How to Use the Stock Split Adjustment Calculator
A stock split hands existing shareholders extra shares for free, and the share price adjusts down by the same factor so the total value of your position doesn't theoretically change. Enter the pre-split price, split ratio, and shares held, and this calculator returns the post-split price along with how many new shares you'll end up holding.
The post-split price equals the pre-split price divided by (1 + the split ratio) — for example, entering a ratio of 0.5 (equivalent to a 3-for-2 split) turns 100 shares into 150 shares, while the price adjusts down to 1 ÷ 1.5 of its prior value. Unlike a rights offering, there's no subscription price to account for, since no cash changes hands and nothing is actually issued for a price.
In practice, markets sometimes treat a split as a bullish signal — a sign management expects the price to keep rising, or a move meant to improve liquidity by making shares more affordable to smaller investors — so the actual post-split price can drift somewhat above or below the pure theoretical adjustment shown here.
Frequently Asked Questions
Post-split price equals the pre-split price divided by (1 + the split ratio). A stock split hands out extra shares for free, and the price adjusts down by the same factor.
A stock split just increases the number of shares outstanding without changing the company's actual value — it's meant to lower the per-share price and improve liquidity, not create new value.
In theory, only the share count changes and total value is unchanged. In practice, markets sometimes read a split as a bullish signal or as improving liquidity, so the price can end up somewhat higher or lower than the pure theoretical adjustment.