What is size of napkins?

Napkin sizes can vary, but standard dinner napkins typically measure around 18 inches by 18 inches (45 cm by 45 cm) when folded. Cocktail napkins are usually smaller, measuring about 5 inches by 5 inches (12.7 cm by 12.7 cm) when folded. Other sizes can be found for specific occasions or uses, but these are the most common dimensions.