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KH measurements - what units?

My KH/GH test kit measures (if I recall) mg/L of KH.  This means that I 
get results of numbers like 60.  However, it seems that everything I 
read refers to a KH of single digit numbers, like 6.  What is this 
number, and can I convert my mg/L readings into this?  (for handy uses 
such as finding the CO2 concentration based on KH and pH... all the 
charts seem to use the single digit KH measurement)