There are a few ways that you can count your chainsaw teeth. The most common way is to use a ruler or tape measure. Simply line up the teeth with the markings on the ruler, and count how many teeth there are between each mark. For example, if there are four marks on the ruler, and you count 10 teeth, then your saw has 40 teeth.
Another way to count your chainsaw teeth is to use a piece of string or twine. Place the string over the top of the saw blade, making sure that it goes through all of the holes in the blade. Then, simply count how many times the string goes around the blade. This method is especially useful if you have a large number of teeth to count.
Finally, you can also use a digital caliper to measure the length of each tooth on your chainsaw blade. Simply line up one end of the caliper with the tip of one tooth, and then press down on the other end until it reaches the base of that tooth. Record this measurement, and then repeat for every tooth on your saw blade. Once you have all of your measurements, simply add them up to get your total number of teeth