Is there way to convert output octets and input octets to KB

Hi there As I say from title is there any way to convert output and input octets to KB because I have small problem when I add to mysql value with 12 number in radtest I get small error it's give me the result just 10 number and note what I insert in SQL , I insert I SQL 10737418240 to limit my users 10 GB for total octets but in radtest I get other result but if I add 10 8 number I get same number in result any help for this ?