A tree caliper is a special caliper to measure the diameter at breast height of a tree. When used in landscaping, the term "caliper" can refer to the diameter of a tree's trunk at breast height itself. The measurement is generally made at 4.5 feet to 5 feet above the soil.

What does 4 caliper tree mean?

Caliper is the diameter of the trunk, measured at 6 inches above the soil line, on trees that measure 4″ caliper or smaller. Over 4″ caliper trees are measured 1 foot from the soil line. Grade is a level of plant quality that meets minimum standards.

What does 2 inch caliper tree mean?

Smaller nursery-sized trees that are readily transplanted are usually measured by their “trunk caliper” (diameter) anywhere from 6 to 12 inches above the soil surface, depending on their caliper size. Example: a 2 to 2-1/2 inch caliper tree is measured 6 inches above the ground.