Well there's no exact answer because usually in an enviorment where kilo newtons are being used like in climbing and material sciences stretch will be a factor so its not exact. But roughly 2 pounds to every 9 newtons. Here's a quick paragraph that goes more in-depth then i can.
http://www.newton.dep.anl.gov/askasci/phy00/phy00550.htm
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1 kilo
85 kilos is 13.4 stone.
1 kilo is about 0.16 stone. So, multiply kilos by 0.16: 54kg x 0.16 = about 8.5stone
0.101971621
It is not normal to say giga-kilo (this would actually be tera). Anyway giga means 109 or a billion