Tree Diameter Calculator (DBH)

Your details

Wrap a soft tape around the trunk at 1.37 m (4.5 ft) above ground on the uphill side. Do not include the tape in the measurement.
in
If known, enter the one-side bark thickness to get diameter under-bark (DUB). Leave 0 to skip.
in
Select the closest species to get an estimated tree age. The growth factor method (age = DBH inches x growth factor) gives an approximation, not a precise count.
Diameter at breast height (DBH)Saw timber class
15.92

Tree trunk diameter measured at 1.37 m (4.5 ft) above ground

DBH (display unit)15.92 in
Trunk radius7.96 in
Basal area (single tree)1.3815 ft²
Estimated tree age~64 years (Northern red oak, gf 4)
15.92 in DBH
Seedling / sapling<5Pole timber5-11Saw timber11-21Large saw timber21-36Old-growth class36+

DBH is 15.92 in - saw timber class.

  • DBH is 15.92 in, placing this tree in saw timber class.
  • Based on species growth factor: ~64 years (Northern red oak, gf 4).
  • Single-tree basal area: 1.3815 ft² - useful for stand density and carbon calculations.

Next stepUse DBH together with tree height to estimate total timber volume or carbon storage with a local species-specific volume table.

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