Carbon Price Reference Values

88 carbon price reference values held in the GreenCalculus MasterBrain, drawn from 1 named source, listed with its publisher and licence under Sources below. 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 2 units of measurement — 87 of them in USD/tCO2e — which is why the spread below is reported per unit and never blended.

Where these factors are used

Carbon Tax Liability and Internal Carbon Pricing set out how factors in this group are applied, and Carbon Tax & ETS Liability Calculator and Internal Carbon Price & Shadow Price Calculator draw 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.

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.

GreenCalculus. (2026). Carbon Price Reference Values (MasterBrain v2026.284). Numbers Publishing Pte. Ltd. https://greencalculus.com/factors/carbon-price-reference-values/

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, in BibTeX then RIS:

@misc{greencalculus_carbon_pricing_2026,
  author       = {{GreenCalculus}},
  title        = {Carbon Price Reference Values},
  year         = {2026},
  howpublished = {GreenCalculus},
  publisher    = {Numbers Publishing Pte. Ltd.},
  note         = {MasterBrain v2026.284},
  url          = {https://greencalculus.com/factors/carbon-price-reference-values/}
}

TY  - DATA
AU  - GreenCalculus
TI  - Carbon Price Reference Values
PY  - 2026
DB  - GreenCalculus
PB  - Numbers Publishing Pte. Ltd.
ET  - MasterBrain v2026.284
UR  - https://greencalculus.com/factors/carbon-price-reference-values/
ER  - 

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

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

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

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

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

https://greencalculus.com/wp-json/greencalculus/v1/factors-export?page=carbon-price-reference-values

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