When you're trying to convert milliliters, abbreviated mL, to cups, you first need to know how many milliliters are in one cup. There are 240 mL in one U.S. legal cup.

If you want to convert 200 mL to cups, you need to divide 200 by 240. Since you know that you need at least 240 mL to make one cup, you can tell that your 200 mL is going to be less than a full cup.

200 / 240 = 0.8333

This tells you that there are 0.8333 cups in 200 mL.