What you burn
Direct emissions from sources you own or control: fuels and refrigerant leakage.
Typical lines: natural gas, heating oil, LPG, company-owned vehicles, refrigerant top-ups.
Beta — work in progress
CO₂ screening calculator
Estimate emissions using the GHG Protocol’s scope structure. Your data stays in this browser.
- Private by designNo account, no upload. Your figures stay on this device.
- Every factor shownThe full emission-factor table and its sources are on this page.
- ExportableDownload a CSV of every line, or print the summary to PDF.
The basics
Scope 1, 2 and 3 — in plain language
The GHG Protocol splits a company's emissions into three buckets. The split isn't about how big the emissions are — it's about who controls the source.
What you buy as energy
Indirect emissions from purchased energy. This calculator uses location-based grid electricity.
Typical lines: purchased electricity, district heating and cooling.
Everything else in your value chain
Other indirect emissions across 15 value-chain categories. This tool estimates selected activities only.
Typical lines: business travel, commuting, waste, water, purchased goods and services.
Coverage is partial: common fuels and refrigerants, purchased electricity and heat, and selected Scope 3 activities. Process emissions, most value-chain categories and market-based Scope 2 are not calculated.
The calculator
Build your screening inventory
Fill in what you have and leave the rest blank — a partial answer is still a useful one. Everything updates as you type, and your entries are saved in this browser so you can come back to them.
Method
Method & sources
Activity data × emission factor = kgCO₂e. Factors and coverage are visible below.
Accounting basis
Uses the GHG Protocol Corporate Standard scope definitions and selected Scope 3 calculation methods. A complete compliant inventory requires more boundaries, categories and disclosures.
Scope 2
Location-based electricity only. Where required, a separate market-based result must follow the Scope 2 Guidance quality criteria. This tool does not provide that result.
Emission factors
Built-in factors are verified against DESNZ 2026. Most are UK-specific; hotel stays use France. Grid and spend inputs require a published source. Flight factors exclude non-CO₂ radiative forcing.
Where GRI fits
GRI guides sustainability disclosure. It is not an emission-factor database, and this calculator is not a GRI report or a certified inventory.
Every factor used on this page open the full table
| Scope | Activity | Factor | Per unit | Source |
|---|---|---|---|---|
| Enable JavaScript to see the factor table. | ||||
Factor library · DESNZ 2026 Verified against the July 2026 revised flat file (v1.2). Choose factors appropriate to the reporting year, geography and activity.
- DESNZ 2026 — verified factor library
- GHG Protocol — Scope 2 Guidance
- GRI — sustainability reporting standards
- UK Government GHG conversion factors for company reporting (DESNZ / Defra)
- GHG Protocol — Corporate Accounting and Reporting Standard
- GHG Protocol — Corporate Value Chain (Scope 3) Standard
- ADEME — Base Empreinte® (French emission factor database)
- IPCC AR5 — global warming potentials for refrigerants
Screening only. A partial estimate, not verified emissions data. Blank activities are excluded, not confirmed zero. Review boundaries, coverage and factors before external reporting.
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