If your mass is 45.5 kilograms, then your weight on earth is about 445.9 newtons (rounded).
On the moon or other planets, your mass is still 45.5 kilograms, but your weight is different,
depending what body you're on.
In space on the way there, your mass is still 45.5 kilograms, and your weight is zero.
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On earth 62.0 kilograms is 607.6 newtons or 136lbs 11oz
On Earth, 300.5 kilograms of mass weighs 2,945 newtons (662.5 pounds). In other places, its weight is different.
Weight in Newtons Mass in kilograms
Weight is measured in Newtons, not grams or kilograms. They are measures of mass which is not the same as weight.
Newtons and kilograms really measure different things (force versus mass). But if you assume normal Earth gravity, each kilogram has a weight of 9.8 Newtons. In this case, you can convert newtons to kilograms, dividing by 9.8.