“What If I Had Bought” Stock Calculator (splits & dividends: Samsung, SK hynix…)

How it works

Shares bought = whole shares the amount could buy at the buy price; the rest stays as cash. Shares now = shares bought × split ratio. Value now = shares now × current price + dividends received (dividends per original share × shares bought, not reinvested) + leftover cash. Total return = (value − amount) ÷ amount; annual return (CAGR) = (value ÷ amount)^(1 ÷ years) − 1, with years = days held ÷ 365.25. Enter the actual (unadjusted) price on each date together with the split ratio, or enter split-adjusted prices and a ratio of 1 — never both. Fees and taxes are ignored. Independent calculator, not affiliated with the companies named. Not investment advice; past returns do not guarantee future returns.

⚠ Estimates for information only — not financial advice.

FAQ

Where can I get past share prices?

KRX Data Marketplace (data.krx.co.kr) lists the official daily closing price of every Korean stock. Many charts show split-adjusted prices — if you use those, set the split ratio to 1.

Does this include reinvested dividends?

No. Dividends are added as cash. Reinvesting them would usually give a somewhat higher result when the price rose.

Checked 11 Nov 2026. Holding-period return and compound annual growth rate (standard definitions, e.g. CFA Institute, Quantitative Investment Analysis). Prices: enter official closing prices from KRX Data Marketplace (data.krx.co.kr). Samsung Electronics 50-for-1 stock split effective May 2018 (company disclosure, 2018).