Free · Equity investment calculators 📈

Share Split Count & Theoretical Price Calculator

Apply a forward or reverse split ratio to share count and theoretical share price.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

A 3-for-2 split changes 100 shares at 60 each into 150 shares at a theoretical 40 each. Both sides total 6,000 before any market movement or cash settlement.

New shares = old shares × new-ratio units ÷ old-ratio units; adjusted price = old price × old-ratio units ÷ new-ratio units

Worked example

Enter these known values and leave the other values blank.

Shares before split
100
Price before split
60 USD
New shares in split ratio
3
Old shares in split ratio
2
Shares after split
150
Theoretical price after split
40 USD

Assumptions and limitations

  • This is a proportional adjustment with unchanged theoretical total holding value. It does not predict the traded price after the corporate action.
  • The model retains fractional shares. Actual treatment may include cash in lieu or other rules stated by the issuer or broker. It does not calculate taxes, fees or share-class changes.
  • Share counts and both ratio entries must be positive; prices may be zero. A reverse split uses a smaller new-share numerator than old-share denominator.

Common questions

How do I enter a 1-for-10 reverse split?

Enter 1 as the new-share ratio and 10 as the old-share ratio. For 100 old shares at 6 each, the arithmetic gives 10 new shares at a theoretical 60 each.

Does the split itself increase my holding’s value?

Under the proportional model, no. Share count and price change inversely. Actual market trading and the treatment of fractional shares can affect the eventual holding.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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