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Stock split calculator

Your shares, the price and your average cost after a split or a reverse split.

Free, no sign-up On sale: Desk and Desk + Signals. See the plans

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The shares and the split

For a 3-for-1 split: 3 and 1.
For a 1-for-10 reverse split: 1 and 10.

After the split

After the 3-for-1 split, 100 shares at 300 become 300 shares at 100. Still worth $30,000.00.

Your average cost
250 becomes 83.3333 a share; your total cost stays $25,000.00.
Options and orders
Open orders are often cancelled on the split date; option contracts are adjusted by the exchange.

Education only, not investment advice. The answer comes from the numbers you typed in, not from your account or the market. Simulated results are hypothetical and have limits: real trading has slippage, gaps, changing results and emotions. Trading leveraged products can lose money quickly, including all of it. Risk warning

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Educational only, not financial advice; trading involves risk.

A split changes the count, not the value

In a 3-for-1 split, every share becomes three, and the price is cut to a third. 100 shares at 300 become 300 shares at 100: still 30,000. A reverse split goes the other way, often for a company whose price has fallen a long way. Charts and your broker's average cost are adjusted, so compare prices from before the split with care.

To find your average cost after several buys, use the average price calculator; for a sale's result after costs, the stock profit calculator.

Not advice or tax advice. Arithmetic on the numbers you type; how part shares are paid out depends on the broker.

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