GHG accounting software for greenhouse gas accounting and GHG inventories

Last updated July 2026. Greenhouse gas accounting and carbon accounting describe the same discipline, and practitioners tend to say GHG accounting because a corporate inventory covers seven gases, not just carbon dioxide. What makes it accounting rather than estimation is the same thing that makes financial accounting work: a fixed boundary, a consistent period, a documented method, and a trail from every reported total back to a source record. Our carbon accounting software starts from the ledger you already keep, classifies each line to a scope and category, and keeps the link to the underlying invoice, so the inventory is reproducible rather than remembered.

GHG accounting is the process of measuring, recording and reporting the greenhouse gases a company emits or causes to be emitted, expressed in metric tonnes of carbon dioxide equivalent (CO2e), over a defined reporting period and within a defined organizational boundary. It follows the GHG Protocol Corporate Standard, which is the framework nearly every disclosure regime and questionnaire builds on. The seven gases covered are carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, sulphur hexafluoride and nitrogen trifluoride, each converted to CO2e using a global warming potential value. That conversion is why a single headline number can represent very different physical emissions, and why stating your GWP version matters.

Yes, in practice the two terms are used interchangeably for the same work. GHG accounting is the more technically precise label, because a corporate inventory covers all seven Kyoto gases rather than carbon dioxide alone, and it is the wording you will see in the GHG Protocol, in assurance standards and in sustainability job descriptions. Carbon accounting is the more common commercial term and the one most software is sold under. There is no methodological difference between them: both mean building a Scope 1, 2 and 3 inventory to the GHG Protocol. If you want the concept from first principles, see what is carbon accounting.

Scope 1 is direct emissions from sources you own or control: fuel burned in boilers, furnaces and company vehicles, plus fugitive releases such as refrigerant leakage. Scope 2 is indirect emissions from the energy you purchase, chiefly electricity, and it must be reported twice, once on grid average factors and once on your actual contracts and certificates. Scope 3 is everything else in your value chain across fifteen defined categories, from purchased goods and services through business travel to the use of sold products, and for most companies it is 70% to 90% of the total. The split is covered in full on Scope 1, 2 and 3 emissions, with the category list on Scope 3 categories.

Step four is the one that changes the schedule, because it converts an open-ended supplier data project into a bounded classification job. The mechanics are in calculating Scope 3 from spend, the tradeoff is covered in spend-based vs activity-based emissions, and the full sequence with checkpoints is the GHG inventory checklist. For the boundary decision specifically, see operational vs financial control.

The category runs from spreadsheets and consultant models at one end to enterprise sustainability suites at the other, and the honest answer is that a lot of companies still run their first inventory in Excel. That works until someone asks you to reproduce a figure. The middle of the market is dedicated GHG accounting platforms, which differ mainly in where they start: some assume you will connect meters and supplier systems and configure a data model first, others start from financial records you already have. We sit in the second group deliberately, because the accounts payable ledger is the one complete record of what a company bought, and Scope 3 is fundamentally a question about what you bought. Compare the field on best carbon accounting software and carbon accounting platforms.

An assurance provider samples. They pick reported figures, ask for the calculation behind each one, and follow it to a source document such as an invoice, a meter reading or a contract. They test whether your stated method matches what you actually did, whether the boundary was applied consistently, and whether restatements were disclosed. Limited assurance asks whether anything suggests the number is materially wrong; reasonable assurance is a positive opinion that it is right, and costs considerably more. The practical implication is that evidence has to be attached to figures as they are produced, not reconstructed afterwards. The difference between the two levels is covered in limited vs reasonable assurance.

Three triggers cover almost everyone. Statute is the hardest: California SB 253 requires companies over $1 billion in revenue doing business in the state to report Scope 1 and 2, with the first deadline on November 10, 2026 and Scope 3 following in 2027. Commercial pressure is the most common: a large customer or an investor asks you to complete a questionnaire, usually CDP, and non-response is recorded. Capital and procurement requirements are the third, where a lender, an insurer or a bid process wants a number before proceeding. All three want the same underlying inventory, which is the argument for building it once properly. See SB 253 reporting software, CDP reporting software and climate disclosure software for each path, and carbon reporting software for the reporting layer on top.