Travel CO₂e Offset Calculator
Estimate your trip's carbon footprint and offset with trees
✈️ Journey Segments
✈️ Flight Emissions
Formula:
Flight emissions (kg CO₂e) = distance × 1.1 × emission factor
Where:
distance= great-circle distance between airports (shortest path on Earth)1.1= detour factor (adds 10% for indirect routing, holding patterns, ATC paths)- Emission factors by flight type:
Domestic (<500 km): 0.255 kg/kmShort-haul (500–3,700 km): 0.156 kg/kmLong-haul (>3,700 km): 0.150 kg/km
- Factors represent average climate impact per passenger-km (includes fuel burn, occupancy, NOx, contrails at altitude)
Aligned with: DEFRA GHG Conversion Factors, ICAO aviation methodology, IPCC
aviation research.
🏨 Accommodation Emissions
Formula:
Hotel emissions (kg CO₂e) = nights × 30.9
Where:
30.9 kg CO₂e per night= estimated average derived from Cornell Hotel Sustainability Benchmark data and related hospitality emission studies.
Informed by: Cornell Hotel Sustainability Benchmark, global hospitality emissions
studies.
🚌 Bus / Shared Transport Emissions
Formula:
Bus emissions (kg CO₂e) = distance × 0.089 kg/km
Where:
0.089 kg CO₂e per passenger-km= average emissions for shared vehicle transport (vans, minibuses, tour buses).
Consistent with: IPCC and DEFRA international transport emission datasets.
🚗 Passenger Car Emissions
Car emissions are calculated by multiplying the total distance traveled (km) by an emission factor of 0.171 kg CO₂e per km. This factor represents the average emissions of a standard passenger vehicle including fuel combustion and associated greenhouse gases.
Formula:
CO₂e (kg) = Distance (km) × 0.171
Example:
A 500 km car journey = 500 × 0.171 = 85.5 kg CO₂e
Source: DEFRA/EEA.