Why is my formula only returning whole numbers?

If you're performing a calculation on integers, then only integers will be returned. If you want your results to have decimal precision you'll need to convert your data type to decimal.

Fortunately this is quite easy to do.

Open your Chart in the Data Explorer. Edit your calculated column in the Data Pipeline, and multiply your formula numerator by 1.0, like so:

(1.0 * "Column 1")/"Column 2"