Paid Workspaces can calculate numeric fields in List view and Table view to find their sum, average, or range!
What you'll need
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Workspaces on the Unlimited Plan and above can calculate columns.
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Everyone, including guests, can calculate columns.
Calculate columns
To calculate a column:
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In any List or Table view, click the + icon to show existing columns or add additional columns.
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Hover over any numeric column to reveal the Calculate button at the bottom of it.
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Select Sum, Average, or Range.
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Click Calculate.

This will work for both standard fields as well as numeric Custom Fields that you create.
Once you add a calculation, you'll see results for each group in your List view, as well as a calculation for the entire column. Table views will show a calculation for the entire column.

Calculate an entire column
Eliminate task grouping to see one calculation for your entire column:
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Click on a column header in a List or Table view to open the column settings menu.
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Select Sort entire column to remove any grouping applied to the List view and sort tasks by the selected field.
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Select Sum, Average, or Range.
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Click Calculate.
Updated