Web width formula
Required web = (label width × labels across) + (gap × (labels across − 1)) + (2 × side trim)
If you enter an available web width, the calculator solves the same geometry in reverse to show the maximum whole number of labels that fit across.
What counts as side trim?
Side trim is the unusable or intentionally retained material outside the outermost label columns. Your die-cutting and converting process may require more than the visual margin shown on a proof, so use the production value for your press or die.