A split changes the share count and price but not your total value. Enter your shares, the current price and the split ratio (e.g. 4:1 forward, or 1:10 reverse) to see your new share count, adjusted price and per-share cost basis.
Forward split: new > old (e.g. 4 for 1). Reverse split: new < old (e.g. 1 for 10).
Answer first: a stock split is purely cosmetic accounting — it slices your existing pie into more (or fewer) pieces without changing the size of the pie. In a 4-for-1 forward split, every share becomes 4 shares worth one-quarter the price; your total position value, and the company’s market cap, are exactly the same the moment after as the moment before.
New shares = Old shares × (new ÷ old) · Adjusted price = Old price × (old ÷ new)
Example: 100 shares at $800 in a 4:1 split become 400 shares at $200 — still $80,000. Your cost basis per share is divided by 4 as well, so total gains and taxes are unaffected.
A forward split (4:1, 3:1, 2:1) lowers the share price to make a stock feel more affordable and improve liquidity — popular after a big run-up. A reverse split (1:10, 1:20) does the opposite, combining many shares into one to raise the price. Reverse splits are often defensive: companies use them to stay above the $1 minimum price that exchanges like the Nasdaq require for continued listing.
Mechanically, no — you own the same fraction of the same company. But splits can have second-order effects. A lower post-split price can widen the pool of buyers and modestly increase trading activity, and historically some stocks have drifted higher in the months around a high-profile forward split (often because only strong, rising companies split in the first place). A reverse split, by contrast, frequently carries a negative signal, because it usually follows a long price decline.
A split is not a taxable event. Your total cost basis stays the same; only the per-share figure changes, divided or multiplied by the same ratio as the shares. This calculator shows the adjusted per-share basis so your future capital-gains math stays correct — check the result against the capital gains tax calculator when you eventually sell.
Reality check: fractional shares from uneven splits are typically paid out in cash or rounded by your broker, which can create a tiny taxable amount. A split never adds or destroys value by itself — be wary of hype that treats a split as “free” money. Educational tool only — not financial advice.
Read what is a stock split for the full story, and value the company with the market cap, P/E ratio and EPS calculators.
Last updated 27 June 2026 · Written by Mustafa Bilgic. Educational only — not financial advice.
Multiply your share count by the split ratio. In a 4-for-1 split, 100 shares become 400, and the price is divided by 4, so the total value is unchanged.
No. A split changes the number of shares and the price proportionally, leaving your total position value and the company's market cap exactly the same. It is a cosmetic change, not new value.
A reverse split combines multiple shares into one, raising the price per share. For example, a 1-for-10 reverse split turns 100 shares at $0.50 into 10 shares at $5. It is often used to meet an exchange's minimum-price listing rule.
No. A split does not trigger capital gains tax. Your total cost basis stays the same and only the per-share basis is adjusted by the split ratio. Tax applies only when you actually sell.