What is 400 Newtons in Kilograms?

What is 400 Newtons in Kilograms?
Here:
Online Conversion - Convert just about anything to anything else (http://www.onlineconversion.com/)

Since acceleration due to gravity is 9.8 meters/second/second, it takes 9.8 newtons for 1KG (Newtons are measurement of force needed to accelerate mass). Basically, that means that the force (N) is equal to the mass (KG) times 9.8.

Newtons=Kilograms * 9.8

So, plug in the 400, and you can find your answer.
This link Weight and Mass (http://theory.uwinnipeg.ca/mod_tech/node25.html) seems to have a decent, easy to follow explanation.