Used a couple of US recipes recently and most of the ingredients are in cups, or spoons, not by weight. This is a nightmare to convert. Do Americans not own scales or something? What's the reason for measuring everything by volume?
The units used in the kitchen make sense, firstly because cups, spoons and shit are common things found in the kitchen, secondly because precision is not really a priority and thirdly because coocking is about proportions.
I usually take a piss on the american pathetic unit system anyway
I would guess use the ones that are sized like most other cups. Like standard mug sized. Although i think its all relative. If you use a certain cup to measure flour, use the same cup to measure sugar.
Otherwise you can buy a set of cup and spoon measures for super cheapnon amazon. They fit in my cutlery drawer.
I think that an american cup holds something like 230 cm3. Thats a horribly small cup for me (mines range from 250 to 450). I tend to use the ones that have 250 cm3 capacity and thats my definition of cup... or i can always use half a metric pint instead.
All this gibberish about units makes me feel like an idiot, so i will confess: i use a scale and metric cups. 250 cm3 water, or milk are roughly 250g