About six inches.

The average plate used at home is about six inches, and the one-inch plate is about 2.5 to 3 centimeters. However, if you have a large number of people in your family, you need to buy a larger cold dish plate. After all, there are more people and the portions of the dishes are larger. Of course, if you are more particular about yourself, you can also choose the style of the cold dish plate.