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Personal Carbon Footprint Calculator: Annual Estimate
Estimate your annual carbon footprint for home energy, car travel, flights and diet. Set your own electricity grid factor and flight distances, then compare the category totals in tonnes of CO2e.
Personal Carbon Footprint Calculator: Annual Estimate: Multiplies annual activity by the 2026 UK Government factors. Diet uses Scarborough et al. (2023), Nature Food, Table 3 daily medians multiplied by 365. Shopping is omitted because no defensible low, medium and high factors were established. The result covers only the displayed categories. Runs 100% locally in your browser with zero server file uploads.
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Estimate one person's annual footprint for the categories below. The starting amounts are editable examples. Enter your share of household energy, excluding car charging already counted under car travel.
Start with your largest categories
- Diet: consider more plant-based meals and reduce food waste.
- Home energy: start with the largest energy use on your bills; reduce heating demand and wasted electricity where practical.
- Car travel: replace suitable car journeys with walking, cycling or public transport, and combine trips.
DESNZ/DEFRA 2026, Open Government Licence v3.0 · Scarborough et al., Nature Food (2023), Table 3
Energy and travel
UK Government GHG Conversion Factors for Company Reporting 2026, revised flat-format workbook: Fuels, UK electricity, Business travel- land and Business travel- air. Contains public sector information licensed under the Open Government Licence v3.0. Source: https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2026
Diet
Scarborough P, Clark M, Cobiac L, et al. Vegans, vegetarians, fish-eaters and meat-eaters in the UK show discrepant environmental impacts. Nature Food 4, 565–574 (2023), Table 3. https://doi.org/10.1038/s43016-023-00795-w
How to use it
- Enter your annual share of home energy and your electricity grid factor.
- Add car distance, one-way flight counts and average distances, then choose a diet group.
- Read the breakdown and tips ordered by your largest categories.
Privacy & limitations
All calculations run in your browser. Your activity data is not uploaded.
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Frequently asked questions
Is the electricity factor right for my country?
The starting factor is a labelled UK 2026 generation example: 0.13096 kg CO2e per kWh. Replace it with a suitable local or supplier factor. No per-country table is included.
What do the car factors cover?
They represent average UK cars. Petrol, diesel and non-plug-in hybrid factors cover direct operation. The battery electric example includes UK electricity generation and network losses and does not follow the home grid input. Vehicle manufacture and upstream fuel supply are excluded.
How are flights counted?
Enter one-way flights; a return journey counts twice. Starting distances of 1500 km and 6500 km are editable scenario assumptions, not sourced statistical averages. The estimate uses economy-class UK-linked factors with radiative forcing.
How accurate is the diet estimate?
It uses UK study medians standardised to 2000 kcal per day, age and gender. Food production varies considerably, so these groups are broad estimates, not precise individual measurements or nutrition targets.
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