High-precision carbon and environmental calculators for sustainability officers, engineers, and compliance teams — every result traceable to a published factor and a named standard.
greencalculus.com · Methodology · Standards · Live demos
Most carbon calculators hardcode a number and ask you to trust it. We don't. Every figure we publish resolves to a versioned emission factor with a named source and a citable standard — so a sustainability lead can hand the output to an auditor, and the auditor can follow it all the way back to the methodology. Verifiability is the product.
| Layer | What it is | Aligned to |
|---|---|---|
| Calculators | Scope 1, 2 & 3 emissions tools across fuels, energy, value chain, finance, and land | GHG Protocol Corporate Standard + Scope 3 |
| Data layer | A single versioned source of truth for every emission factor — see below | IPCC AR6 GWP-100 · DESNZ 2024 · DEFRA 2025 · US EPA · Eurostat |
| Methodology | Formal documentation of how each calculation works | GHG Protocol · IPCC AR6 · PCAF |
| Standards | Citable reference pages mapping each tool to the standard it implements | CSRD/ESRS E1 · SBTi · ISO 14064-1 · LSR (2026) |
Organised as families, not one-offs — each family folds regional and per-asset variants into a single tool:
- Scope 1 — stationary & mobile combustion, refrigerants, process emissions
- Scope 2 — location- & market-based electricity, steam, heat, cooling
- Scope 3 — spend-based (MRIO/EEIO), category 1–15, transport & distribution
- Financed emissions (PCAF) — all 7 Part A asset classes, plus facilitated, insurance-associated, and data-quality scoring
- Land sector (FLAG) — land-use change, land management, and carbon removals as separate lines
- Target setting (SBTi) — near-term Absolute Contraction trajectories and net-zero pathways
Every calculator reads from a single, versioned, date-anchored factor store rather than scattered hardcoded constants. It holds thousands of emission factors and GWP values across fuels, electricity grids, spend-based EEIO sectors, and AFOLU — each tagged with its source, year, and GWP basis.
- Versioned — factor sets are date-stamped (e.g.
v2025.x); a value change is a tracked, auditable event - Validated — automated parity checks gate every change, so no calculator silently drifts from the canonical value
- Single-sourced — the same factor feeds the on-site calculator and the underlying API, so the math can never disagree with itself
- Fail-soft — an unrecognised key degrades visibly, never to a wrong-but-plausible number
This is the difference between a calculator site and a carbon-accounting reference layer.
| Repository | What you'll find |
|---|---|
| 🌐 greencalculus-calculator-demo | Open-source, zero-dependency demos — Scope 1 combustion, SBTi targets, FLAG, PCAF financed emissions |
| 📐 greencalculus-methodology | Formal methodology, emission-factor datasets, and GHG Protocol alignment documentation |
| 📖 greencalculus-standards | Open mapping to the global standards we implement — GHG Protocol, Scope 3, LSR 2026, IPCC AR6, ISO 14064-1, CSRD/ESRS E1, SBTi, DEFRA |
- Zero-dependency Vanilla JS — no jQuery, no Bootstrap, no build step for the public tools
- CSS
@layerarchitecture with fluidclamp()typography andtabular-numsprecision rendering WebApplicationJSON-LD schema on every calculator for machine-readable provenance- Disciplined versioning — semantic plugin versions and date-anchored factor versions, every value change logged in a public changelog
GreenCalculus (2026). [Calculator or methodology title]. Version [x]. GreenCalculus.com.
https://greencalculus.com/...(accessed YYYY-MM-DD).
Each calculator and methodology page carries its own version and last-reviewed date for precise citation.
Built and maintained by Jeremiah Say — Lead Systems Architect
GHG Protocol · IPCC AR6 · CSRD/ESRS E1 · SBTi · PCAF