About JetAlt

Aviation is one of the hardest parts of the economy to decarbonize, and one of the most talked about. Sustainable aviation fuel, hydrogen aircraft, battery-electric planes, contrails, carbon offsets — the headlines fly thick and fast, but the numbers underneath them are rarely put in front of anyone. JetAlt exists to close that gap: to take the physics and arithmetic of flight’s fuel and emissions and make them something you can actually work out for yourself.

Each calculator answers one concrete question. The Jet Fuel CO2 Emissions Calculatorturns a quantity of kerosene into the carbon dioxide it releases, using the industry’s standard factor of 3.16 kg of CO2 per kilogram of fuel. The SAF Blend & CO2 Savings Calculatorshows how much lifecycle carbon a sustainable-fuel blend actually saves — and why a modest blend of a partly-cleaner fuel yields only a modest cut. The Flight Fuel Burn Calculator estimates the fuel a flight uses from its distance and aircraft class, and the fairer figure of fuel per passenger. The Fuel Energy Content Comparisonlays Jet A, SAF, liquid hydrogen, and batteries side by side to explain why hydrogen is light but bulky and why batteries can’t yet cross oceans. The Hydrogen / Battery Aviation Range calculator turns those energy figures into estimated range, and the Fuel Cost per Flight Calculatorprices the fuel bill and what SAF’s premium adds to it.

Around the calculators, the blog and learn section dig into jet fuel, sustainable aviation fuel, electric and hydrogen flight, and aviation’s climate impact, and the Flight & Fuel Museumis a browsable collection of the aircraft and engines, the fuels and energy carriers, the alternative and electric aircraft, and the atmosphere behind it all — with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. JetAlt is independent, and not affiliated with any airline, aircraft or engine maker, fuel producer, or aviation body. It is supported by advertising, which is how the calculators stay free and account-free. Every figure a tool produces is an educational estimate built from the numbers you enter and representative industry values — not certified emissions data, fuel-planning software, or engineering advice. For operational, regulatory, or investment decisions, rely on certified figures and qualified specialists. If a tool looks wrong, or you can think of one that belongs here, the contact page is where to tell us.