Ecology & Environment

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Flight Emissions Calculator.

Estimate per-passenger flight emissions from explicit fuel burn, fuel factor, distance, and forcing multiplier.

On-device calculationNo signup
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Results update as you type.

Results update automatically as you type.

How to Use

Scenario arithmetic only: every lifecycle or resource factor is entered explicitly; no regional defaults are used.

Use Cases

Estimate your personal flight carbon footprint

Input your flight distance, typical aircraft fuel burn, and number of passengers to get a per-passenger emissions estimate for a single trip.

Example: A 5000 km flight with 3 L/100 km fuel burn, 3.15 kg CO₂e/L, 200 passengers, and a 2× multiplier gives about 472.5 kg CO₂e per passenger.

Compare emissions across different flight scenarios

Adjust fuel burn, passenger load, or radiative forcing to see how these factors change per-passenger emissions for the same route.

Example: Increase passengers from 200 to 300 on the same flight reduces per-passenger emissions by about 33%.

Frequently Asked Questions

How does the Flight Emissions Calculator estimate per-passenger emissions?
It multiplies the flight distance by the fuel burn rate (L/100 km) to get total fuel used, then multiplies by the fuel emissions factor (kg CO₂e/L) to get total emissions. This total is divided by the number of passengers sharing the fuel, and finally multiplied by the radiative-forcing multiplier to account for non-CO₂ effects.
What is the radiative-forcing multiplier?
It's a factor that accounts for the additional climate impact of aviation beyond CO₂ alone, such as contrails and nitrogen oxides. A typical value is around 2, meaning the total climate impact is roughly double the CO₂ emissions. You can adjust it based on your source.
What units should I use for the inputs?
Enter flight distance in kilometers (km), fuel burn in liters per 100 kilometers (L/100 km), fuel emissions factor in kilograms of CO₂ equivalent per liter (kg CO₂e/L), passengers as a number of people, and the radiative-forcing multiplier as a dimensionless factor (e.g., 1, 2, 3).

Tips & Common Mistakes

Tips

  • Use realistic fuel burn values: typical short-haul jets burn around 3-5 L/100 km per seat, but actual values vary by aircraft and load.
  • For a conservative estimate, use a radiative-forcing multiplier of 2, as recommended by many climate studies.
  • Remember that this calculator gives an estimate; actual emissions depend on many factors like altitude, weather, and aircraft efficiency.
  • If you don't know the exact fuel emissions factor, use a common value like 3.15 kg CO₂e/L for jet fuel.

Common Mistakes to Avoid

  • Forgetting to convert fuel burn from L/100 km to L/km: the calculator expects L/100 km, so do not divide by 100 manually.
  • Using total flight emissions instead of per-passenger: the calculator divides by the number of passengers, so enter the total passengers sharing the fuel.
  • Ignoring the radiative-forcing multiplier: leaving it at 1 underestimates the climate impact; use a value like 2 for a more accurate estimate.

Last updated: August 13, 2026