A pneumatic seat adjuster for moving a vehicle seat relative to a floor of the vehicle includes a body having a bore formed therein. The body is adapted to be connected to one of a floor and a vehicle seat. A piston is slidably disposed in the bore of the body. The piston and the body define first and second chambers. The piston is adapted to be connected to the other one of the floor and the vehicle seat. The seat adjuster further includes a source of pressurized gas and a valve for selectively supplying pressurized gas from the source into the first and second chambers for altering the pressure differential between the first and second chambers, thereby moving the piston relative to the body.