Cooking measurement conversion changes an amount in a recipe from one unit to another, such as cups to milliliters or cups to grams. A cup, a tablespoon, and a teaspoon measure volume, and a gram measures weight, so the grams in a cup depend on the ingredient.
The size of a cup also depends on the country. A Korean measuring cup is 200 ml. A US cup is 8 US fluid ounces, 236.588 ml, and is often rounded to 240 ml.