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Calcimator

Livestock Methane Monitoring Calculator

Estimate enteric methane emissions, manure production rates, barn ventilation requirements, and carbon credit potential for livestock operations.

Inputs

$

Results

Total CO2e (tonnes/year)

137.9

Methane per head (kg CH4/yr)49.3
Total methane (kg CH4/yr)4,927
Carbon credit value$4,138.00
Manure per head (lbs/day)102
Annual manure (tons)1,862
Mild-weather ventilation (cfm)5,000
Hot-weather ventilation (cfm)15,000
Co2e Per Head Kg1,379.45
Total N18,615
Total P5,584.5
Total K14,892
Total Barn (sq ft)5,000
How to Use This Calculator
  1. Enter Number of head, Average weight (lbs), and Animal type (0=Beef, 1=Dairy, 2=Swine, 3=Poultry, 4=Sheep).
  2. Set Days in operation, Barn space per head (sq ft), and Carbon credit price ($/tonne CO2e).
  3. Review the Total CO2e (tonnes/year) result.
  4. Use Methane per head (kg CH4/yr) and Total methane (kg CH4/yr) to inform your decision.

How the result changes with Number of head

Number of headTotal CO2e (tonnes/year)
100,001137,946.2
350,001482,808.3
650,000896,641.4
900,0001,241,503.5

What each input means

Number of head
Total animals in the operation.
Average weight (lbs)
Average body weight per animal.
Animal type (0=Beef, 1=Dairy, 2=Swine, 3=Poultry, 4=Sheep)
0=Beef cattle, 1=Dairy cow, 2=Swine, 3=Poultry (broiler), 4=Sheep.
Days in operation
Days per year animals are housed/managed.
Barn space per head (sq ft)
Barn floor area allocated per animal (0 if pasture-only).
Carbon credit price ($/tonne CO2e)
Market price per tonne of CO2 equivalent offset.

What each result means

Total CO2e (tonnes/year)
Total greenhouse gas emissions in CO2 equivalent tonnes.
Methane per head (kg CH4/yr)
Enteric methane emission per animal per year.
Total methane (kg CH4/yr)
Total enteric methane from the herd.
Carbon credit value
Potential value if emissions were offset.
Manure per head (lbs/day)
Daily manure production per animal.
Annual manure (tons)
Total annual manure production.
Mild-weather ventilation (cfm)
Required airflow in mild temperatures.
Hot-weather ventilation (cfm)
Required airflow in hot temperatures.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Number of head = 100, Average weight (lbs) = 1200, Animal type (0=Beef, 1=Dairy, 2=Swine, 3=Poultry, 4=Sheep) = 0, Days in operation = 365 = 6 input(s) provided
  2. Calculate Total CO2e
    Total CO2e = (totalMethaneKg * 28) / 1000
    137.9 = 137.9
  3. Calculate Methane per head
    Methane per head = species.factor * pow(weightScaler, 0.75)
    49.3 = 49.3
  4. Calculate Total methane
    Total methane = methanePerHeadKg * numHead * (daysPerYear / 365)
    4927 = 4927

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