FLY is a flight emissions calculator built on the ICAO fuel-burn methodology. Enter a flight number and get the live aircraft type from FlightRadar24, or enter a route directly. FLY calculates your exact kg CO2 using real aircraft fuel consumption profiles across 65+ types — from Airbus A318 to Boeing 777-9.
Unlike per-km calculators that apply a generic emissions factor, FLY uses aircraft-specific fuel burn rates from ICAO documentation. A 787-9 burns significantly less fuel per seat than an A340 on the same route, and that difference shows in your result.
Features
What makes FLY more accurate
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Flight number lookup
Enter your flight number to pull the live aircraft type via FR24. No more guessing which 737 variant is on your route.
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65+ aircraft profiles
From regional turboprops to A380. Each type has its own ICAO fuel consumption profile, not a generic fleet average.
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Cabin class accuracy
Economy, premium economy, business class. Multipliers based on seat floor space ratios, not arbitrary numbers.
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Real route distances
25,600+ IATA great-circle distances. Multi-city trips calculated per leg with a running total.
Free Calculator
Calculate your flight emissions
Free, no account needed. Get your exact kg CO2 and optionally support verified removal. Takes 30 seconds.
Flight emissions calculators use route distance, aircraft type, and fuel burn rate to estimate CO2 per passenger. FLY uses ICAO methodology: real aircraft fuel consumption profiles, actual great-circle route distances, the ICAO CO2 factor of 3.15 kg CO2 per kg jet fuel, and seat floor-space weighting for cabin class.
CO2 measures only carbon dioxide. CO2e includes other warming effects like NOx, contrails, and high-altitude water vapour. Aviation's total climate impact is estimated at 2-4x the CO2 figure because contrails and high-altitude NOx have stronger warming effects. FLY reports CO2 using the ICAO standard; some researchers apply a multiplier to estimate total warming.
Calculators differ in methodology (ICAO fuel-burn vs. generic per-km), aircraft specificity, cabin class treatment, and whether they include indirect routing factors. FLY uses ICAO methodology with real aircraft types and floor-space multipliers, which typically gives higher figures than simple per-km calculators because it captures actual fuel burn.
London-New York in economy typically produces 450-650 kg CO2 per passenger depending on aircraft. Business class on the same route produces 1,200-2,000 kg CO2 per passenger due to the 3-4x floor space multiplier. FLY calculates the exact figure based on the real aircraft type on your route.
Yes. Enter your flight number into FLY and it looks up the route and aircraft type via FlightRadar24's live database. This gives you the actual aircraft type on your specific flight, more accurate than a route average that may cover several different aircraft types.