Farm Emissions Calculator — GXLab

GXLab farm greenhouse gas emissions calculator — DSE-based, Scope 1/2/3, with cropping and soil carbon

Farm Emissions Calculator

Scope 1, 2 & 3 greenhouse gas accounting — DSE-based livestock input — PICCC SB-GAF / G-GAF aligned

Australian NGGI 2024 methods  ·  IPCC AR6 GWP values (CH₄ = 27, N₂O = 273)

Farm profile
1 DSE = 50 kg dry Merino ewe maintaining condition (~1 kg DM/day). Beef cow + calf ≈ 18 DSE.
Scope 1 Livestock emissions
Typical range 55–75%. Higher digestibility → lower methane conversion factor (Ym). Native pasture ≈ 55%, improved pasture ≈ 68–72%.
Scope 1 On-farm energy & soil inputs
Scope 2 Purchased electricity
Deducted from grid consumption before applying state emission factor.
Scope 3 Purchased inputs — embedded emissions
Scope 1 Cropping enterprise — mixed farming

Add each crop. Calculates soil N₂O (direct + indirect), crop residue N₂O, fuel use per ha, urea CO₂, lime CO₂, and embedded fertiliser — consistent with PICCC G-GAF Tier 1 methodology.

Soil carbon SOC change (optional)

Soil organic carbon change can offset or add to farm emissions. Enter a measured or modelled annual change. Positive values = carbon gain (sequestration). Negative values = carbon loss (emission). Use CSIRO LOOC-C or SOCRATES for modelled estimates. This figure does not form part of a formal carbon credit claim.

Area over which SOC change was measured or modelled.
Positive = sequestration. Negative = loss. Typical regenerative gains: 0.1–0.5 t C/ha/yr. Multiply by 3.67 to convert to t CO₂-e.
Sequestration Vegetation carbon offset
Annual emissions estimate
Net total
—
t CO₂-e / yr
Gross emissions
—
t CO₂-e / yr
Per DSE
—
t CO₂-e / DSE
Per hectare
—
t CO₂-e / ha
Tree sequestration
—
t CO₂ / yr
S1 On-farm
—
t CO₂-e
S2 Electricity
—
t CO₂-e
S3 Inputs
—
t CO₂-e
Emissions by source
Methodology: Enteric CH₄ from DSE-based DMI (1 kg DM/DSE/day) × GE content (18.4 MJ/kg DM) × Ym factor adjusted for digestibility. Manure N₂O from NGGI Tier 1 N-excretion rates. Crop N₂O from NGGI Tier 1 soil N emission factors with residue N. Electricity emission factors by state from NGA Factors 2024. Scope 3 from published Australian LCA values. Sequestration rates are indicative (not certified offsets). SOC change is for indicative purposes only and does not constitute a carbon credit or certified carbon account.
References & methodology sources
[1]

Primary Industries Climate Challenges Centre (PICCC) — Sheep & Beef Greenhouse Accounting Framework (SB-GAF). University of Melbourne & Integrity Ag & Environment.

piccc.org.au/resources/Tools.html
Enteric methane, manure N₂O & CH₄, livestock emission structure
[2]

Primary Industries Climate Challenges Centre (PICCC) — Grain Greenhouse Accounting Framework (G-GAF). Cropping enterprise emission methodology.

piccc.org.au/resources/Tools.html
Soil N₂O, crop residue, fuel per ha, embedded fertiliser
[3]

Australian Government DCCEEW — National Greenhouse Accounts (NGA) Factors 2024. Department of Climate Change, Energy, the Environment and Water.

dcceew.gov.au — NGA Factors 2024
State electricity emission factors, fuel combustion, lime/dolomite, GWP100 AR6
[4]

Meat & Livestock Australia (MLA) — Carbon Accounting Technical Manual (V.SCS.0016). PICCC SB-GAF user documentation including DSE conversion factors and indicative emission benchmarks.

mla.com.au — Carbon accounting resources
DSE definitions, N-excretion rates, indicative t CO₂-e per DSE benchmarks
[5]

IPCC — 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Chapter 10 (Livestock). GWP100 AR6 values: CH₄ = 27, N₂O = 273.

ipcc-nggip.iges.or.jp — 2019 Refinement
GWP values, Ym methane conversion factors, Tier 1 / Tier 2 livestock methodology
[6]

Agriculture Victoria — Emission Intensity, Sheep Notes Newsletter, Autumn 2025. Benchmarks for SB-GAF calculated emission intensities for Australian beef and sheep production.

agriculture.vic.gov.au — Emission intensity
Emission intensity benchmarks, DSE-emissions relationship
[7]

CSIRO LOOC-C — Landscape Options and Opportunities for Carbon. Modelling tool for estimating SOC and vegetation carbon change on Australian farms.

csiro.au — Soil carbon research & LOOC-C
Soil organic carbon change estimates
[8]

Queensland University of Technology — SOCRATES (Soil Organic Carbon Reserves and Transformations in Ecosystems). Modelling tool for annual SOC change.

dpi.nsw.gov.au — On-farm GHG tools & calculators
Soil organic carbon modelling
[9]

MLA Carbon Calculator — web-based digitisation of SB-GAF tool. Meat & Livestock Australia, 2023.

mla.com.au — MLA Carbon Calculator
Cross-reference for calculation outputs and benchmarks