text: physics conversion.? how many newtons are in a kilogram? a kilogram(kg) is a measurement of mass.  a newton(n) is a measurement of force.  think of a mass measurement as measurement of how much stuff there is in an object.  a force measurement is the product of how much stuff there is multiplied by an acceleration of the stuff.  force equals mass times acceleration.  f= ma.  think of it this way, imagine you have a bowling ball.  on earth and on the moon, the ball has the same mass(m).  on earth, the ball is heavier because earth's gravity is stronger(gravity is the acceleration in the equation (a)).  lets assume you have a 1kg mass.  on earth the acceleration due to gravity is 9.81 meters per second squared(m/s^2).  a kg is therefore 1x9.81= 9.81 newtons on earth.