While looking at my Caly3 I wondered what convention is typically used to measure the length of a blade, especially knives with a choil. For a knife with a choil it seems to me like there are two main ways to measure its blade length. One is to measure the straight line from the tip of the blade to front of the handle. Another method involves measuring the the straight line from the tip the blade to the farthest portion of the choil (blade) that juts out from the handle.
From what I can remember for the Caly3, these measurements yield blade lengths of approximately 3" and 3.2", respectively. Spyderco lists its blade as 3" so I can safely assume that they use the first method.
I am wondering if there is an accepted convention for measuring this length? From a legal standpoint, this measurement might be important in some areas.