Stock Split Calculator
Quickly estimate the number of shares (and new share price) you'll end up with after a stock split. Works for reverse splits too.
Results
- New stock price
- $0.00
- Additional shares
- +
- Total shares
What is a stock split?
A stock split is a corporate action where a company increases the number of its outstanding shares by issuing more shares to current shareholders, typically to make shares more affordable without changing the overall value of the investment. In a 5-for-4 split, you'd receive 5 shares for every 4 you currently own, and the stock price adjusts accordingly.
Stock splits don't change your market value. They simply adjust the share count and price proportionally.
How to calculate a stock split
New share count = Old share count × (New ratio ÷ Old ratio)
New stock price = Old stock price × (Old ratio ÷ New ratio)
Example: if you own 100 shares at $100 each and the company announces a 5:4 split, your new share count is 100 × (5 ÷ 4) = 125 shares, and the new stock price is $100 × (4 ÷ 5) = $80.
Frequently asked questions
Does a stock split increase the value of my investment? +
No. Stock splits don't change the total value of your investment. They only change the number of shares you own and the price per share.
What happens to fractional shares in a split? +
In many cases, fractional shares are either rounded or compensated with a small cash payment. It depends on your broker or the company policy.
Can reverse stock splits be calculated here? +
Yes, just enter a ratio like 1:10 for a reverse split. The calculator will update accordingly.
Why do companies do stock splits? +
Common reasons include improving liquidity, attracting new investors, or making shares appear more affordable.
Track corporate actions automatically
Zentrix MCP feeds your AI agent live split, dividend, and price data, no manual recalculating after every announcement.