✈️ Flight Emissions Calculator
Enter a flight's distance, passengers, and cabin class to estimate its CO2 emissions per passenger and in total — with a round-trip option — so you can weigh the climate cost of a journey before you book.
✈️ Estimate a Flight's CO2
What is a Flight Emissions Calculator?
Air travel is one of the most carbon-intensive things an individual can do, and its footprint is easy to underestimate. This calculator estimates the CO2 released by a flight from three inputs — how far you fly, how many people are travelling, and which cabin you sit in — using an average intensity of 0.115 kg CO2 per passenger-kilometre scaled by cabin class.
Use it to compare routes, decide between a direct flight and a connection, or weigh a trip against lower-carbon alternatives like rail. The figures are planning estimates for direct CO2 only; the full climate impact of aviation, including contrails, is higher.
❓ Frequently Asked Questions
How are flight emissions calculated?
This tool multiplies the flight distance by 0.115 kg CO2 per passenger-kilometre — an average intensity for a typical jet — and then by a cabin-class multiplier. It doubles the distance for a return trip and multiplies by the number of passengers for the total. The result is shown per passenger and in total, in kilograms and tonnes of CO2.
Why do business and first class emit more than economy?
Premium seats take up far more of the cabin's floor space, so each passenger is responsible for a larger share of the aircraft's fuel burn. This calculator reflects that with multipliers of 1 for economy, 1.6 for premium economy, 2.9 for business, and 4 for first — so a first-class seat carries roughly four times the footprint of an economy seat on the same route.
Does flying really matter that much for the climate?
For people who fly, it is often the single largest part of their carbon footprint. One long-haul return flight can emit more than a tonne of CO2 per passenger — comparable to months of driving or a large share of an average person's annual budget. Flying less, choosing direct routes, and travelling in economy are the most effective ways to cut aviation emissions.
Does this include the non-CO2 warming effect of flying?
No. Aircraft also create contrails and release other gases at altitude that add to warming — an effect often captured with a radiative-forcing multiplier of roughly 1.9. This calculator reports direct CO2 only, so the true climate impact of a flight is likely higher. Treat the figure as a conservative planning estimate.