Stock Split Calculator
Shares and price after stock split.
Calculate new share count and price after stock split. Free educational calculator with the math explained step by step.
What this tool does
Enter shares owned, current price, and split ratio. The tool shows new share count and price.
Enter Values
Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Stock splits divide existing shares. 100 shares at 400 with 4:1 split = 400 shares at 100. Total value unchanged. Common before and after large companies (Apple, Tesla, etc).
Run it with sensible defaults
Using shares owned of 100, current price of 400, split ratio of 4, the calculation works out to 400. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Shares Owned, Current Price, and Split Ratio — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.
How the math works
Shares multiply by ratio, price divides by ratio. Total value unchanged. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".
Why investors run this
Most people's intuition for compounding is wrong — not because the math is hard, but because linear thinking doesn't account for curves. Running numbers through a calculator like this one is the cheapest way to recalibrate that intuition before making an irreversible decision about contribution rate, asset mix, or retirement age.
What this doesn't capture
Steady-rate math ignores real-world volatility. Actual returns are lumpy; sequence-of-returns risk matters most in drawdown; fees and taxes drag on compound growth; and behaviour changes in drawdowns can reduce outcomes below the projection. Treat the number as one scenario, not a forecast.
Related calculations worth running
Plans get firmer when you triangulate. Alongside this one, the stock split value calculator, the asset allocation calculator, and the dividend reinvestment calculator tend to come up in the same conversations. Running two or three together exposes inconsistencies in any single assumption — which is usually where the useful insight lives.
Stock split produces new state based on the inputs provided.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Shares multiply by ratio, price divides by ratio. Total value unchanged.
References
Frequently Asked Questions
Why split stocks?
Reverse split?
Tax implications?
Effect on dividends?
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