Stock Split Calculator

Calculate how a stock split affects your shares and price.

For a 2-for-1 split, enter 2

For a 2-for-1 split, enter 1

New Shares = Old Shares x (New Ratio / Old Ratio)\nNew Price = Old Price x (Old Ratio / New Ratio)\nTotal Value = Old Shares x Old Price
Example:\n100 shares @ $200/share\n2-for-1 split\n\nNew Shares = 100 x (2/1) = 200 shares\nNew Price = $200 x (1/2) = $100/share\nTotal Value = $20,000 (unchanged)

What is a stock split?

A corporate action that increases the number of shares while proportionally decreasing the share price, keeping total value constant.

Does a stock split change my investment value?

No. Your total investment value remains the same. You own more shares at a lower price per share.

What is a 2-for-1 split?

For every 1 share you own, you receive 2 shares. The price is cut in half. Enter 2 for new shares, 1 for old shares.

What is a reverse split?

Reduces shares and increases price. For a 1-for-5 reverse split, enter 1 for new shares and 5 for old shares.

Why do companies split stocks?

To make shares more affordable for investors, improve liquidity, and attract more buyers at a lower price point.

How do I calculate fractional shares?

This calculator handles fractional shares. If you end up with 50.5 shares, brokers typically handle the fraction or cash it out.

Are stock splits taxable?

No. Stock splits are not taxable events. Your cost basis per share is adjusted proportionally.

How does this affect my cost basis?

Cost basis per share = Original cost basis / split factor. Total cost basis stays the same.

Can I use this for reverse splits?

Yes. For a 1-for-10 reverse split, enter 1 as new shares and 10 as old shares.

What happens to dividends after a split?

Dividends per share are typically adjusted proportionally. Total dividend amount may remain similar.