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Calcimator

Stocking Rate Calculator

Determine optimal animal units per acre based on forage production, grazing period, and animal unit weight. Prevent overgrazing and maximize pasture utilization.

Inputs

lbs/acre
days
lbs

Results

Animal Units per Acre

0.43

Acres per Animal Unit2.3 acres
Animal Units per 100 Acres42.7
AUM per Acre2.56
Usable Forage2,000 lbs/acre
Daily Consumption per AU26 lbs
Total Forage per AU4,680 lbs
How to Use This Calculator
  1. Enter the total pasture area in acres.
  2. Set the forage production in pounds of dry matter per acre per year.
  3. Input the utilization rate (%) — typically 25-50% to maintain pasture health.
  4. Enter the AUM requirement per head for your livestock class.
  5. Review the sustainable stocking rate (AUM/acre) and maximum animal count for your acreage.

How the result changes with Forage Production

Forage ProductionAnimal Units per Acre
1,5900.17
5,3150.57
9,7851.05
13,5101.44

What each input means

Forage Production
Estimated annual dry matter forage production per acre in pounds.
Grazing Days
Number of days animals will graze on the pasture.
Animal Unit Weight
Average weight of one animal unit (standard = 1,000 lb cow with calf).
Utilization Rate
Percentage of total forage that can be safely grazed (typically 40-60%).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Forage Production = 4000, Grazing Days = 180, Animal Unit Weight = 1000, Utilization Rate = 50 = 4 input(s) provided
  2. Calculate Animal Units per Acre
    Animal Units per Acre
    0.43 = 0.43
  3. Calculate Acres per Animal Unit
    Acres per Animal Unit = round((1 / max(auPerAcre
    2.3 = 2.3
  4. Calculate Animal Units per 100 Acres
    Animal Units per 100 Acres
    42.7 = 42.7

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