Carbon numbers you can trace to the row they came from.
LCALens calculates Scope 1, 2 and 3 emissions with official factors that a person has checked against the publisher's file. Every result keeps the file, sheet, row and checksum behind it.
6,000
litres of diesel
2.58354
kg CO₂e per litre
15,501
kg CO₂e
Activity data
From a fuel card export for the year. The unit, litres, matches the factor's unit.
Factor
UK government conversion factors 2026, version 1.2 (revised July 2026), diesel with average biofuel blend, sheet "Factors by Category", row 187. Checked by a reviewer; file checksum a9a455ab396d….
Result
Saved with the inputs, factor version and code version. Once locked, it never changes.
Free tools, no account needed
- 21CalculatorsFuels, vehicles, refrigerants, electricity in the UK and Italy, heat, travel, commuting, freight, waste, water and spend-based purchases, each showing the factor and its source row, plus a science-based target checker.
- 410ConvertersAny greenhouse gas or refrigerant to CO₂e with AR4, AR5 and AR6 values, plus energy and mass units from NIST definitions.
- 33GuidesScopes 1, 2 and 3, all 15 Scope 3 categories, SBTi targets, the GHG Protocol, ISO and ESRS, with every source linked.
Where the numbers come from
Factors enter the library only by reading the publisher's own file. We record its address, version, licence and checksum, and nothing is typed in by hand.
How factors are reviewedGHG Protocol (WRI/WBCSD), compiling IPCC AR4, AR5 and AR6 values
Global Warming Potential Values (August 2024), Version 2.0 (7 Aug 2024)
checksum 5f0bbd46600e…
497 GWP values verified
ISPRA (Istituto Superiore per la Protezione e la Ricerca Ambientale)
Fattori di emissione per la produzione ed il consumo di energia elettrica in Italia, 2026 edition, V2 of 07.07.2026 (1990-2024, preliminary 2025); annex to Rapporto 430/2026
checksum f16e7c3dce20…
108 of 108 factors verified
U.S. EPA Office of Research and Development
Supply Chain Greenhouse Gas Emission Factors by NAICS-6, v1.3.0 (CO2e, 2022 USD, purchaser price)
checksum 6025a14c4fe1…
1,016 of 1,016 factors verified
UK Department for Energy Security and Net Zero (DESNZ)
UK Government GHG Conversion Factors for Company Reporting 2026 (flat file), 1.2 (revised July 2026)
checksum a9a455ab396d…
7,035 of 7,035 factors verified
How a number is built
- 1
Enter what happened
Litres of diesel, kWh of electricity, kilograms of refrigerant topped up. Units are checked against the factor before anything is multiplied.
- 2
A reviewed factor is applied
Only factors a person has checked against the publisher's file can be used. Imported values wait as pending until then.
- 3
The source travels with it
Each result carries the file, sheet, row and SHA-256 checksum of the factor, so anyone can open the original and check.
- 4
Lock it
Saved calculations keep their inputs, factor version and code version. Locked results and approved inventories cannot change.
With an account
Everything a consultancy or sustainability team needs to produce a full inventory and hand it over.
- Inventories
- Scope 1, 2 and 3 by site, entity and year, with location- and market-based Scope 2 side by side and a data checklist for every category.
- Group structures
- Legal entities with ownership shares, totals under operational control, financial control or equity share.
- Bulk imports
- Excel or CSV uploads checked row by row, all or nothing, with a template for every calculator.
- Your own factors
- Supplier and contract factors kept private to your organisation, each with its evidence attached.
- Reports
- A report builder with your own commentary around the figures, plus PDF, Word, PowerPoint and Excel exports with the methodology, every factor's source and the file checksums.
- Product footprints
- Carbon footprint per product by life-cycle stage, plus the other EU Environmental Footprint impact categories where your EPD or supplier data reports them, with coverage shown.
- Supplier portal
- Ask suppliers for product footprints or company emissions through a private link, then review each answer before it is used.
- Brand studio
- Your logo, colours and footer on every PDF you download.
- Team
- Invitations and roles, from viewer to owner, with every change recorded in an audit log.
Not built yet: connections to licensed LCA databases, so impacts beyond climate come only from EPD and supplier data you enter.
Start with one fuel bill.
Free account, no card. Your first result shows its source row.