Converting from grams to cups and sometimes from cups to grams is really a difficult thing to do. But let me tell you, this is very easy. The only thing that you need to understand is that you should know the trick to convert 20 grams to cups.
Here it is:
1 by 8 cups is equal to 10 grams
1 by 4 cups is equal to 20 grams
1 by 3 cups is equal to 25 grams
3 /8 cups is 30 grams
However, according to the ingredients values might slightly change.