Compound Interest Calculator
Project future value from principal, recurring contributions, return rate, compounding frequency, and time.
Growth inputs
Combine an initial principal with recurring contributions and a compounding assumption.
5M KRW
300K KRW
Projected result
Principal, contributions, and interest are separated for a quick scan.
Year-by-year projection
Balances update from the same input assumptions.
| Year | Final balance | Total contributions | Interest earned |
|---|---|---|---|
| 1 | ₩9,009,058 | ₩3,600,000 | ₩409,058 |
| 2 | ₩13,265,385 | ₩7,200,000 | ₩1,065,385 |
| 3 | ₩17,784,234 | ₩10,800,000 | ₩1,984,234 |
| 4 | ₩22,581,795 | ₩14,400,000 | ₩3,181,795 |
| 5 | ₩27,675,260 | ₩18,000,000 | ₩4,675,260 |
| 6 | ₩33,082,878 | ₩21,600,000 | ₩6,482,878 |
| 7 | ₩38,824,026 | ₩25,200,000 | ₩8,624,026 |
| 8 | ₩44,919,276 | ₩28,800,000 | ₩11,119,276 |
| 9 | ₩51,390,467 | ₩32,400,000 | ₩13,990,467 |
| 10 | ₩58,260,788 | ₩36,000,000 | ₩17,260,788 |
About Compound Interest Calculator
The Compound Interest Calculator is a free, browser-based tool that projects the future value of an investment from an initial principal, recurring contributions, an annual return rate, compounding frequency, and a time period. It runs entirely in your browser, so the numbers you enter never leave your device.
It is useful for anyone estimating how savings or an investment might grow over time, such as planning a regular deposit into a fund or pension and seeing how compounding affects the total.
Enter your starting principal, a contribution amount and how often you add it (none, monthly, quarterly, or yearly), the expected annual return rate, the compounding frequency, and the number of years. The tool separates final balance, initial principal, total contributions, interest earned, and effective growth, and shows a year-by-year projection table so you can scan the growth path.
Amounts are shown in KRW, and the results are estimates for reference only, not professional financial advice. Market returns are not guaranteed, and taxes and fees are not included, so actual outcomes will differ.
Frequently asked questions
- How is compound interest calculated here?
- The tool simulates growth month by month, applying the periodic return on your chosen compounding schedule and adding recurring contributions at their selected frequency, then sums principal, contributions, and interest at the end of each year.
- Does it account for taxes or inflation?
- No. It is a general compound-interest estimate that does not include taxes, fees, or inflation, so treat the final balance as a reference figure rather than a guaranteed net result.
- Is my financial data saved or sent anywhere?
- No. All calculations happen locally in your browser, and the values you enter are not uploaded or stored on any server.