptions entered.
Compound growth applies interest to the starting principal and, over time, to previously earned interest. The result depends on the stated rate, compounding frequency, time horizon, and any additional contributions modeled by the page.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.
The ending balance can include the starting amount, later contributions and estimated growth. Separate contributions from growth when evaluating the result.
Not necessarily. A calculator often uses a steady assumed rate for modeling. Real investment returns can vary widely from year to year.
Later growth can be calculated on a larger balance that already includes earlier growth. That compounding effect becomes more noticeable over longer periods.
Want the context behind the numbers?
See how compound growth changes over time →