Free Tool

SECR Emissions Calculator

Estimate your Scope 1, 2, and 3 carbon emissions using DESNZ 2025 conversion factors. No sign-up required.

Enter Activity Data

DESNZ 2025

kWh

kWh

Conversion Factors Used

DESNZ 2025 UK Government GHG Conversion Factors

Source	Factor	Unit
Diesel	2.51	kgCO₂e / litres
Petrol	2.31	kgCO₂e / litres
Natural Gas	0.18258	kgCO₂e / kWh
Grid Electricity	0.20707	kgCO₂e / kWh
Short-haul flights	0.15553	kgCO₂e / km
Long-haul flights	0.19085	kgCO₂e / km
Company car (avg)	0.16844	kgCO₂e / km
Rail travel	0.03549	kgCO₂e / km

Total Emissions

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tCO₂e

Scope 1Direct combustion

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Scope 2Purchased electricity

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Scope 3Business travel

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Estimates only. DESNZ 2025 factors used. For auditable filings, use SECR-ESG.

How to use this SECR calculator

1. Enter your activity data

Add rows for each type of energy — fuel, electricity, gas, business travel.

2. See instant results

Emissions calculated in real time using DESNZ 2025 factors, split by Scope 1, 2, and 3.

3. Generate your full report

For a complete SECR disclosure with narrative and PDF export, sign up for a free trial.

Conversion factors sourced from DESNZ 2025 UK Government GHG Conversion Factors. Estimates only — use SECR-ESG for auditable, filed disclosures.

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