Estimate an annual per-person carbon footprint from driving, flights, home energy, and diet, then see which single change would cut the most, sized from your own numbers.
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
Home energy is a household bill, so it is divided by this number to give a per-person figure. Travel and diet are already per person.
Count return trips per year. Short-haul is roughly under 250 miles each way, long-haul over 2,000.
home energy is the largest share at 35% of your per-person total.
About 2,254 kg a year, 25% of your footprint. On a grid at 370 g CO₂e/kWh, the same mileage would emit about 866 kg.
| Home energy | 3,159 kg35% of your total |
|---|---|
| Driving | 3,120 kg34% of your total |
| Diet | 2,500 kg28% of your total |
| Flights | 198 kg2% of your total |
| Public transport | 93 kg1% of your total |
| Your total | 9.1 tPer person, per year |
| Household total | 18.1 t2 people |
| Global average | 4.7 tYou are at 193% of it |
| 1.5 degree pathway | 2.3 tYou are at 394% of it |
| Switch the car to electric | −2,254 kg25% of your footprint · On a grid at 370 g CO₂e/kWh, the same mileage would emit about 866 kg. |
| Drive half as far | −1,560 kg17% of your footprint · Combine trips, work from home more often, or shift short journeys to transit, cycling, or walking. |
| Move one step down the diet ladder | −500 kg6% of your footprint · Shifting from average to low meat eating. |
| Cut household electricity by 20% | −377 kg4% of your footprint · Efficient lighting and appliances, a lower standby load, and better heating and cooling control. |
Emission factors are planning averages from EPA, DEFRA, and IEA-derived grid intensities, not a measurement of your own consumption. Diet figures are population averages and vary widely with what you actually buy.
Practical notes about the inputs, assumptions, and result.
Personal. Home energy is entered as a household bill and divided by the number of people, and car emissions are divided by the number of people usually in the car. Flights and diet are already per person. The household total is shown separately so both numbers are explicit.
Because that is how it works. An EV emits nothing at the tailpipe, so its footprint is whatever the electricity cost to generate. At 60 g CO₂e/kWh the same mileage is a small fraction of a hybrid's; at 700 g/kWh the gap nearly disappears. A single fixed EV factor hides that entirely.
Aircraft warm the climate through contrails and other high-altitude effects as well as CO₂. A multiplier of about 1.9 is commonly applied to account for it. It is off by default because it is a modelled uplift rather than a measured emission, and reasonable sources disagree on the figure.
Each one is recomputed from your own inputs. Switching to an electric car uses your mileage and your selected grid; flying economy uses your actual cabin and trip count; cutting food waste uses your current waste level. They are then sorted by saving, so the top item is genuinely the biggest lever for you rather than generic advice.
Two benchmarks are shown and they do not contradict each other: about 4.7 tonnes per person is the global average, and about 2.3 tonnes is the per-person level commonly cited for a 1.5 degree pathway by 2030. Wealthy countries typically sit far above both.
No. This is a screening estimate built on population averages. Offset purchases, corporate reporting, and compliance all need an inventory based on your actual meter readings, receipts, and itineraries.
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