How many cups do i need to make 238 grams of miralax?

To convert grams to cups, you need to know the density of the substance. In the case of Miralax, the density is approximately 1.5 grams per milliliter. Since there are roughly 236.6 milliliters in a cup, you would need about 1.6 cups of Miralax to make 238 grams.