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Calcimator

Tree Stand Density

Calculate basal area, trees per acre, stand density index, and stocking level from average DBH, tree count, and plot size.

Inputs

inches
acres

Results

Trees Per Acre

200 TPA

Basal Area Per Acre

157.1 ft²/acre

Basal Area Per Tree0.79 ft²
Stand Density Index268
Crown Competition Factor117%
Average Tree Spacing14.8 ft
Stocking Percentage175%
Stocking LevelOverstocked
How to Use This Calculator
  1. Enter the Average DBH in inches, the Tree Count from your sample plot, and the Plot Size in acres.
  2. Review Trees Per Acre and Basal Area Per Acre as the primary stocking indicators.
  3. Check Stand Density Index (SDI) and Stocking Percentage to assess crowding relative to maximum density.
  4. Use Crown Competition Factor (CCF) to determine if the stand needs thinning to reduce competition.
  5. Review Average Tree Spacing to plan silvicultural treatments and access for equipment.

How the result changes with Tree Count

Tree CountTrees Per AcreBasal Area Per Acre
1,0011,001 TPA786.2 ft²/acre
3,5013,501 TPA2,749.7 ft²/acre
6,5006,500 TPA5,105.1 ft²/acre
9,0009,000 TPA7,068.6 ft²/acre

What each input means

Average DBH
Average diameter at breast height (4.5 feet above ground) in inches.
Tree Count
Total number of trees counted in the sample plot.
Plot Size
Size of the sample plot or stand area in acres.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Average DBH = 12, Tree Count = 200, Plot Size = 1 = 3 input(s) provided
  2. Calculate Trees Per Acre
    Trees Per Acre
    200 = 200
  3. Calculate Basal Area Per Acre
    Basal Area Per Acre
    157.1 = 157.1
  4. Calculate Basal Area Per Tree
    Basal Area Per Tree
    0.79 = 0.79
  5. Calculate Stand Density Index
    Stand Density Index
    268 = 268

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