Enable your desired columns in List & Table view by clicking on the plus sign
Hover under a row of tasks and click
calculateto find the fields' sum, average or range
This will work for both standard fields (ex: time logged, time estimated), as well as numeric custom fields that you create.
Once you add a calculation, you'll see results for each group in List & Table view, as well as a calculation for the entire column:
How to calculate an entire column
Eliminate grouping and just see one calculation for your entire column!
Click on a column header in List & Table view to apply sorting
sort entire column
3. You can then add a calculation for your entire column!