Oil & Gas Methane Emission Factors

33 emission factors held in the GreenCalculus MasterBrain, drawn from IPCC 2019 Refinement to the 2006 IPCC Guidelines Vol 2 Ch 4. Values are read live from the data layer on every page build, so nothing here is re-typed and nothing can drift from the figures the calculators use. They span 16 units of measurement — 6 of them in tonnes CH4 per million m3 gas consumption — which is why the spread below is reported per unit and never blended. The count includes 4 fugitive coal-mine methane factors, a family too small to warrant a page of its own and published nowhere else.

Where these factors are used

Oil and Gas Methane sets out how factors in this group are applied, and Oil & Gas Methane Calculator draws on them directly. Each value below names the upstream source it came from.

What this group contains

Figures are computed per unit and never blended: a median across different units would be arithmetically valid and physically meaningless. 15 further units in this group have fewer than 3 factors and are counted above but not described.

What has changed

Sources, citation & machine access

Cite the upstream publisher for the values themselves. The reference below credits this compilation and, more usefully, pins the edition you read.

Say, Jeremiah (2026). Oil & Gas Methane Emission Factors (MasterBrain v2026.110). GreenCalculus. https://greencalculus.com/factors/oil-gas-methane-factors/

Cite this factor group

Values change between editions. Quoting the MasterBrain version is what lets a reader resolve the exact number you used — see the change record above for factors in this group that have moved.

For a reference manager — BibTeX, then RIS:

@misc{greencalculus_oil_gas_2026,
  author       = {Say, Jeremiah},
  title        = {Oil & Gas Methane Emission Factors},
  year         = {2026},
  howpublished = {GreenCalculus},
  note         = {MasterBrain v2026.110},
  url          = {https://greencalculus.com/factors/oil-gas-methane-factors/}
}

TY  - DATA
AU  - Say, Jeremiah
TI  - Oil & Gas Methane Emission Factors
PY  - 2026
PB  - GreenCalculus
ET  - MasterBrain v2026.110
UR  - https://greencalculus.com/factors/oil-gas-methane-factors/
ER  - 

Every factor on this page is readable from the open endpoint. No key, no signup:

https://greencalculus.com/wp-json/greencalculus/v1/factors/oil_gas

curl -s "https://greencalculus.com/wp-json/greencalculus/v1/factors/oil_gas?limit=500"

import requests
rows = requests.get("https://greencalculus.com/wp-json/greencalculus/v1/factors/oil_gas", params={"limit": 500}).json()["factors"]
print(len(rows), "factors in oil_gas")

Or the same rows as a spreadsheet — every factor with its source, the edition it last changed in, and its own link:

https://greencalculus.com/wp-json/greencalculus/v1/factors-export?page=oil-gas-methane-factors

Download this table as CSV

Both responses carry an X-GC-Version header, so a consumer can detect a new edition without diffing the payload. The CSV filename carries the edition too, so two downloads months apart do not collide.

All factors

Last changed names the data-layer edition in which a factor last took a new value, reconstructed from every released edition since v2025.13. A dash means the value has not moved since tracking began — which is the answer to "is the figure I used last year still current?".

Common questions