The objection people advance for using weights rather than volume measurements is that volumes for some key ingredients- like flours- can vary a lot according to how the cup is loaded; unfortunately you run into the same problem using tables. The figure on the table is based on someone's notion of how the cup should be loaded; if it doesn't coincide with the recipe author's ideas, you're no better off than by using volumes.
Sorry I don't know what gr/cp is, but, as the other comment says, King Arthur Flour is a good place to go for all kinds of baking information. You seem to be looking for metric measurements, and the King Arthur site has a pretty extensive ingredient weight list. Just search their site for ingredient weight chart.
My go-to spot is https://www.kingarthurflour.com/learn/ingredient-weight-chart.html There are plenty of others on the internet, but I've found this one to be the most inclusive. Some of the things they list are their products, but it's still generic enough to be very useful for conversion purposes.
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There are plenty of others on the internet, but I've found this one to be the most inclusive. Some of the things they list are their products, but it's still generic enough to be very useful for conversion purposes.