Big trees on the Vermont list are scored by taking the circumference in inches added to the height in feet which is then added to 1/4 of the average crown spread.
"Big trees fascinate people and catch their attention. When they first see them they are often amazed at how they look. We can visit our big trees and learn from them. After we visit a big tree we wonder how it got there. What was the history of this tree and how did it manage to live so long? There can also be the sheer beauty of the massive structure and the thick rough bark. Big trees are a small minority in any forest or among urban trees and they stand out. We enjoy visiting big trees either alone or with a group of people. There are big trees that are almost as big as our record trees and it is worth visiting them as well. Branch Out Burlington (B.O.B.) and Windham County forester Bill Guenther conduct tree walks and tours."
Freeman, J.V. Vermont's Largest Trees. Green Mountain Division, New England Society of American Foresters. Urban and Community Forestry Program Vermont Department of Forests, Parks and Recreation. Vermont Tree Society. 2003