[BetterRed]

Originally Posted by theducks

Then you would need to export (eg calibredb --list) as a CSV to a spreadsheet as Calibre has no provision to add (multiply or divide)

See ==>> Calibre template language - Function classification

• Arithmetic
  • add(x, y)
  • divide(x, y)
  • multiply(x, y)
  • subtract(x, y)

There's also this recently posted plugin ==>> [GUI Plugin] Sum Column

BR