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Calcimator

Silvopasture Design Calculator

Design silvopasture systems by calculating tree density, canopy coverage, forage impact, livestock heat stress benefits, and establishment costs.

Inputs

%

Results

Total trees to plant

2,000

Mature canopy coverage (%)64.9
Max trees/acre for target canopy24.6
Forage yield reduction (%)51.9
Livestock weight gain improvement (%)5
Annual CO2e sequestered (tons)115
Total establishment cost ($)$36,000.00
Establishment cost/acre ($)$720.00
Forage Quality Increase (%)30%
How to Use This Calculator
  1. Enter Pasture size (acres), Trees per acre, and Mature crown diameter (ft).
  2. Set Target canopy coverage (%), Tree cost ($), and Herd size (AU).
  3. Adjust Avg summer high (F) as needed.
  4. Review the Total trees to plant result.
  5. Use Mature canopy coverage (%) and Max trees/acre for target canopy to inform your decision.

How the result changes with Pasture size (acres)

Pasture size (acres)Total trees to plant
10,001400,040
35,0011,400,040
65,0002,600,000
90,0003,600,000

What each input means

Pasture size (acres)
Total pasture acreage for silvopasture conversion.
Trees per acre
Planned tree density. Typical: 30-60 for timber, 60-100 for fruit/nut.
Mature crown diameter (ft)
Expected canopy spread at maturity. Oaks: 30-50 ft, fruit trees: 15-25 ft.
Target canopy coverage (%)
Desired canopy coverage. Keep below 50% for grass persistence. 30-40% is ideal.
Tree cost ($)
Cost per seedling or transplant.
Herd size (AU)
Animal Units on the pasture. 1 AU = 1,000 lb animal.
Avg summer high (F)
Average summer high temperature. Heat stress begins above 80F for cattle.

What each result means

Total trees to plant
Total number of trees for the entire pasture.
Mature canopy coverage (%)
Projected canopy coverage at tree maturity. Target 30-40% for best forage balance.
Max trees/acre for target canopy
Maximum tree density to stay within your target canopy percentage.
Forage yield reduction (%)
Estimated grass forage reduction from shading. Offset by improved forage quality.
Livestock weight gain improvement (%)
Estimated improvement in daily weight gain from heat stress reduction.
Annual CO2e sequestered (tons)
Combined carbon sequestration from trees and improved pasture.
Total establishment cost ($)
Trees, protection (tubes/cages), and planting labor.
Establishment cost/acre ($)
Per-acre cost including trees, protection, and planting.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Pasture size (acres) = 50, Trees per acre = 40, Mature crown diameter (ft) = 30, Target canopy coverage (%) = 40 = 7 input(s) provided
  2. Calculate Total trees to plant
    Total trees to plant = round(treesPerAcre * pastureAcres)
    2000 = 2000
  3. Calculate Mature canopy coverage
    Mature canopy coverage = (totalCanopySqFt / pastureAreaSqFt) * 100
    64.9 = 64.9
  4. Calculate Max trees/acre for target canopy
    Max trees/acre for target canopy = (targetCanopyPct / 100 * 43560) / crownAreaSqFt
    24.6 = 24.6

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