Stock Split Calculator

Calculate how a stock split or reverse split changes your share count, cost basis, and position value. Keeps your tax records accurate after any split event.

Shares Owned

Cost Basis per Share ($)

Current Market Price ($)

Split Ratio (new : old) — e.g. 3:1 = 3-for-1 split, 1:5 = 1-for-5 reverse split

Before Split

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cost basis/share

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position value

After Split

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cost basis/share

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position value (unchanged)