How do I record the diameter of the tree?

Using a flexible measuring tape (e.g. tailor’s tape; flexible to curve around the tree trunk) at 1.4 metres (roughly chest height) wrap the tape around the tree. This will give you the circumference of the tree. To convert the circumference into diameter, divide the number you get by 3.14 (pi). This will give you the Diameter at Breast Height, or DBH, which is the standard measure of tree diameter. If the tree trunk forks below chest height, measure the trunk of the fork that has the hollow in it. If you can’t find a measuring tape that is flexible enough, you can use string or rope, and then lay that string down against a measuring tape on the ground. 

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