Before you start
You need permission to manage apps, products and the theme in Shopify. Work on a duplicate theme first. Confirm whether one unit in your Shopify inventory represents one box or one individual tile. Automatic quantity synchronization is suitable only when one cart unit represents the package used by the calculator.
Keep the manufacturer’s tile dimensions, pieces per box and published box coverage nearby. Published coverage is preferable to nominal dimensions when the two differ. Estimates are purchasing aids; layout, cuts, breakage, installation methods and project conditions still need professional judgment.