The length of your cutting equipment is measured by the number of chain drive links, in inches (") or centimeters (cm).
The chainsaw usually has a certified range of cutting equipment lengths.
You can often find the length of the saw guide on the beginning of the blade.
Example Husqvarna
You can read from this:
Item Number: If you enter this with us on this website you will get the correct one right away.
Length: 15" / 38cm this is not the total length of the blade, but about what sticks out of the saw where you can really saw.
Pitch: 0.325"
Number of underbites: 64
Blade groove width: 0.50" / 1.3mm
Symbol next to groove width means that you can see at a glance that it is about a pixel blade or 1.3mm
Example Oregon
If you can't find the data. Due to wear on the blade, you can count the drive links on your chain. Then all you need to know is the pitch and thickness of the drive links