ckbk recently added automatic conversions for recipes which do not include both metric and US cup measurements. Just use the slider on any such recipe to see the quantities in your preferred units (we show the author's original by default).
For example, looking at this recipe for Moroccan-Inspired Sweet and Hot Cherry Tomato Jam:
becomes
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Please let us know if you spot any conversions which do not look right.
The following chart from Real Irish Food by David Bowers may also be useful as a reference.
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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?"