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Stock Split & Cost Basis Adjuster Formula Breakdown
Corporate division factor (e.g. 10.0 for a 10-for-1 forward split, or 0.1 for a 1-for-10 reverse split).
Pro-rated original purchase price per share used by the IRS to calculate taxable capital gains.
Updated quantity of shares credited to the shareholder's brokerage account.
Real-time position value (New Shares × Current Share Price) and cumulative dollar/percentage profit.
How to Calculate Stock Split Calculator Step-by-Step
Input original number of shares acquired and original purchase price per share.
Select or input corporate split ratio (e.g. 2-for-1, 4-for-1, 10-for-1, or reverse split).
Multiply original shares by the split ratio to determine the new total share count.
Divide original price by the split ratio to compute the new split-adjusted cost basis per share.
Multiply new shares by current market price to display real-time position value and cumulative capital gains.
How to Interpret the Result
Frequently Asked Questions
How does a 10-for-1 stock split work?
In a 10-for-1 split, for every 1 share you owned, you now own 10 shares. If the stock traded at $1,000, each share is now priced at $100. Your total holding value remains identical ($1,000).
What is a reverse stock split?
In a reverse split (e.g. 1-for-10), shares are merged together to increase the nominal stock price. If you owned 10 shares at $1, you now own 1 share at $10. Often used by troubled companies to avoid exchange delisting.
How does a stock split affect dividends?
The dividend per share is divided by the split ratio. If a company paid $4.00 per share and executes a 4-for-1 split, the new dividend is $1.00 per share, keeping total dividend cash flow unchanged.
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