Free flight emissions calculator
How much CO₂e does
your flight emit?
Calculated using ICAO emission factors. Results shown with and without radiative forcing — the full climate impact of aviation at altitude.
Step 1 — Travel class
Step 2 — Number of roundtrip flights per year
Estimated flight emissions (CO₂e)
0.0
tons CO₂e per year
Source: ICAO Carbon Emissions Calculator methodology. CO₂ only, economy class baseline.
Breakdown by haul type
Total climate impact including radiative forcing (RFI)
At cruising altitude, aviation emits more than CO₂. Contrails, nitrogen oxides, and water vapour create additional warming effects. The radiative forcing index (RFI) accounts for this total climate impact. According to Lee et al. (2021, Atmospheric Environment), the best estimate for the RFI multiplier is 1.9–2.7× the CO₂-only figure. The ICAO calculator excludes RFI to maintain comparability with other transport modes — Decarb shows both figures so you have the full picture. These are estimated ranges, not verified measurements.
What this means in context
Methodology: Base emission factors per roundtrip — short-haul 0.296 t CO₂e, medium-haul 0.608 t CO₂e, long-haul 0.775 t CO₂e (ICAO ICEC methodology). Class multipliers: economy ×1.0, premium economy ×1.6, business/first ×2.0 (seat area allocation method, ICAO Doc 9889).
RFI range 1.9–2.7× from Lee et al. (2021), “The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018”, Atmospheric Environment. Values are estimated averages — actual emissions vary by route, aircraft type, load factor, and weather conditions.
Full methodology: decarb.co/methodology
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