Measure the finished card, not the label
Card width and height are normally recorded in millimetres. Format names such as poker, bridge, tarot, mini, Euro, or square are useful search terms, but they are not a production specification. Record the finished trim size, corner radius, stock, coating, and whether sleeves are part of the required fit.
How to apply it
Use a reference size to begin layout, then verify with the printer’s template and a physical sample. A 63 × 88 mm card, for example, needs a different box and sheet-planning input from a 57 × 89 mm card even when both are casually described as standard formats.
Questions and decisions
Supplier templates may define bleed, safe area, corner treatment, and tolerances differently. Do not use sleeve product names as proof of a card’s final fit; test the chosen sleeve with a production-like sample.
Next step
Use the linked tools with your project’s documented inputs, retain the source or quote date beside the scenario, and update the decision when the specification changes.