Finance calculator

Compound Interest Calculator

Project future value from a starting balance, regular monthly contributions and compound growth.

Your figures stay on this device

Inputs

Enter your numbers

Currency Changes display formatting only; no exchange rate conversion. Starting balance Use zero or positive numbers. Monthly contribution Use zero or positive numbers. Annual interest rate % Use zero or positive numbers. Years Use zero or positive numbers. Compounds per year Choose an option.

Under the hood

Understand the number

Use the formula and notes below to check whether the result fits your real operating conditions.

Formula

Future Value = Principal × (1 + r/n)^(n×t) + monthly contribution series

Variables

Principal: Starting balance.
Annual Rate: Nominal annual growth rate.
Monthly Contribution: Amount added at the end of each month.

How to use it

Enter a realistic current order or SKU, then compare the result with your target.

Change one variable at a time to see which operational lever matters most.

Limitations

The projection assumes a constant rate and end-of-month contributions. It excludes taxes, fees, inflation and market volatility.

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FAQ

Are my inputs stored?

No. Calculator inputs run in your browser and are not submitted.

When was this checked?

Last reviewed on August 26, 2026. Changing third-party fees should be verified from official sources.

Sources

For carrier dimensional weight and marketplace fees, verify current official documentation before operational use.