This page is designed to help you find out whether GreenCalculus is good and if it is the right choice for you.
An emission-factor API for developers who need carbon numbers they can defend. Skip building your own factor database: one API returns sourced factors and audit-traced calculations, every value tied to its exact source.
'UK electricity'!E25), data version, and a public verification URL your auditor can open without an account.pip install greencalculus / npm i greencalculus), REST API and LangChain integration.Run real, sourced calls in the browser playground with no key. Keyless lookups also work from the SDK.
Free: 1,000 calls/month, no card. Then US$49/month. Public open-source projects get 10× the free quota.
Developers adding carbon accounting to SaaS, fintech, logistics or procurement products; teams building AI agents that must cite numbers; analysts who've outgrown copying DEFRA tables into spreadsheets.
An honest comparison with Climatiq and a list of data not yet covered are published so you can check fit before integrating.
Listed in
Emission factors
20,764 sourced factors across 151 countries
Calculation engines
7: Scope 1/2/3, PCAF, embodied (EN 15978), freight, spend, travel
Source traceability
Every value returns its source cell, licence and data version
Version pinning
?as_of= reproduces past results exactly
Calculation receipts
SHA-256 receipt hash on every result
MCP server
12 tools for Claude and any MCP client
SDKs
Python, Node.js, LangChain
Free Tier
1,000 calls/month, no card required
Every number comes with its proof. Each emission factor the API returns names the exact source cell it was read from (e.g. DEFRA 2026, 'UK electricity'!E25), its licence and the data version, plus a public verification page anyone can open without an account. Results are version-pinned and carry a receipt hash, so last year's figure reproduces exactly even after a publisher revises the number.
Choose it if you need numbers you can defend. Calculations are open on every plan, including the free one, and you pay for volume and redistribution rights, never for access. It's built for AI agents (an MCP server with 12 tools, plus LangChain), and you can test it live with no signup. We also publish what we don't hold yet and an honest comparison with Climatiq, which has a larger dataset. If breadth matters more to you than traceability, that comparison tells you so.
Developers and product teams building carbon accounting, ESG/CSRD reporting, procurement and spend analysis, or travel and logistics software, and teams building AI agents that must cite their numbers instead of guessing.
GreenCalculus started in Singapore in 2025 as a set of carbon calculators. Most online carbon calculators failed three basic tests: they cited no emission-factor source, used outdated GWP values, and gave totals no one could trace back to a formula. We built tools that could survive a methodology review. Then we noticed that software teams were all rebuilding the same factor layer themselves and re-maintaining it every year as publishers revised their numbers. So the calculators became infrastructure: one API, every value sourced.
Cloudflare Workers at the edge for the REST API and MCP server, PHP/WordPress for the public reference site, and Python and Node.js SDKs. Three open datasets are deposited on Zenodo with permanent DOIs.
We have collected here some useful links to help you find out if GreenCalculus is good.
Check the traffic stats of GreenCalculus on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of GreenCalculus on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of GreenCalculus's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of GreenCalculus on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about GreenCalculus on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is GreenCalculus good? This is an informative page that will help you find out. Moreover, you can review and discuss GreenCalculus here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
