How much a rocket weight?

There is no single answer because launch vehicles span three orders of magnitude. Rocket Lab's Electron, a small launcher for satellites of a few hundred kilograms, weighs about 13 t at lift-off. Falcon 9, the most flown orbital rocket in the world, weighs roughly 549 t. Europe's Ariane 6, in its four-booster version, lifts off at around 870 t. NASA's Saturn V came in at about 2,800 t, the Space Launch System at around 2,600 t, and SpaceX's Starship with its Super Heavy booster at close to 5,000 t, the heaviest vehicle ever to leave a pad (figures as of January 2025).

The reason those numbers are so large is that a rocket has to carry its own oxidiser as well as fuel, and the mathematics of the rocket equation demand that propellant make up the overwhelming majority of the mass. On Falcon 9, propellant accounts for roughly 95 percent of the take-off weight; the structure, engines and tanks add a few percent, and the payload, the part that actually reaches orbit, is often under 4 percent. For Saturn V the payload sent toward the Moon was about 45 t out of 2,800 t launched, under 2 percent.

A rocket is lighter with every second of flight. The first stage of Falcon 9 burns through more than 400 t of propellant in about two and a half minutes, so by the time it separates the vehicle has shed most of its lift-off mass. This is why thrust needs to exceed weight by only a modest margin at ignition: acceleration builds naturally as the tanks empty. Engineers care less about absolute weight than about ratios: thrust to weight at lift-off, propellant fraction of each stage, and the payload fraction that measures how efficiently the whole design converts propellant into useful mass in orbit.