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Calcimator

Forest Growth Projector

Project future timber stand volume using site index and stand age. Calculates mean annual increment, periodic annual increment, and optimal rotation age.

Inputs

MBF
years
years

Results

Projected Volume

106.5 MBF

Volume Growth

56.5 MBF

Growth Percentage113%
Periodic Annual Increment2.83 MBF/yr
Current MAI1.25 MBF/yr
Future MAI1.78 MBF/yr
Optimal Rotation Age106 years
Stand Age at Projection60 years
How to Use This Calculator
  1. Enter the Current Stand Volume in MBF (thousand board feet) and the Current Stand Age in years.
  2. Enter the Site Index reflecting soil quality and growth potential for the species.
  3. Enter your Projection Period in years to forecast volume at a future date.
  4. Review Projected Volume and Volume Growth to plan harvest timing and timber sale revenue.
  5. Check Optimal Rotation Age and Periodic Annual Increment (PAI) to identify the most productive cutting cycle.

How the result changes with Current Stand Volume

Current Stand VolumeProjected VolumeVolume Growth
10,00021,303.4 MBF11,303.4 MBF
35,00074,561.9 MBF39,561.9 MBF
65,000138,472.1 MBF73,472.1 MBF
90,000191,730.6 MBF101,730.6 MBF

What each input means

Current Stand Volume
Current timber volume in thousand board feet (MBF) for the stand.
Site Index
Site index (base age 50) indicating site productivity. Higher = better growing conditions. Typical: 50-80.
Current Stand Age
Current age of the stand in years from establishment.
Projection Period
Number of years into the future to project growth.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Current Stand Volume = 50, Site Index = 65, Current Stand Age = 40, Projection Period = 20 = 4 input(s) provided
  2. Calculate Projected Volume
    Projected Volume
    106.5 = 106.5
  3. Calculate Volume Growth
    Volume Growth
    56.5 = 56.5
  4. Calculate Growth Percentage
    Growth Percentage
    113 = 113
  5. Calculate Periodic Annual Increment
    Periodic Annual Increment
    2.83 = 2.83

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