There three basic sizes of chain saws: lightweight, midweight and heavyweight. The lightweight can cut trees with a circumference of 6 to 10 inches, advises the University of South Dakota. The midweight cuts 14 to 18 inch trunks. The heavyweight cuts trunks 20 inches or larger, informs the University of South Dakota.
About this Author
Lisha Smith writes for several blogs and has freelanced for six years. She has a Bachelor of Arts from UNC-Greensboro in psychology. Smith has self-published several books. Her areas of experience include gardening, cooking, home improvement, pets and mental health.