Before:
![](https://www.thedataschool.co.uk/content/images/2021/06/1-1.png)
After:
![](https://www.thedataschool.co.uk/content/images/2021/06/2.png)
- In the data pane, right click on the field (in this example, Weight) and click duplicate
- Put the newly copied field onto the Text shelf
- Go to Worksheet at the top left of Tableau and click on Tooltip
- Place the copied field onto the tooltip as desired
- Right click on the view and click on Format
- Format the fields' decimal places as desired e.g. in the Axis tab for the original field and the Pane tab for the copied field