30 centimeters = 11.811 inches
1. A standard American ruler is approximately 12 inches, making 30 centimeters just under the length of a ruler.
2. The average diameter of a dinner plate is around 10-11 inches, so 30 centimeters is slightly longer.
3. The width of a standard piece of printer paper is 8.5 inches, making 30 centimeters almost 3 inches longer.
4. A large smartphone, such as an iPhone 11, typically has a length of around 6-7 inches, making 30 centimeters almost double its size.
5. The average length of a playing card is 3.5 inches, making 30 centimeters over 3 times its length.