Tree diameter from circumference
DBH (Diameter at Breast Height) is the standard forestry measurement, taken at 4.5 feet above ground. If you can only measure circumference, divide by π (3.14159) to get diameter.
Diameter = Circumference / π
Last updated: April 13, 2026
Tree Diameter Calculator
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Measured at 4.5 ft (1.37 m) above ground.
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