Tree Diameter Calculator
Calculate tree diameter at breast height (DBH) from circumference measurements
Calculate Tree Diameter
DBH height varies by country. This affects where you measure circumference.
Measure around the trunk at 4.5 ft (1.37 m) above ground
Tree Diameter Results
Diameter Outside Bark (DOB)
Formula used: Diameter = Circumference ÷ π
DBH Height: 4.5 ft (1.37 m) above ground
Diameter Analysis
Example Calculations
Single-Stem Tree Example
Circumference: 75 cm (measured at 1.37m height)
Calculation: Diameter = 75 ÷ π = 75 ÷ 3.14159
Result: Diameter = 23.9 cm
Multi-Stem Tree Example
Stem circumferences: 30cm, 25cm, 20cm
Individual diameters: 9.55cm, 7.96cm, 6.37cm
Calculation: √(9.55² + 7.96² + 6.37²) = √(91.2 + 63.4 + 40.6)
Result: Diameter = √195.2 = 14.0 cm
DBH Measurement Heights
DBH (Diameter at Breast Height) is a standard forestry measurement used globally.
Measurement Tips
Measure on the uphill side for trees on slopes
Use the underside face for leaning trees
Wrap tape tightly around the trunk
For multi-stem trees, measure each stem separately
Trees grow 0.2-0.4 cm in diameter per year
Understanding Tree Diameter Measurement
What is DBH?
DBH (Diameter at Breast Height) is a standard forestry measurement used to determine tree size. It's measured at a specific height above ground level, which varies by country but is typically around 1.3-1.4 meters (4.3-4.6 feet).
Why is DBH Important?
- •Estimates tree volume and biomass
- •Determines tree age and growth rate
- •Calculates carbon storage capacity
- •Assesses forest inventory and value
Calculation Methods
Single Stem
d = C ÷ π
Simple division of circumference by pi
Multi-Stem
d = √(d₁² + d₂² + ... + dₙ²)
Square root of sum of squared individual diameters
Inside Bark
DIB = DOB - (2 × BT)
Outside diameter minus twice the bark thickness