JETALT
The clean-flight numbers, made simple — free calculators for jet-fuel CO2, SAF blends, fuel burn, fuel energy density, hydrogen and battery range, and fuel cost, plus plain-English guides to sustainable aviation fuel, electric and hydrogen aircraft, and cutting flight emissions.
From the CO2 of a tank of jet fuel and the savings from a SAF blend to the fuel a flight burns, the energy packed into hydrogen and batteries, and what it all costs, JetAlt pairs free hands-on calculators with plain-English guides and a museum of flight and its fuels. Understand the numbers behind cleaner aviation.
Aviation Fuel & Emissions Calculators
Free tools for the numbers behind cleaner flight — jet-fuel CO2, SAF savings, flight fuel burn, fuel energy content, hydrogen & battery range, and fuel cost per flight.
Jet Fuel CO2 Emissions Calculator
Turn a quantity of jet fuel into the CO2 it releases when burned, using the standard 3.16 kg of CO2 per kg of Jet A
SAF Blend & CO2 Savings Calculator
See how much lifecycle CO2e a sustainable aviation fuel blend saves versus conventional Jet A, from the blend and its reduction
Flight Fuel Burn Calculator
Estimate fuel burned from distance and aircraft class — regional, narrowbody, or widebody — with litres, CO2, and per passenger
Fuel Energy Content Comparison Calculator
Compare Jet A, SAF, liquid hydrogen, and batteries by energy per kg and per litre, and see why gravimetric and volumetric energy differ
Hydrogen / Battery Aviation Range Calculator
Estimate range for jet fuel, hydrogen, and batteries from the same on-board mass, once drivetrain efficiency is taken into account
Fuel Cost per Flight Calculator
Turn a fuel quantity and unit price into the fuel bill for a flight, in litres, gallons, or kg, with an optional cost per seat
Flight & Fuel Museum
Step into an illustrated museum of flight and the energy behind it — the aircraft and engines that carry us aloft, the fuels and energy carriers they run on, the alternative and electric aircraft now taking shape, and the story of aviation and the atmosphere, each in its own gallery. Get to know the machines, the fuels, and the physics behind how — and how cleanly — we fly.
Tour the museum →From the Journal
Fresh guides on sustainable aviation fuel, jet-fuel and emissions, electric and hydrogen aircraft, and flight efficiency, plus plain-language explainers on the science and economics of cleaner aviation.
Four Routes to Lower Aviation Emissions, Ranked by Timescale
Aviation decarbonisation is usually discussed one technology at a time, which makes it hard to see how they relate. Put side by side, they sort into a clear…
Why Kerosene Is So Hard to Replace
Kerosene has powered commercial aviation for seventy years, and it is worth understanding why nothing has displaced it — because the reasons are also the…
What Fuel Actually Costs an Airline
Fuel is one of an airline's largest costs and the one that moves most, which is why fuel price is discussed like weather in the industry.
Bigger Aircraft Are Not Always More Efficient
The intuition that bigger aircraft are more efficient per passenger is widespread and, on a fixed route, wrong often enough to be worth checking.
Hydrogen Is a Volume Problem, Not an Energy One
Hydrogen looks like the obvious answer to aviation: it carries nearly three times the energy of kerosene per kilogram and produces no carbon dioxide at all…
The Battery Gap: Why Electric Flight Is Short-Range
Batteries are not a little too heavy for aviation. They are off by more than an order of magnitude, and the gap is best seen by putting the same mass of…
Keep Learning
Plain-language explainers on jet fuel and combustion, sustainable aviation fuel, electric and hydrogen flight, and how aviation affects the climate — everything you need to read the numbers behind cleaner flight with confidence.
Visit the Learn hub →