Agreed with Msmayor. 8 oz. of dry macaroni is a weight measurement (but 8 oz. of milk is a volume measurement and is 1 cup). If you don't have a kitchen scale for weight measurements: one lb. = 16 oz., 1/2 lb. = 8 oz. = 250 grams.
There are 2.2 lbs to 1 kg. That's where the 1.1 lb came from. (Not that it's right, but that is where it came from anyways.) The PP thought that 1/2 lb. would be 1.1 kg.
Metric is SO much easier once you get the hang of it. I really don't see it happening any time soon here in the US. Oh well!
When in doubt just do a google search for "online conversion" the first result is great. They have a weight to volume conversion for cooking that is very helpful. Good luck!
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