Impact Tech Solutions · HSE Calculators
CARBON / GHG

Carbon Footprint / GHG Emissions Calculator

GHG = Greenhouse Gas. Estimates Scope 1 (direct fuel combustion) and Scope 2 (purchased electricity) emissions in CO₂e (carbon dioxide equivalent), following the GHG Protocol Corporate Standard, using published EPA and UK DEFRA (Department for Environment, Food & Rural Affairs) conversion factors.
Scope 1 — Direct Fuel Combustion
Scope 2 — Purchased Electricity
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Scope 1 (kg CO₂e)
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Scope 2 (kg CO₂e)
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Total (kg CO₂e)

Emission Factor Reference

Diesel2.57 kg CO₂e / litre (DEFRA 2025)
Petrol / Gasoline2.07 kg CO₂e / litre (DEFRA 2025)
Natural Gas0.183 kg CO₂e / kWh gross CV (DEFRA 2024)
LPG / Propane1.51 kg CO₂e / litre (EPA/GHG Protocol-based)

Scope Definitions

Scope 1 — direct emissions from sources owned or controlled by the organization (fuel burned on-site or in company vehicles).
Scope 2 — indirect emissions from the generation of purchased electricity, steam, heat, or cooling consumed by the organization.

Methodology, interpretation & sources

Purpose. GHG = Greenhouse Gas. Estimates Scope 1 (direct fuel combustion) and Scope 2 (purchased electricity) emissions in CO₂e (carbon dioxide equivalent), following the GHG Protocol Corporate Standard, using published EPA and UK DEFRA (Department for Environment, Food & Rural Affairs) conversion factors.

How to use the result. Start with source data you can verify, enter values on a consistent unit and time basis, and record the assumptions used. The main inputs on this page include Fuel Sources Add one row per fuel type consumed (boilers, generators, vehicles, etc.) in the reporting period., Electricity Consumed (kWh), Grid Region, Custom Grid Emission Factor (kg CO₂e/kWh), Your Name, Email. Re-run the calculation when those assumptions change rather than carrying an old result forward.

Decision use. Use this tool for scenario planning and comparison rather than as a substitute for professional financial advice. Financial assumptions can change the result materially, so test more than one scenario instead of relying on a single output.

Limitations. Check the time period, rate convention, compounding assumption and cash-flow timing before interpreting the result. Small changes in rates or timing can have a large cumulative effect.

Primary references. Use the current edition/version that applies to your jurisdiction and organization:

Editorial note. Prepared and maintained by Impact Tech Solutions. Editorially updated 28 September 2026. No individual professional credential is claimed on this page; high-consequence, statutory, tax, engineering or health decisions should be independently verified against the current primary source and, where required, a qualified professional.

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