Choose a calculation mode.
Adjust the settings for your task.
Compound interest calculator
Calculate capital growth, a target, or a trade series with reinvestment.
Scenario result
Set the conditions and select Calculate.
This is a scenario calculation, not a return forecast. Real trading can result in a loss.
How to use
Set the scenario conditions.
Run the tool with its primary action.
Review the chart and table or download CSV.
Use the result or run it again.
ABOUT THE TOOL
Compound interest calculator for investing and trading
Compare capital growth scenarios and see how contributions, withdrawals, costs, and reinvestment change the result.
When it helps
- Capital growth with regular contributions
- Time to a financial target
- Trade series with partial reinvestment
How to get a result
- Choose a calculation mode.
- Set the scenario conditions.
- Review the chart and table or download CSV.
How to build a compound interest scenario you can check
Start with the cash amount available today and a rate that uses the same period as the compounding schedule. Then add contributions, withdrawals, and costs separately so their effect remains visible.
A projection is only as good as its assumptions
Small rate changes can produce large differences over long periods. Test a conservative case alongside the preferred case, and inspect the table rather than relying only on the final balance. For trading scenarios, include losing periods and transaction costs when they are part of the strategy.
- Match the rate period to the compounding period.
- Separate deposits from investment returns.
- Include recurring costs and planned withdrawals.
- Export CSV when you need to compare scenarios outside the browser.
What the result does not guarantee
The calculator applies the entered rules consistently, but it cannot predict future returns or remove market risk. Taxes, inflation, fees, and timing can change real outcomes. Treat the result as a planning model, not as financial advice or a promised return.
Frequently asked questions
What can the calculator model?
It can calculate capital growth, time or rate needed for a target, and a series of trades with contributions, withdrawals, costs, and partial reinvestment.
Can I include regular contributions?
Yes. Add recurring contributions or withdrawals and compare how their timing changes the projected balance.
Can I export the calculation?
Yes. Review the chart and detailed table, then download the scenario as a CSV file.
Is the result financial advice?
No. The output is a mathematical projection based on the values you enter. It does not predict returns, taxes, inflation, or market risk unless you model them explicitly.