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Flight Carbon Footprint Calculator
Trip Inputs
Start with an airport pair, add a stopover if needed, or enter distance manually. Results show passenger CO₂, total trip CO₂, optional CO₂e with RFI, and a transparent route breakdown.
Route lookup
Airport lookup uses a built-in list of common airports and estimates flown distance from great-circle distance plus a small routing allowance. Use manual distance for airports not listed or exact itinerary mileage.
Leg details
Edit distance, cabin class, and optional aircraft type for each leg.Advanced factors and assumptions (optional)
Auto / Typical aircraft is acceptable when the aircraft is unknown. If you do know the aircraft, choose a preset in each leg to apply a simple efficiency multiplier. You can also customize the default per-passenger factors below.
Friendly estimate only. Real-world values vary with aircraft type, load factor, routing, weather, and operations.
Results
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Methodology and Sources
The calculator estimates passenger flight CO₂ as distance × emissions factor × cabin multiplier × aircraft multiplier × passengers. If RFI is enabled, the CO₂ total is multiplied separately to show a CO₂e-style warming context figure.
Default factor table
| Distance band | Default |
|---|---|
| Short-haul, up to 1,500 km | 0.150 kg CO₂ / passenger-km |
| Medium-haul, 1,501-4,000 km | 0.120 kg CO₂ / passenger-km |
| Long-haul, over 4,000 km | 0.100 kg CO₂ / passenger-km |
| RFI default | 1.90x when enabled |
Multipliers
| Input | Default |
|---|---|
| Economy | 1.00x |
| Economy Plus | 1.20x |
| Business | 2.00x |
| First | 3.00x |
| Auto / Typical aircraft | 1.00x |
What each assumption means
- Route distance: Airport lookup uses great-circle distance plus a modest routing allowance. Manual distance is available when you have itinerary mileage or an airport is not listed.
- Distance bands: Short flights use a higher passenger-km factor because takeoff and climb are a larger share of fuel burn. Long flights use a lower cruise-weighted factor.
- Load factor: Per-passenger factors assume typical occupancy. Very full or very empty aircraft can shift the per-person result.
- Cabin class: Premium seats take more cabin area and weight per passenger, so the calculator allocates a larger share of emissions to those passengers.
- Aircraft type: Auto / Typical keeps the baseline. Optional aircraft presets apply broad efficiency multipliers for newer, typical, or older aircraft families.
- RFI: RFI is applied after CO₂ is calculated. It represents non-CO₂ warming context, not extra kilograms of carbon dioxide.
Named sources used for the model design
- UK Government GHG Conversion Factors for Company Reporting for public passenger-km air travel factor structure.
- ICAO Carbon Emissions Calculator methodology for route-based passenger allocation concepts.
- IPCC Aviation and the Global Atmosphere for the distinction between aviation CO₂ and non-CO₂ climate effects.
FAQs
How much CO₂ does a flight emit per passenger?
It depends on distance, cabin class, aircraft type, and routing. This tool estimates each passenger's CO₂ by multiplying leg distance by the selected emissions factor, cabin multiplier, and aircraft multiplier.
Is a round trip exactly double?
Here, yes: return mode doubles the outbound route using the same assumptions. For a real itinerary with a different return aircraft or stopover, enter each direction as separate legs.
Why does business class have higher emissions?
Business and first class seats use more cabin area and weight per passenger, so each traveller is allocated a larger share of the flight's emissions.
What is RFI or non-CO₂ warming?
RFI is a multiplier for high-altitude climate effects such as contrails, water vapour, and nitrogen oxides. It does not change the CO₂ mass; it creates a CO₂e-style estimate for context.
Is CO₂e the same as CO₂?
No. CO₂ is the estimated carbon dioxide mass. CO₂e is a broader warming-impact figure after applying the optional RFI multiplier.
Are stopovers worse than direct flights?
Often they are, because they add distance and another takeoff/climb segment. This calculator breaks stopovers into separate legs so the extra distance and band changes are visible.
Why do calculators disagree?
They may use different route distances, passenger load factors, aircraft assumptions, cargo allocation, cabin allocation, lifecycle boundaries, or non-CO₂ multipliers.
Can I use this for business travel reporting?
Use it for quick planning and internal estimates. For formal reporting, follow your organization's required methodology and official conversion factors.
5 Fun Facts about This Flight Calculator
Aircraft presets are multipliers
Choosing a 787 or A350 applies a multiplier (~0.8×) versus the band baseline, while a 747 bumps it to 1.3×—it’s a quick proxy for real fleet efficiencies.
Plane nerd mode
Seat class math is area-based
Premium cabins cost more carbon because the tool multiplies by 1.2 for Economy+, 2.0 for Business, and 3.0 for First—mirroring how much cabin real estate each seat occupies.
Space matters
Short hops “burn” twice
Legs under 1,500 km use the short-haul factor (0.15 kg/km) because takeoff and climb dominate; stretching to long-haul (over 4,000 km) drops the base factor to 0.10.
Band-aware
RFI toggle is a pure multiplier
Flip “Include non-CO₂ effects” and the result is simply multiplied by your chosen RFI (1.9 by default), so you can report both CO₂-only and CO₂e-style numbers side by side.
Transparent RFI