In the near future, ckbk plans to add the ability to automatically convert between US cups and metric measurements.
In the meantime, the conversion chart below can be found in Real Irish Food by David Bowers may be useful.
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Also, if you have access to Amazon Alexa, Apple's Siri or Google Assistant, try the following style of questions:
"Hey Siri, how many grams is 2 cups of superfine sugar?"
"OK Google, how much is 400 grams of flour in cups?"
"Alexa, how much does 7 tablespoons of butter weigh?"