As simple as it may seem, converting <b>100 grams to cups</b> is not as easy as you may expect. Cups are a volume unit, whereas grams are a mass unit. However, even though there isn't a precise conversion ratio for converting the amount to cups, you can still discover the conversions for the most popular food products below. 3/8 cups of water are equal to 100 grams to cups. Please note that the units of gram and cups cannot be used interchangeably. In order to calculate the correct cup value for 100 gram, you must understand what you are converting.