Stock Split Calculator
$
Split Ratio
New Shares200
New Price per Share$100.00
Total Value (unchanged)$20,000.00
A stock split changes the number of shares you hold and the price per share without changing the total value of your position. This calculator takes your current shares, the price, and a split ratio such as 2-for-1 or a reverse 1-for-10, then multiplies your share count by the ratio and divides the price by the same ratio. Your holding value stays the same before and after.
Formula
ratio = num ÷ den; newShares = shares × ratio; newPrice = price ÷ ratio
- num / den
- Split ratio numerator and denominator (e.g. 2 and 1)
- shares
- Shares owned before the split
- price
- Price per share before the split
- newShares / newPrice
- Share count and price per share after the split
How it works
- Enter the number of shares you own, the current price per share, and the split ratio as a numerator and denominator (for example 2 and 1 for a 2-for-1 split, or 1 and 10 for a 1-for-10 reverse split).
- The calculator forms the ratio (numerator ÷ denominator), multiplies your shares by it to get the new share count, and divides the price by it to get the new price per share.
- It also shows the total position value, computed from your original shares and price, which is unchanged by the split.
Worked example
You own 100 shares priced at $150 each and the company announces a 2-for-1 split.
- Ratio: 2 ÷ 1 = 2.
- New shares: 100 × 2 = 200; new price: 150 ÷ 2 = $75.
- Position value: 100 × 150 = $15,000, the same as 200 × 75.
After the split you hold 200 shares at $75 each, with the position value unchanged at $15,000.
Frequently asked questions
- How do I enter a reverse stock split?
- A reverse split reduces share count, so the numerator is smaller than the denominator. A 1-for-10 reverse split is entered as numerator 1 and denominator 10, which turns 1,000 shares at $2 into 100 shares at $20.
- Does a stock split make me richer?
- No. A split is purely cosmetic for value: you own more (or fewer) shares at a proportionally lower (or higher) price, and your total position value is identical immediately before and after.
- Why do companies split their stock?
- Forward splits lower the per-share price to make the stock look more accessible and improve liquidity. Reverse splits raise the price, often to meet an exchange listing minimum or to shed a low-price image.