Compound interest calculator
Project monthly compound growth with recurring contributions. Compare principal and growth and export the table.
Processed in this browser · nothing is uploaded
Result
Ready when you areEnter your input and run the tool to see your result here.
View schedule · CSV available
Good to know
Compounds monthly at the nominal annual return divided by 12. Assumes constant returns, excluding taxes, fees and inflation; actual investment returns are not guaranteed. Displays whole KRW.
Initial amount (KRW): 1000000 Monthly contribution (KRW): 100000 Nominal annual return (%, −100–100): 6 Term (months, 1–600): 12 Contribution timing: end
Understand and use your results
Separate your contributions from compound growth when adding money each month. Compare savings assumptions without treating the projection as a forecast for an investment product.
How to use it
- Enter an initial amount, monthly contribution, nominal annual return and duration.
- Choose whether contributions arrive at the beginning or end of each month.
- Inspect year-end and final-month contributions and gains in the table or CSV.
Worked example
1,000,000 KRW · no contributions 12% nominal annual return · 12 months
Final value: 1,126,825 KRW Contributions: 1,000,000 KRW Gain: 126,825 KRW
The monthly rate is 1%, applied 12 times: 1,000,000 × 1.01¹². Intermediate calculations retain precision; displayed values are rounded to KRW. Beginning-of-month contributions earn growth in that month.
Will a real investment reach the projected value?
Actual returns fluctuate and may include losses, taxes, fees and inflation. The nominal annual rate (−100% to 100%) is divided by 12; −100% therefore means −8.333…% per month. Supports 1–600 months and values up to 1,000 trillion KRW. Consider other risks when making investment decisions.