You got your facts all mixed up.
1 Newton = the force needed to accelerate a mass of 1 kg to an acceleration of 1 m/s²
Thus, force in Newtons = mass x acceleration
Weight = gravitational force acting on a mass and accelerating it to g (acceleration due to gravity at sea level = 9.8 m/s²)
Thus, weight in Newtons = mass x g
JohnTan is right: weight is measure in N, mass in kg.