Calculate your new share count and price per share after a forward or reverse stock split.
A stock split increases (or decreases) the number of shares outstanding while proportionally adjusting the price. Your total investment value stays the same — you just own more shares at a lower price (forward split) or fewer shares at a higher price (reverse split).
For example, in a 4-for-1 split: 100 shares at $400 becomes 400 shares at $100. Total value remains $40,000. Companies like Apple, Amazon, and Tesla have done major stock splits to make their shares more accessible to retail investors.
The main reason is accessibility. A $400 stock price might discourage small investors (even with fractional shares available). Splitting to $100 feels more approachable. Splits also increase liquidity and can signal management confidence. Historically, stocks tend to outperform the market in the 12 months following a split announcement.
Yes — your cost basis per share is divided by the split ratio, but total cost basis stays the same. Use our Stock Average Calculator to recalculate.
Reverse splits reduce share count and increase price. They're often done by struggling companies to maintain exchange listing requirements. A 1-for-10 reverse split turns 1,000 shares at $1 into 100 shares at $10.
Track stock splits across the S&P 500
Browse Stocks →