FinanceCalcs
Stock Split Calculator
A stock split changes the number of shares you own and adjusts the price proportionally — your total portfolio value doesn't change. Calculate the exact effect of any forward or reverse stock split on your shares, price, and holdings.
Enter your current position and split ratio — see your new share count, adjusted price, and full holding summary.
Stock Split Calculator
2-for-1 Forward Split
New Share Count:
- Before
- After
Before & After Summary
| Metric | Before Split | After Split |
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Lot-by-Lot Analysis
| Lot | Old Shares | Old Basis | New Shares | New Basis | Value |
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"A stock split is like cutting a pizza into more slices — you have more pieces, but the same amount of pizza."
— Investing Basics
How stock splits work
A forward stock split increases the number of outstanding shares while proportionally decreasing the price per share. A 2-for-1 split means every existing share becomes two shares, each worth half the original price. Your total investment value is unchanged — only the number of shares and price per share change. Companies typically split when their share price has risen so high that it may deter small investors from buying whole shares.
Apple has split its stock five times since going public (most recently 4-for-1 in 2020). Google (Alphabet) did a 20-for-1 split in 2022 when shares were trading above $2,700. Tesla executed a 3-for-1 split in 2022. In each case, the total market cap was unchanged — the split simply made individual shares more accessible to retail investors.
A reverse split works in the opposite direction: shares are consolidated at a ratio like 1-for-10, so 100 shares become 10 shares at 10× the price. Reverse splits are more often a negative signal — they're commonly used by companies whose share price has fallen so low it risks being delisted from an exchange (typically below $1). A company doing a reverse split to avoid delisting is in a very different situation than Apple splitting to increase accessibility.
lightbulb Stock Split Examples
| Company | Split | Year | Price Before |
|---|---|---|---|
| Apple (AAPL) | 4-for-1 | 2020 | ~$500 |
| Tesla (TSLA) | 3-for-1 | 2022 | ~$900 |
| Alphabet (GOOGL) | 20-for-1 | 2022 | ~$2,750 |
| Amazon (AMZN) | 20-for-1 | 2022 | ~$2,785 |
| Nvidia (NVDA) | 10-for-1 | 2024 | ~$1,200 |
All forward splits. Total shareholder value unchanged at time of split.
Stock Split FAQs
Does a stock split make me richer?
Not directly — the total value of your holding is unchanged at the moment of the split. However, stocks that split have historically outperformed the market in the 12 months following the split, likely because splits signal management confidence and increased liquidity tends to attract more buyers. This is correlation, not causation, and past patterns don't guarantee future returns.
What happens to my options in a stock split?
Options are adjusted to reflect the split. In a 2-for-1 split, the number of contracts doubles and the strike price is halved. Your total position value remains the same. Your broker handles these adjustments automatically. Check your specific broker's documentation for the mechanics.
What is a reverse stock split and is it bad?
A reverse split reduces share count and increases price proportionally. It's often done to avoid delisting when a stock price falls below exchange minimums (usually $1). While not inherently bad — some healthy companies do reverse splits for strategic reasons — they're frequently a sign of financial distress. Research the company's fundamentals, not just the split mechanics.
Do I owe taxes on a stock split?
No. A stock split is not a taxable event in the United States. Your cost basis is adjusted proportionally across the new shares. Taxes are only triggered when you sell shares (capital gains) or receive dividends (ordinary income). Keep records of your adjusted cost basis for each lot, as brokers occasionally make errors in split adjustments.
Stock split terminology
Forward Split
A split where shares are multiplied. A 3-for-1 split means each share becomes 3 shares, each worth one-third of the original price. Total market cap and individual investor value are unchanged. The purpose is typically to reduce the per-share price and increase liquidity and accessibility.
Reverse Split
A split where shares are consolidated. A 1-for-10 reverse split means 10 shares become 1 share worth 10× the price. Often done to boost share price above exchange listing minimums or improve institutional perception. Can also be done to reduce the number of shareholders (by cashing out fractional shares).
Cost Basis Adjustment
When a stock splits, your cost basis per share is divided by the split ratio (forward) or multiplied by it (reverse). This maintains the same total cost basis for tax purposes. Example: 100 shares at $300/share ($30,000 total) in a 3-for-1 split become 300 shares at $100/share ($30,000 total). Your adjusted cost basis is $100/share.
Fractional Shares
When a split produces a fractional share (e.g., you own 101 shares in a 3-for-2 split — 101 × 1.5 = 151.5 shares), the fractional portion is handled differently by each broker. Most either round down and cash out the fraction at market price, or credit you with a fractional share if supported. Check with your specific broker.
Disclaimer: All calculators on this site are provided for informational and educational purposes only. Results are estimates based on the inputs you provide and mathematical formulas — they do not account for taxes, fees, inflation, risk, or other real-world factors that may affect financial outcomes. Past performance does not guarantee future results. Nothing on this site constitutes financial, investment, legal, or tax advice. Always consult a qualified professional before making financial decisions.
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