kWh to CO2 Calculator
Enter a kWh figure, choose your energy type, and instantly see the CO2e equivalent with real-world context comparisons.
No account needed. Uses official DESNZ 2024 factors.
Convert kWh to CO2 Emissions
Please enter a value greater than 0.
Energy type
Electricity: 0.207 kg CO2e/kWh · Natural gas: 0.183 kg CO2e/kWh · DESNZ 2024
Time period
for this one-off reading
0 kg CO2e
Car equivalent: DESNZ 2024 average petrol car ~0.170 kg CO2e/km. Tree absorption: ~21.77 kg CO2e/tree/year (standard benchmark). Household figures: Ofgem averages (electricity 2,700 kWh/yr; gas 11,500 kWh/yr).
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What is a kilowatt hour and why does it matter for carbon reporting?
A kilowatt hour (kWh) is the standard unit of energy used by UK energy suppliers on your bills. It represents the energy consumed by a 1,000-watt appliance running for one hour - or a 100-watt bulb running for ten hours. For carbon reporting purposes, kWh figures are the starting point for every Scope 1 and Scope 2 calculation. Whether you are completing a Carbon Reduction Plan for a public sector tender or building an annual carbon inventory, your gas meter readings and electricity invoices give you kWh data that must be converted into CO2 equivalent (CO2e) using the appropriate emission factor. Getting this conversion right is the foundation of credible carbon reporting.
The DESNZ 2024 UK electricity grid factor: 0.207 kg CO2e/kWh
The Department for Energy Security and Net Zero (DESNZ) publishes updated greenhouse gas conversion factors every year. For 2024, the UK electricity grid emission factor is 0.207 kg CO2e per kWh - down from 0.233 in 2022, reflecting the continued growth of renewable generation on the national grid. This factor changes annually because the grid mix shifts as more wind, solar, and nuclear capacity comes online. That is why any carbon report or Carbon Reduction Plan must state the year of the factors used. Using an outdated factor can overstate or understate your Scope 2 emissions significantly, which matters when benchmarking or verifying claims with customers.
Natural gas: 0.183 kg CO2e/kWh - Scope 1 not Scope 2
Natural gas combustion produces 0.183 kg CO2e per kWh (DESNZ 2024, gross calorific value basis). Unlike electricity - which is a Scope 2 emission because it is generated off-site - gas burned in your own boilers, furnaces, or process equipment is a Scope 1 emission: a direct emission from a source you own or control. This distinction matters for reporting frameworks such as GHG Protocol and PPN 006, which require Scope 1 and Scope 2 to be reported separately. If your business buys heat or steam from a third party rather than generating it yourself, that consumption shifts to Scope 2 and a different factor applies. When in doubt, use the location-based method and the DESNZ published factor for your fuel type.
Why UK businesses need these figures for PPN 006 Carbon Reduction Plans
Since September 2021, UK public sector procurement policy note PPN 006 has required suppliers bidding for contracts over £5 million per annum to publish a verified Carbon Reduction Plan. That plan must include a current-year baseline carbon footprint covering Scope 1 and Scope 2 emissions at a minimum, expressed in tonnes of CO2e. Converting your energy bills from kWh to CO2e using the DESNZ factors is the core calculation behind that baseline. Buyers are increasingly checking whether the factors used are current and correctly applied. Using this calculator gives you the correct DESNZ 2024 numbers instantly - and platforms like CarbonVerified can help you build the full documented baseline and reduction commitments your CRP requires.
Related tools and guides
- Business Carbon Savings Calculator - estimate annual cost savings and CO2 reduction from practical energy measures
- PPN 006 compliance checker - check whether your existing Carbon Reduction Plan meets PPN 006 requirements
- How CarbonVerified works - measure your full Scope 1, 2 and 3 emissions and generate a compliant CRP