How big is ID-1 credit card?
For this comparison, ID-1 credit card measures 8.56 cm in length (3.37 in). Nominal long side of the ISO ID-1 format, 85.60 mm.
The standard format defines the card’s outside dimensions, not its printed design.
Put the measurement in perspective
The recorded length is 0.05 times the height of A 1.70 m person (1.7 m). This is a ratio of the labelled linear dimensions. It does not describe weight, area or volume.
Use the interactive comparison to see both drawings on one shared scale. You can choose another reference or enter your own height. If the sizes are very far apart, the smaller object may be almost invisible; an intermediate reference makes the progression easier to inspect.
Measurement source
Standards body, sports federation or manufacturer
The note above explains the specific value selected. Drawings are schematic; the stated measurement determines the scale. Report a measurement issue.
Check the convention
Some equipment is governed by an allowed range rather than one exact size. Defined everyday references and any derived diameters are explicitly labelled in the note.
Read our methodology for the selection and scoring rules. Practise these dimensions in the everyday objects size guessing game.