The relationship between card size (in inches) and actual card size (in millimeters) can be expressed by the following mathematical formula: card size (in inches) = (actual card size (in millimeters) /25.4 This formula explains how to convert actual card size into inch size.

Substitute the actual card size of 63.5×88mm into the above formula, and you can get the answer. The calculation result is that the size of the card is 2.5×3.46 inches.