DBH Calculator

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Special Laws Dealing With DBH & Circumference:

There are certain laws that apply to the removal of trees based on the tree’s dbh & circumference. Use the table below to see if any special laws apply to your tree removal project.


Special Trees14in DBH/44in Circumference – 31.8in DBH/99.9 Circumference
Heritage Trees31.84in DBH/100 Circumference & Up

DC Special Tree Permit information can be found here: http://ddot.dc.gov/page/ddot-special-tree-removal-permit

What Is DBH?

Diameter at breast height (dbh) is a standard method of measuring the size of a tree. This measurement is taken at the height of an adult’s breast, hence the name. In the United States, this measurement is taken at 4.5 feet above the ground. This measurement in an important factor in determining the price of tree care services, the amount of chemical needed in plant health care treatments, and the amount of time the treatment will take.