Add-on: List Number Format
With this Gravity Forms Add-on you can change List Field columns into a number field, do calculations in within a row or column. Extra merge tags are available with total counts of columns.
Calculation Merge Tags – List Field Calculations
This documentation explains how to perform list field calculations in Gravity Forms using merge tags. Learn to calculate row totals, column sums, and row counts.
Enable Number Format
Configure List Field Number Format, pick Rounding options and direction, Range and enable Range instructions or Column Total.