Stock Split Calculator — Forward & Reverse Splits
A stock split changes the number of shares and the price per share, but not the total value of your holding. Enter how many shares you own, the current price, and the split ratio (e.g. 2-for-1) to get your new share count and adjusted price after the split.
$
2-for-1 split — total portfolio value is unchanged
- 1
Split ratio
2 ÷ 1 = 2 - 2
New price per share
200 ÷ 2 = 100 - 3
Shares after split
100 × 2 = 200Total portfolio value is unchanged by the split.
How does this calculator work?
New Shares = Old Shares × (N/D). New Price = Old Price × (D/N). Total portfolio value is unchanged. A 2-for-1 split doubles shares and halves the price; a 1-for-5 reverse split cuts shares to one-fifth and multiplies the price by five. Enter share count, current price, and ratio to get the post-split figures instantly.
Formula
How this is calculated
A forward stock split (e.g. 2-for-1, 3-for-1, 4-for-3) multiplies your share count by the split ratio and divides the price by the same ratio. If you own 100 shares at $200 and the company announces a 2-for-1 split, you will hold 200 shares at $100 — exactly the same total value of $20,000. Companies typically split to make the share price more affordable and improve liquidity without changing fundamental value.
A reverse stock split (e.g. 1-for-5 or 1-for-10) does the opposite: your share count shrinks while the price rises proportionally. 100 shares at $2 after a 1-for-10 reverse split becomes 10 shares at $20. Companies use reverse splits to lift a share price that has fallen below exchange listing thresholds or to project a more institutional price point.
In both cases the split ratio is expressed as new shares : old shares. The calculation leaves total portfolio value mathematically unchanged because markets simultaneously re-price shares on the ex-split date. In practice, there may be fractional share cash-outs and minor tax events — check your brokerage statement after the split date.
Frequently asked questions
No. A split only changes the number of shares and the price per share — your total holding value stays exactly the same on the day of the split. Over time the price may move up or down based on the company's performance, but the split itself neither creates nor destroys value.
Your total cost basis is unchanged, but it is spread across the new (larger) number of shares. So your cost basis per share is divided by the split ratio. Brokerages adjust your records automatically on the effective date, but it is worth checking your statement to confirm the correct figures for tax purposes.
A reverse split reduces the share count and raises the price proportionally. Companies use them to meet stock exchange minimum price requirements (e.g. Nasdaq's $1 minimum), to attract institutional investors who avoid very low-priced stocks, or to reduce the number of shareholders after a take-private transaction.
Also known as
TG we-Calculate Editorial Team. (2026). Stock Split Calculator — Forward & Reverse Splits [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/stock-split-calculator
TG we-Calculate Editorial Team. "Stock Split Calculator — Forward & Reverse Splits." TG we-Calculate. 2026. https://we-calculate.com/calculator/stock-split-calculator.
TG we-Calculate Editorial Team, "Stock Split Calculator — Forward & Reverse Splits," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/stock-split-calculator
@misc{wecalculate_stock_split_calculator, title = {Stock Split Calculator — Forward & Reverse Splits}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/stock-split-calculator}}, year = {2026}, note = {TG we-Calculate} }
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