12.51 centimeters is equal to 4.92 inches.
To put this into perspective, the average length of a credit card is 3.37 inches, making 12.51 centimeters about 1.5 times longer than a credit card.
A standard paperclip is approximately 1.15 inches long, so 12.51 centimeters would be over 4 times longer than a paperclip.
A typical apple has a diameter of about 2.5 inches, which is just over half the length of 12.51 centimeters.