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Free carbon footprint by flight calculator for per-trip and annual estimates from one-way distance, one-way or round trip, passengers, and trips per year. Tune kg CO₂e per passenger-mile and an optional radiative forcing multiplier to match your planning scenario.
Last updated: April 18, 2026
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Count how many times per year you fly this route pattern.
Mid-range default; replace with airline, ICAO, or offset-calculator factors when available.
Use 1 for CO₂ only; some guides apply ~1.5–2× for high-altitude effects (CO₂e).
Per trip (all passengers)
210 kg CO₂e
Per year (all trips)
420 kg (0.4 t)
Effective distance this trip: 1,000 mi
Passenger-miles per trip: 1,000
Planning note
Typical levers
Trips/year × distance
Increase “same itinerary per year” to see how annual emissions add up.
Distance-driven
Miles dominate totals
Enter great-circle or planned one-way miles; actual track may differ.
Passengers
All seats on the itinerary
Results show total kg for everyone flying that pattern together.
Multiplier
1 = CO₂ scale; >1 = CO₂e-style uplift
Match your internal guidance or leave at 1 for a minimal interpretation.
Methodology
Swap in ICAO or airline factors
The default is a mid-range planning value; replace when you have better data.
Next step
Use vehicle emissions tools
Pair with our vehicle emissions calculator for a fuller mobility picture.
500 mi one-way, round trip, 1 passenger, 2× per year, 0.21 kg/PM, RF 1:
Per trip (all passengers)
210 kg CO₂e
Per year
420 kg (0.4 t)
We compute effective distance (one-way miles × 1 or × 2 for round trip), then passenger-miles per trip = effective distance × passengers. Emissions follow kg CO₂e per trip = passenger-miles × (kg per passenger-mile) × (radiative forcing multiplier). Annual kg multiplies by trips per year. This matches common spreadsheet approaches used in sustainability planning.
effective_miles = one_way_miles × (round_trip ? 2 : 1)passenger_miles = effective_miles × passengerskg_per_trip = passenger_miles × kg_per_PM × RFkg_per_year = kg_per_trip × trips_per_yearPassenger caps and factor bounds in the engine keep inputs in a sensible range for planning.
Aviation emissions are route- and fleet-dependent
Explore diet emissions and net-zero timelines alongside flight estimates.
Get a custom calculator for your platformAnnual tonnes: 0.4 t CO₂e (with these defaults)
Share it with travelers and sustainability teams
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