A split makes each share cheaper without changing the company’s value. Apple (4-for-1 in 2020) and Nvidia (10-for-1 in 2024) split to make shares more accessible. Reverse splits (e.g. 1-for-10) reduce the share count and raise the price.
How to use the Stock Split Calculator
- Number of shares before
- Share price before
- Split ratio – new shares
- for … old shares
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter your shares and the price before the split, and the split ratio (for example 3-for-1).
Tips
- Take figures from the same financial statements and the same fiscal year.
- Compare ratios with companies in the same industry, not across industries.
- Use several valuation measures together; no single ratio tells the whole story.
- Market prices change every second – refresh the share price before you rely on a result.
Common mistakes to avoid
- Mixing per-share figures with company totals.
- Using trailing earnings for one company and forward earnings for another.
- Forgetting dilution from options and convertible securities.
Inputs explained
| Field | What to enter |
|---|---|
| Number of shares before | A number |
| Share price before | Amount in your currency |
| Split ratio – new shares | A number |
| for … old shares | A number |
What each result means
- Number of shares after = [Number of shares before]×[Split ratio – new shares]÷[for … old shares]
- Share price after = [Share price before]×[for … old shares]÷[Split ratio – new shares]
- Value of your shares (unchanged) = [Number of shares before]×[Share price before]
Example values
How the main result changes when Number of shares before changes and everything else stays at the example values above:
| Number of shares before | Number of shares after |
|---|---|
| 25 | 250 |
| 37.5 | 375 |
| 50 | 500 |
| 62.5 | 625 |
| 75 | 750 |
| 100 | 1,000 |
Formula
Shares after = shares before × new ÷ old (e.g. 2-for-1: × 2)Price after = price before × old ÷ newValue before = value afterWorked example
Inputs — Number of shares before: 50; Share price before: $900; Split ratio – new shares: 10; for … old shares: 1.
Results — Number of shares after = 500; Share price after = $90.00; Value of your shares (unchanged) = $45,000.00.
Frequently asked questions
Does a stock split change my investment's value?
No – you get more shares at a lower price.
What is a reverse split?
Combining shares into fewer, higher-priced shares, e.g. 1-for-10.
Why do companies split stock?
To make share prices more accessible and improve liquidity.
What formula does the Stock Split Calculator use?
Shares after = shares before × new ÷ old (e.g. 2-for-1: × 2).