Stock Split Calculator

A stock split is represented as a ratio (e.g., 2-for-1, 3-for-1, etc.). The first number indicates how many shares you will have after the split, and the second number indicates how many shares you had before the split.

To calculate the new number of shares, multiply the number of shares you owned before the split by the first number in the ratio and divide it by the second number. For example, in a 2-for-1 split, you would double the number of shares you own.

The share price will be adjusted inversely to the split ratio. For example, in a 2-for-1 split, the price will be halved.

To calculate the cost basis after a stock split:

• Determine the split ratio: As in the previous answers, understand the split ratio.
• Adjust the cost basis: If your original cost basis per share was C and the split ratio is A-for-B, the new cost basis per share will be C × B / A.

For example, if you originally bought shares at $100 each and the stock underwent a 2-for-1 split, the new cost basis would be $100 × 1 / 2 = $50 per share. The overall cost basis remains the same, but the per-share cost basis changes according to the split ratio.

If you want to calculate stock values after a reverse split, consider checking the Reverse Stock Split Calculator.