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Real-world workflow

Use Case

Adjust Holding for Stock Split or Bonus

Add a split or bonus event to the Stock Investment Return Calculator and see how share count and value change while cost basis stays the same.

25 August 2026 By Tools.Town Team 5 min read

Steps

  1. Open the Stock Investment Return Calculator.
  2. Enter buy price, amount invested, and today’s (post-event) price per share.
  3. Under Corporate actions, click + split or + bonus.
  4. For a split, enter from→to (e.g. 1 and 2). For a bonus, enter X:Y (e.g. 1 and 1).
  5. Optional: set the event date and buy/as-of dates so the timeline and CAGR make sense.
  6. Read Shares (after events) and the timeline.

Frequently Asked Questions

Where do I get the ratio?

From the company announcement, exchange notice, or your broker’s corporate-action history.