Navigate to an online conversion tool. Enter the number of milligrams you wish to convert into the corresponding box, and the value in ounces will automatically be generated. Use the same procedure to obtain the value from ounces to U.S. cups.
Multiply the value in milligrams by 0.0000352. This will help obtain an accurate estimation of the value in ounces. From here, you can perform another multiplication, this time by 0.125, to obtain the value in U.S. cups.
Use a conversion table and find the appropriate line for the first conversion of grams to ounces. You will need to divide the number of milligrams by 1000 to obtain the corresponding value in grams. Finally, you can use the same table to search for the fluid ounce to cup conversion.