Provider directory

You have the number. Now find someone who can stand behind it.

A short, reviewed list of carbon consultants, verifiers and software — each one with the standards it works to, and our reason for listing it.

Chosen by us. Nobody can pay their way onto the curated list; sponsored listings sit in their own labelled section and are never mixed into it.

Run a consultancy, verification body or software product? List your business — US$390 a year →

Browse

What do you need done?

Categories are the job, not the jargon — pick the one that matches the problem in front of you.

Assurance & verificationIndependent bodies and practitioners who verify a greenhouse-gas inventory or report against a standard such as ISO 14064-3 — the people you go to once a number has to survive scrutiny.Bureau Veritas UK, First Environment, LRQA and 1 more4 listedCarbon accounting & inventoryConsultants who build and maintain a corporate greenhouse-gas inventory across Scopes 1, 2 and 3, from a first footprint through to the annual reporting cycle.Anthesis Group, The Carbon Trust, Pangolin Associates and 3 more6 listedCarbon softwarePlatforms and tools for collecting activity data, calculating emissions and producing disclosures — listed as software, not as consultancy.Terrascope, Preoptima, One Click LCA3 listedEmbodied carbon & LCAPractitioners producing life-cycle assessments, EPDs and whole-life carbon assessments for products and buildings, to EN 15978, EN 15804 or ISO 14040/44.thinkstep-anz, Enviropass Consulting, Circular Ecology and 1 more4 listedFinanced emissionsSpecialists in measuring the emissions attributable to loans and investments under the PCAF standard, for banks, asset managers and insurers.Persefoni, Guidehouse, SE Advisory Services3 listedRegulatory reportingAdvisers on mandatory disclosure and border-carbon regimes — CSRD and ESRS E1, CBAM, UK SECR and the Californian climate-disclosure rules.Bureau Veritas UK, SCS Consulting Services, ESG PRO and 1 more4 listed

Everyone listed

23 providers, A–Z

The whole directory on one screen. Every entry below was chosen and written by us — open one to see the standards it works to and why it is here.

How we chose them

The same test we apply to a number.

Every provider here names the standard it works to — ISO 14064, PCAF, EN 15978, the GHG Protocol — publicly, on its own site, before anyone asked. That is the whole test.

It is the one we apply to an emission factor: a number you cannot trace to a source is not a number you can defend, and a method described as proprietary is a method nobody can check. A firm that tells you which rules it followed is one whose work survives a question. A firm that describes its approach without naming a standard may be excellent — and you will have no way to tell.

Two things follow, and they are worth knowing before you appoint anyone:

  • An accreditation is a claim until you check the number against the register.
  • The firm that helped write a report should not be the firm that assures it.

Use it on providers who are not on this list too. If it only works here, it was never guidance.

Or tell us the job

Want a shortlist instead?

If you’d rather not read every profile: say what needs doing and where you are, and we send back the two or three names here that fit. Answers come from the curated list only — a paid listing never buys a place in an answer.

Several providers only work in one region, so this is what narrows the list.

The shortlist goes here. We do not keep it.

Forwarded to jeremiah@greencalculus.com and discarded — no list, no marketing. Shortlists are pointers, not endorsements: the same checks in “how we chose them” apply, and the appointment is yours to make.

For providers

Why pay to be here

Not traffic. Timing. Everyone reading this page arrived from a calculation they just finished.

The moment, not the impression

These are people who have a number in front of them and a decision to make about it — not someone three pages into a search.

A short list, not a database

Sponsored listings never outnumber the curated ones in a category, so the page is never mostly advertising — and you are one of a handful, not one of four hundred.

You will know if it worked

We count the enquiries your profile sends you — each one bot-checked — and the clicks through to your site. Renew on evidence, not on faith.

How it works

  1. Pay by card — US$390 a year or US$39 a month, through Stripe.
  2. Fill in your profile — the form opens the moment you pay, and we email you a link to it as well. Ten minutes.
  3. We review and publish — usually within a working day. Cancel any time; the listing runs to the end of the period you paid for.

Before you buy

Questions people actually ask

How many people will see it?

We have counted since 10 August 2026 — an impression each time a card is actually scrolled into view, and a click each time someone acts on one. Two numbers, not one: they answer different questions, and averaging them would hide the more interesting half.

We are still not going to print a figure here. It would be a few weeks of a young programme, and a number on a sales page gets read as a promise about next month. Ask us for the category you are interested in and we will send you what the counter says, including when that is “not many yet”.

The audience is not in doubt: 142 calculators, 158 methodologies and 132 standards pages, read by people doing carbon accounting rather than reading about it.

Do I get a backlink?

No. Every outbound link from the directory carries rel="sponsored", which passes traffic but not search ranking. Selling followed links breaks Google’s guidelines and puts the whole site at risk, so we will not do it at any price. What you are buying is the placement, the profile and the traffic.

Can I cancel?

Any time, from the card you paid with. The listing runs to the end of the period you paid for and then comes down on its own. No notice period and nothing to email us about.

Who decides who gets listed?

We do. Paying puts a listing in the sponsored section above the curated one — it does not change whether it qualifies, and it never changes who we chose for the curated list. Every listing is reviewed before it goes live, and we will refund rather than publish something we would not stand behind.

How quickly is it live?

You fill in your own profile straight after paying, which takes about ten minutes. We review it, usually within a working day.

Listings are selected by us and are not recommendations, endorsements or an assurance of quality. We do not verify providers’ claims. Nothing here influences our emission factors, methodology or calculator results.

Scroll to Top