The standard (CR80) ID card size is 3.375″ by 2.125″ (85.6mm by 54mm). The thickness of a standard ID card is 30mil. This is the same size as a standard credit card.

CR80 standard ID card size

There are other, less common, ID card size standards such as CR79 and CR100. The CR79 card is 2.051”× 3.303” (52mm × 83.9mm). The CR100 card is  2.63”× 3.88” (66.8mm × 98.6mm).

CR79, CR80, CR100 ID card comparative size

InstantCard prints all ID cards on CR80 card stock. Most badge holders and wallets are designed for the CR80 size standard.