How much CO2 does your flight really produce? How to know if carbon footprint claims are accurate

By Finn McFall, KTP Associate, University of Surrey
Xavier Font, Professor of Sustainability Marketing, University of Surrey

When two people book the same flight, they can get wildly different carbon footprints from online calculators. Many carbon calculators leave out big chunks of climate impact or rely on oversimplified assumptions.

Here’s what’s missing, why it matters and a practical checklist you can use to judge any flight estimate.

1. CO₂ isn’t enough

If a tool only reports in kilograms of carbon dioxide (CO₂), it misses two other groups of emissions:

Carbon dioxide equivalent (CO₂e) is a metric that converts the impact of other…

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