Weight = mass*g, where g is the acceleration due to gravity.
W = 70kg*9.807m/s^2 = 686.49 N (Newtons of force)
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"Pound" is a unit of force. "Kg" is a unit of mass. They don't convert directly. On Earth, 70 pounds is the weight of 31.751 kg of mass. (rounded) On the moon, 70 pounds is the weight of 191.858 kg of mass. (rounded) In other places, 70 pounds is the weight of different amounts of mass.
Your mass is always the same.
From Wikipedia, the gravitational acceleration on the Moon (on its equator) is 1.622 m/s2. This is the same as 1.622 N/kg, so you can multiply the mass by this number to get the weight in Newton. (The man's mass, of course, will still be 70 kg on the Moon. His weight will change, but his mass will not change.)
About 700N 70kg • 10m/s = 700N
Weight is a measure of the gravitational pull for a mass , such that a mass of 1 Kg is having a weight of 10 Newton . So weight is a downward force measured in Newtons . Weight ( in N ) = Mass ( in Kg ) × Gravity ( usually 10N/Kg )