A credit card is 0.03 inch thick. Credit cards are 3.37 inches wide by 2.125 inches high. All credit cards have this thickness because they conform to requirements set out by the International Organization for Standardization.
The corners of credit cards should be rounded. These size and shape standards are the same for automated teller machine cards, debit cards and many identification cards.
The International Organization for Standardization includes thousands of other non-governmental organizations and inter-governmental organizations. It attempts to create standards so that economies across several countries can work together. Its efforts are important so that the global economy can thrive.