The Flight Carbon Ledger

A year of flying counted honestly: every leg measured, the right factor for the distance and the seat, both figures labeled, the biggest cuts first, and what is left priced in tonnes at the price you are quoted

FatGas.com's Flight Emissions Calculator gives one flight at a time. Our Carbon Footprint Calculator counts every one-way flight as a flat 250 kg or 1,100 kg, and our Carbon Offset Calculator prices tonnes, while our flight figures come out in kilograms. Writing this workbook we also fixed the flight calculator itself: it used one factor for every flight and put a 400 km hop at 46 kg, where the UK government's 2025 conversion factors (DESNZ) give 91.7 kg with the extra warming at altitude and 54.2 kg without it. The Flight Carbon Ledger carries those tools through a year. You measure each leg airport to airport, use the DESNZ factor for its distance and seat, keep the figure with the altitude effect apart from the fuel-only one, and build the year's ledger beside the flat count. In the worked example, four return trips come to 3,625.5 kg with RF where the flat count says 5,400, and changing one London return from business to economy saves 2,463.8 kg, more than every other change in the example combined. Then the levers are ranked, and what is left is priced in tonnes at the price you are quoted. Every figure is an example, computed by the code our calculators run. The workbook names no airline or offset seller, quotes no market price, and never says a credit cancels a flight: a credit funds a project, so it gives seven questions to ask before you pay and a plain way to describe what you bought. Included: 24 printable pages with seven steps, four working pages, a reference table by distance and seat, a quickstart, and a personalised sheet worked from the numbers you enter in our calculators.

What’s inside

The full contents of The Flight Carbon Ledger: count it right, cut then price what is left, and the working pages

Step 1, The Great-Circle Rule: each flight leg measured airport to airport, with example routes in kilometers and miles

The Great-Circle Rule: every leg measured airport to airport, once, with connections as separate legs
The Band and Seat Rule: the DESNZ 2025 factor for each leg's distance and seat, and why short hops cost most per kilometer
The Two-Number Rule: the figure with the altitude effect and the fuel-only figure, kept apart and labeled
The Every-Leg Ledger Rule: your year built leg by leg beside the flat count, to see how far off it was
The Biggest-Lever Rule: the trip, the seat, the train or a shared car, and the connection, ranked by what each cuts
The Tonnes-Not-Kilograms Rule: what is left priced in tonnes at the price you are quoted, and the kilogram trap
The Funded-Not-Erased Rule: seven questions to ask about any credit, and a plain way to describe what it funds
Four printable working pages: flight ledger sheet, trip choice worksheet, credit check sheet, year review
A reference table of kg per passenger by distance and seat, with the ratios behind it
A quickstart checklist and a personalised sheet worked from your own calculator inputs

Plus a second PDF, worked out for you

Run one of the free calculators first and buy from that page, and this sheet is computed from your own figures. Buy from here and the pack still arrives complete — the sheet simply has no numbers of yours to work from yet.

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$15.00 including any taxes · PDF, 24 pages · instant download, link valid 7 days and 5 downloads.
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