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
Project growth from an initial balance, recurring contributions and a fixed assumed return.
Select contribution and compounding frequency. On a month when both occur, this model compounds first and then adds the contribution.
Use scenarios to understand the effect of time and contributions; the result is not a forecast or a product recommendation.
The calculation or rendering runs in this browser tab. Copy, download and share actions make the chosen output available outside this tab.
Worked example
- Input / settings
- 1,000,000 KRW; no contributions; 10% annual return; yearly compounding; 2 years
- Action
- Calculate
- Result
- Final balance 1,210,000 KRW; growth 210,000 KRW.
Calculation model
Without contributions: FV = P × (1 + r/m)^(m×y). With contributions, the calculator iterates monthly, compounds at the selected interval and then adds scheduled payments.
Scope and limits
- 1–100 whole years. Return is an input assumption; taxes, fees, inflation and variable market returns are omitted. Negative contributions are not supported.
Frequently asked questions
- Are contributions invested at the start of the period?
- No. Scheduled contributions are added after that step’s compounding, so the model uses end-of-period contribution timing.
Sources and review dates
- SEC Investor.gov compound-interest calculator Reviewed
Reference for principal, contributions and compounding; this page uses its own stated timing model.
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