The easiest way to figure grams or ccs to cups that I have found is to purchase a digital scale that allows you to weigh ingredients in a variety of different units. I have the:
Amiloe MAX 33lb Kitchen Scale with Measure Length(8inch), Food Scales Digital Weight Grams and Oz with Shrink Hook, 6 Units, Tare Function, High Precision to 1g/0.1oz for Baking and Cooking
Which I purchased on Amazon for about $20. It measures in grams, ounces, milliliters, lbs, kilograms and cubic centimeters. It also has a function which allows you to place your empty container on the scale, then push a button which subtracts the weight of your container. This allows you to measure only the weight of the ingredients.
Alternately, you could do a Duck Duck Go search for “How many grams in a cup” but that can be confusing since the mass of the item will cause the weight to vary. Hope this helps.