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Stock Split Adjustment Calculator

Work out stock split adjustment instantly with clear inputs, formula shown and shareable results.

About Stock Split Adjustment Calculator

A split multiplies the share count and divides the price by the same ratio, leaving the value of your holding unchanged. The cost basis per share must be divided too, so that any eventual capital gain is measured correctly.

Formula

Split adjustment

New shares = old × ratio; new price = old price / ratio; basis divided by the ratio

Worked example

With the default values below, Stock Split Adjustment Calculator returns Shares After The Split of 1,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Shares Heldaccepts 1–100,000,000
200
Price Before The Splitminimum 0
2,400
New Shares Per Old Shareaccepts 1–100
5
Original Cost Per Shareminimum 0
1,800

Results

Shares After The Split
1,000
Price After The Split
$480.0000
Value Of The Holding
$480,000.00
Adjusted Cost Per Share
$360.0000

Step by step

  1. 1Values used
  2. 2Split adjustment
  3. 3Shares After The Split= 1,000
  4. 4Price After The Split= 480.0000
  5. 5Value Of The Holding= 480,000.00
  6. 6Adjusted Cost Per Share= 360.0000

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Figures are estimates for planning only. Market returns are not guaranteed, and rates, limits and tax rules change. This is not financial or tax advice — speak to a qualified adviser before acting.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates for planning only. Market returns are not guaranteed, and rates, limits and tax rules change. This is not financial or tax advice — speak to a qualified adviser before acting.

Frequently Asked Questions

Does a split create value?

No. It only changes the units. Any price reaction is about signalling and improved liquidity, not economics.

Why adjust historic prices?

So charts and return calculations remain comparable across the split date.

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