But that is problematic with materials that vary in density, for example if hydration level varies between batches. Of course most of the time we don’t care about that.
The few times I’ve used a US recipe, I’ve laboriously gone through the ingredients to see what 1 cup of oats, lentils, etc weighs in grammes.
Exactly what I do. Handy hint:- It is less laborious if you screenshot your recipe and copy it to AI asking it to convert all measurements to grammes. How do you know if it is an Standard American cup or Legal American cup.?
Is that a trick question? 
I don’t need to do this very often and I’m so anti-AI that I would rather go through the pain and do the conversion the old-fashioned way. It’s fine. 
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No, definitely not a trick question Jennifer. I do it all the time. I find recipes on the internet are far to verbose, especially on the YouTube so I post an image or URL to Chatty and ask for a printout with ALL measurements of ingredients in grammes and in a format that I define. For example I hate ingredient lists. I want my recipe to say add 100 grms of flour to bowl and NOT add flour to bowl then having to scroll back to find out how much flour to add. But if AI is not your thing that does not help you very much.
Or get a set of US cup measures!
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Standard cup or legal cup?
A very interesting point. I just made some toast with 35 grammes of bread. The finished toast weighed 30 grammes. That is 15% less. That is why toast contains more calories per 100 grammes than bread.
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Nice!
Don’t forget those super precise French measurements the hazelnut, walnut, yoghurt pot and mustard glass. 
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And the soupçon
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Whatever was on the shelf in Target
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How many soupçons in a portion of soup?
(French onion, before adding the toasted bread slices, to avoid ambiguity. 
)
A chouïa
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I’ve decided to mute this thread as its title annoys me each time I see it 
over and out
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Exactly, grams and kilos, cm and mm are fine.
It’s not so much the choice of unit of measurement that gets to me, but more when something is advertised and sold as being a certain size when it simply isn’t. Take window units for example; It’s advertised as being 60cm by 40cm but I can’t find anything on said window / frame assembly that is that size. The glass area isn’t, neither is the opening part of the window, and certainly the frame measurements aren’t. The only way to find out the real exact size is to go to the Brico and measure it yourself.
Then there is rough sawn timber which is never the advertised size. The so called 75 x 40 is not only substantially smaller, but varies in actual size according to where one makes the purchase. Very aggravating !
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It’s probably just a regional measurement preference. In some European recipes, centiliters (cl) are used quite often, so 12.5 cl is the same as 125 ml. For people used to that system it might actually feel normal, even though ml is more common and clearer for many readers.
If you do some research on ‘nominal’ (or ex) and ‘finished’ sizing in timber you will find the answer.
Similar principle applies to off the shelf windows and door frames in that they are offen smaller to allow for tolerances in construction.
Once you understand the principles, rough sawn timber sizing becomes easier but finished sizes should always be what is stated.