In Dungeons & Dragons 5e, a dragon’s miniature base size corresponds to its creature size category, which scales with age: Wyrmlings use a 1-inch (25mm) base (Medium), Young dragons use a 2-inch (50mm) base (Large), Adults use a 3-inch (75mm) base (Huge), and Ancients use a 4-inch (100mm) base (Gargantuan).