Pokémon cards have a standard size of approximately 2.5 inches wide by 3.5 inches tall (63 mm × 88 mm). This size is consistent with most trading card games like Magic: The Gathering and sports cards, making it convenient for storage, display, and gameplay

. There are also larger promotional "Jumbo" Pokémon cards, which come in two main size variations:

• Jumbo cards from 2000 to 2020 measure about 5.7 inches by 7.87 inches (145 mm × 200 mm).
• Jumbo cards from 2020 to 2023 are slightly smaller, measuring about 5.37 inches by 7.37 inches (136.5 mm × 187.3 mm)

The standard size allows players and collectors to use common accessories like sleeves, binders, and deck boxes without compatibility issues, and it ensures fairness in gameplay and tournaments