The 30cm dinner plate is 12 inches.

The inch the dinner plate is talking about refers to inches , and an inch is equal to 2. 54 centimeters.

30 centimeters is 30 centimeters. Converted to centimeters it is: 30/2.54 = 11.8 (inches).

The dinner plate is generally 6 inches, 7 inches, 8 inches, 12 inches, etc. are whole numbers. No 11.8 inches, is not accurate enough to measure the size, omit the number after the decimal point. 12-inch dinner plate that 12 * 2.54 = 30.48 cm. So a 30 centimeter dinner plate is a 12 inch dinner plate.

Different foods need to be placed in different sizes of Western-style dinner plates:

1, general 6-inch: diameter of about 15CM size is suitable for snack plates / snack plates.

2, 7 inches: diameter of about 19.5CM size suitable for pastry inner plate / snack plate.

3, 8 inches: diameter of about 20.5CM size suitable for cake plate/salad plate.

4, 10 inch: diameter of about 26CM size suitable for steak plate.