Two-thirds of a cup equals 5.28 ounces. Measuring liquid by ounce can be challenging, and this has prompted standard measuring devices to be pre-marked with designated amounts. However, understanding the conversion rate allows one to better estimate how much a given product supplies when looking at its content amount.
Liquid products are normally packaged by the fluid ounce, which is not the same as a solid ounce. A fluid ounce of honey weighs more than a fluid ounce of water. Liquids are measured by volume as opposed to weight, and this is important to keep in mind for recipes that require a certain weight of an ingredient.