30 cm is about the length of a standard school ruler and is just slightly shorter than one foot.

Basic size

• 30 cm equals 300 millimeters or 0.3 meters.

• In inches, 30 cm is about 11.8 inches, which is just under 12 inches (one foot).

How it looks in real life

• A typical classroom ruler is 30 cm long, so 30 cm is that full ruler length.

• It is similar to the length of a shoebox or roughly the distance from your elbow to your wrist for many adults.