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GreenCalculus icon

GreenCalculus

Free, methodology-transparent carbon & GHG emissions calculators — Scope 1, 2 & 3, embodied carbon, and financed emissions, built on auditable DEFRA, IPCC & grid emission factors.

GreenCalculus.com Homepage

Cost / License

  • Free
  • Open Source (MIT)

Platforms

  • Online  Web-based application — runs in any modern browser (Chrome, Firefox, Safari, Edge). No installation, signup, or download required; works on desktop, tablet, and mobile.
Calculator Example: Bitcoin Emissions Calculator — Cambridge CBECI & Digiconomist, with Uncertainty Bands
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GitHub repository

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  •  10 Forks
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What is GreenCalculus?

GreenCalculus is a free suite of online carbon footprint and greenhouse gas (GHG) emissions calculators for sustainability professionals, ESG analysts, engineers, and businesses preparing climate disclosures.

Unlike black-box carbon tools, every GreenCalculus calculator shows its methodology, formulas, and the exact emission factors used — each one cited to a primary source (DEFRA, IPCC, EPA, IEA/Ember, AIB, PCAF, ÖKOBAUDAT) and versioned so your numbers are auditable and disclosure-ready.

What you can calculate:

  • Scope 1, 2 & 3 emissions — fuel combustion, purchased electricity (location- & market-based), purchased steam & hot water, residual mix, and value-chain categories.
  • Financed emissions (PCAF) — a full suite of financed-emissions and spend-based calculators with automatic data-quality scoring.
  • Embodied & whole-life carbon (EN 15978 / EN 15804) — concrete, masonry, timber, bio-materials, plastics & packaging, with cradle-to-grave life-cycle stages.
  • AFOLU & agriculture — land-use change, rice cultivation methane, manure management, biomass & biofuels, coal-mine methane.
  • Product & sector PCF / LCA — product carbon footprints built up from underlying activity data.
  • Digital & ICT emissions — data-centre, cloud region, streaming, and end-user-device footprints.

Why people choose GreenCalculus:

  • 100% free and browser-based — no signup, no paywall, no installation.
  • Transparent methodology on every page — see exactly how each result is derived.
  • Citable, versioned emission factors — perfect for CSRD, GHG Protocol, SECR, and CDP reporting.
  • Built on official datasets: DEFRA 2026, IPCC, EPA, IEA/Ember grid factors, PCAF, AIB residual mix.
  • Constantly expanding library of specialized, sector-specific tools.