When I do the math in my head I use 30 g per ounce for simplicity.  I was 
taught 28 point something.  Never heard of using 35 g per ounce, ever.  What 
does Medela say is the reason for that?   
When I don't do the math in my head I use the calculator function in my 
computer or my cell phone, whatever is handiest.  I convert the English 
weight into a decimal value, by dividing the number of ounces by 16 and 
adding that decimal fraction to the number of pounds.  Then I divide that 
number by 2.2, which is what I was taught was the conversion factor from 
pounds to kilograms.  
Next time I am at work I will check to see what our infant scales use as a 
conversion factor.  It has never occurred to me that it might be something 
other than 28 point whatever.  But since we only ever use the pounds and 
ounces display to show US ex-pats a number they can report to the folks 
back home, it doesn't much matter.
Rachel Myr
thankful for the simplicity of working in the metric system, in Kristiansand, 
Norway

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