Corporate GHG Emissions Screening Calculator
Quantify operational Scope 1 stationary combustion, Scope 1 mobile fleet fuel, Scope 2 location-based purchased electricity, and strictly segregated optional Scope 3 Category 6 business travel using 14 source-verified emission factors across the UK (`GB`), United States (`US`), and United Arab Emirates (`AE` / `AE-DU`).
How to Use This Screening Calculator: Quick-Start vs. Advanced Overrides
Engine v1.1.0 Active • v1.0.0 ReproducibleQuick-Start Mode (One-Click Reference Presets)
Select one of the pre-loaded validation scenarios below (e.g. UK SME Office + Fleet, UAE Commercial Office, or US Facility) to instantly populate verified activity data and inspect real-time emissions calculations without manual entry.
Advanced Mode (Custom Line-Item Factor Overrides)
Switch methodology versions (v1.1.0 vs v1.0.0), toggle optional Scope 3 Category 6 travel, adjust sub-national ISO codes (such as AE-DU for Dubai), or customize individual activity rows with specific fuels and quantities.
SCREENING ESTIMATE ONLY — NOT A COMPLETE CORPORATE GHG INVENTORY. This calculation covers only selected Scope 1 stationary combustion, Scope 1 company-owned vehicle fuel consumption, Scope 2 location-based purchased electricity, and (where enabled) optional Scope 3 Category 6 business travel. It excludes fugitive emissions (refrigerants), process emissions, Scope 2 market-based contractual instrument hierarchy verification, and the remaining 14 Scope 3 categories defined by the WRI/WBCSD GHG Protocol Corporate Value Chain (Scope 3) Standard.
Calculation Boundaries, Factor Years & Geographic Restrictions
Zero Silent Substitution • Audited Factor Register1. Supported Geographies & Factor Years
- UK:
GB — DESNZ 2024 v1.1(Stationary, Mobile Fleet & Location Grid) - US:
US — EPA Hub 2024 / eGRID 2022(Stationary Gas, Fleet Gasoline & National Grid) - Dubai, UAE:
AE-DU — DEWA 2023 in v1.1.0(genericAErejected inv1.1.0to prevent cross-emirate misattribution with Abu Dhabi EWECAE-AZ)
2. Gas Coverage Transparency
- Full Kyoto CO2e (CO2+CH4+N2O): Disaggregated constituent gases converted under IPCC AR5 100-yr GWP (UK DESNZ & US Stationary/Grid).
- CO2-Only Volume Factor (US EPA Table 2 — excludes mileage-based CH4/N2O): US motor gasoline per-gallon factor reports tailpipe CO₂ only; CH₄/N₂O require vehicle-miles traveled (Table 3–5).
- Aggregate Utility CO2e (DEWA): Official Dubai grid factor published as combined
0.4041 kg CO2e/kWhwithout separate CH₄/N₂O split.
3. Scope Exclusions (Partial-Scope Screening Boundary)
Explicitly excluded from this operational screening tool: Fugitive Refrigerants (HFCs), Process Emissions, Purchased Heat/Steam, Market-Based EACs/I-RECs, and Scope 3 Categories 1–5 & 7–15. Optional Scope 3 Category 6 (Business Travel) is strictly segregated from operational Scope 1 + Scope 2 totals.
Quick-Load Deterministic Validation Reference Presets
Load hand-verified benchmark scenarios from GS-VAL-CARB-001 to inspect exact Scope 1, Scope 2, segregated Scope 3 Category 6, or missing-factor rejection behavior across v1.0.0 and v1.1.0.
Deterministic GHG Screening Summary (GB • 2024)
8,773.092 kg CO2e
8.773092 tCO2e (Exact: 8773.092 kg)
9,317.25 kg CO2e
9.317250 tCO2e (Exact: 9317.25 kg)
18,090.342 kg CO2e
18.090342 tCO2e (Exact: 18090.342 kg)
Not Enabled (0.00 kg CO2e)
0.000000 tCO2e
Post-Calculation Actions, Audit Export & Next Steps
Export deterministic line-item results, calculationVersion (v1.1.0), inputHash, runId, and primary factor citations directly in your browser.
Contextual Regulatory & Methodology Guides (GB)
Scope 1+2 OperationalMoving Beyond Partial-Scope Operational Screening
This deterministic calculator covers Scope 1 stationary/mobile combustion, Scope 2 location-based grid electricity, and optional Scope 3 Category 6 travel. When your organization requires full 15-category Scope 3 screening, automated SAP/Oracle/NetSuite ERP & utility ingestion, or ISSA 5000 / CSRD assurance workflows, evaluate verified enterprise software platforms.
- Automated general ledger & procurement ERP connectors
- Market-based Scope 2 contractual instrument (I-REC / GO / REC) retirement tracking
- Multi-entity consolidation with immutable audit logs for external verifiers
Line-Item Breakdown & Greenhouse Gas Constituents (CO₂, CH₄, N₂O)
All constituent gas contributions are expressed in kg CO2e under IPCC AR5 100-year Global Warming Potentials. Factors with CO2_ONLY_EXPLICIT (US EPA Table 2) or AGGREGATE_CO2E_UNSPECIFIED_CH4_N2O are explicitly badged.
| Line ID | Status | Activity & Input | Factor & Gas Coverage | CO₂ (kg) | CH₄ (kg CO₂e) | N₂O (kg CO₂e) | Total CO₂e (kg) | 95% CI Bounds (kg) |
|---|---|---|---|---|---|---|---|---|
| L1 | CALCULATED | natural_gas (GB, 2024) 15,000.00 kWh • scope_1_stationary | EF-UK-NATGAS-KWH-2024 Full Kyoto CO2e (CO2+CH4+N2O) | 2,738.10 | 3.90 | 1.50 | 2,743.50 kg | [2,674.91, 2,812.09] (±2.5%) |
| L2 | CALCULATED | vehicle_diesel (GB, 2024) 2,400.00 liters • scope_1_mobile | EF-UK-DIESEL-VEH-L-2024 Full Kyoto CO2e (CO2+CH4+N2O) | 5,943.624 | 0.672 | 85.296 | 6,029.592 kg | [5,848.70, 6,210.48] (±3%) |
| L3 | CALCULATED | grid_electricity_location (GB, 2024) 45,000.00 kWh • scope_2_electricity | EF-UK-ELEC-LOC-KWH-2024 Full Kyoto CO2e (CO2+CH4+N2O) | 9,221.85 | 40.50 | 54.90 | 9,317.25 kg | [8,851.39, 9,783.11] (±5%) |
Auditable Provenance & Primary Emission Factor Snapshot
Cryptographic input hash and immutable factor snapshot stored in PostgreSQL calculation_runs for audit reproducibility.
| Factor Code & Gas Coverage | Primary Dataset Source | Dataset Version | Geo / Year | Factor (kg CO₂e) | GWP & CI |
|---|---|---|---|---|---|
EF-UK-NATGAS-KWH-2024 Full Kyoto CO2e (CO2+CH4+N2O) | UK Government GHG Conversion Factors for Company Reporting 2024SRC-UK-DESNZ-2024 | 2024 v1.1 | GB • 2024 | 0.1829 kg / kWh | IPCC_AR5 (±2.5%) |
EF-UK-DIESEL-VEH-L-2024 Full Kyoto CO2e (CO2+CH4+N2O) | UK Government GHG Conversion Factors for Company Reporting 2024SRC-UK-DESNZ-2024 | 2024 v1.1 | GB • 2024 | 2.51233 kg / liters | IPCC_AR5 (±3%) |
EF-UK-ELEC-LOC-KWH-2024 Full Kyoto CO2e (CO2+CH4+N2O) | UK Government GHG Conversion Factors for Company Reporting 2024SRC-UK-DESNZ-2024 | 2024 v1.1 | GB • 2024 | 0.20705 kg / kWh | IPCC_AR5 (±5%) |
Need Market-Based Scope 2 (I-RECs/RECs), Refrigerant Tracking, or Full 15-Category Scope 3?
Transition from partial-scope screening to audit-grade GHG accounting. Compare verified enterprise platforms or inspect our normative regulatory and grid-factor implementation guides.
Normative Methodology & Audit Governance Principles
1. Strict Non-Substitution Policy
If an activity line item requests a country ISO, fuel, or unit combination absent from the verified factor register, the engine returns an explicit MISSING_FACTOR_FOR_GEOGRAPHY diagnostic. Silent fallback to UK, US, or global average factors is prohibited.
2. Scope 1+2 vs. Scope 3 Segregation
In alignment with the WRI/WBCSD GHG Protocol Corporate Standard, operational Scope 1 and Scope 2 location-based totals are aggregated with linear and quadrature (RSS) uncertainty bounds, while optional Scope 3 Category 6 business travel is reported in a strictly separated bucket.
3. Need Full 15-Category Scope 3 or Market-Based Scope 2?
This screening calculator intentionally excludes fugitive refrigerants, contractual REC/GO instrument auditing, and Scope 3 Categories 1–5 and 7–15. Explore our independent software directory for enterprise-grade inventory platforms.
Contextual Methodology & Regulatory Guides
Examine our primary-source research guides covering GHG Protocol operational boundaries, emission factor database selection, Scope 3 activity vs. spend hybrids, and UAE utility grid factors.
GHG Protocol Scope 1, 2 & 3 Operational Boundaries →
Equity share vs. financial/operational control consolidation, Scope 2 dual reporting, and Scope 3 segregation rules.
Factor HierarchySelecting Defensible Emission Factor Databases (DESNZ, EPA, IPCC) →
Tiered source selection, GWP horizon alignment, and audit defensibility across national and regional factor registries.
Value Chain AccountingScope 3 Spend-Based vs. Activity-Based Calculation Methods →
Why EEIO spend screening carries high uncertainty and how to transition to physical activity and supplier-specific factors.
UAE Grid FactorsUAE DEWA & EWEC Grid Emission Factors, Shams Dubai & I-REC Guide →
Sub-national grid factor boundaries for Dubai (AE-DU) vs. Abu Dhabi (AE-AZ) under UAE Federal Decree-Law No. 11 of 2024.