Balled and bur lapped trees are measured by their caliper. The caliper of a tree is measured by the thickness of the trunk, so a 2" caliper tree means that the trunk is 2 inches across. The height ranges depending on the tree. Typically, a 2" shade tree is going to be much taller than a 2" ornamental tree, because their height now is relative to their mature height. Here are some examples using approximate heights:
2" caliper = approx. 12-14ft tall
2.5" caliper = approx. 14-16ft tall
3" caliper = approx. 16-18ft tall
3.5" caliper = 18-20+ ft tall
2" - 2.5" caliper = approx. 8-10ft tall
2.5" - 3" caliper = approx. 10-12ft tall
A clump tree or evergreen tree is measured by height. A clump tree, like a River Birch, is a close group of trees with multiple trunks. A 10-12' Tall Clump River Birch means that the size of the tree will range from 10 to 12 feet tall at the time of planting. With evergreen trees, we measure to the top cluster of branches, not to the very tip of the highest needles. This ensures that you are getting a tree that is truly the height you are looking for. An 8ft Tall Douglas Fir means that the tree will be 8ft Tall to the top cluster of branches. All trees are measured from the top of their root ball, meaning they height we state is the height of the tree after it is planted in the ground.