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Flight Emissions Calculator

Estimate flight CO2e from distance, passenger count and a transparent emission factor.

Flight factors vary by aircraft, route, load factor, cabin class and non-CO2 treatment. Replace defaults with your chosen source when available.

Method

Distance is converted to passenger-kilometres, multiplied by passenger count, emission factor and cabin/uplift multiplier. Round-trip mode doubles distance.

Example

A 3,000 km round trip for one passenger at 0.115 kg CO2e per passenger-km gives 6,000 x 0.115 = 690 kg CO2e before any cabin or uplift multiplier.

Common mistakes

Check whether your distance is one-way or round trip. If your source already includes uplift or non-CO2 effects, do not add the same multiplier again.

Limitations

Flight emissions vary by aircraft, routing, load factor, cabin class and accounting method. This is a transparent estimate, not a certified carbon inventory.

References

Last reviewed: 2026-05-17

Before relying on this result

Use this calculator together with the formula, assumptions, limitations and examples on the page. If the topic involves health, tax, lending, investment, legal, safety or current-rate decisions, treat the number as an estimate and check the relevant primary source or professional guidance.

Calculator metadata last reviewed: 2026-05-14.