An official measurement of 1 cup in the United States is 8 ounces. But a cup of tea may only be 6 ounces in Great Britain. You have to be careful when using the word cup or glass. For instance, many people ask me things about glasses of wine. A wine glass might actually hold 8 ounces of liquid, but a glass of wine is only 4 ounces of wine in a glass and not any glass that's filled to the rim. In the U.S., 8 ounces is a cup, 2 cups are a pint, 2 pints are a quart, and 4 quarts are a gallon.
HOW MANY OUNCES IN A CUP
1 cup = 8 fluid ounces, 16 tablespoons
¾ cup = 6 fluid ounces, 12 tablespoons
½ cup = 4 fluid ounces, 8 tablespoons
¼ cup = 2 fluid ounces, 4 tablespoons
1 cup = 4.5 dry weight ounces (dry weight is measuring flour and dry ingredients)
US STANDARD = METRIC (approximate)
Eight ounces is equivalent to 1 cup. That means 1 ounce is equal to 0.125 cups.
You might naturally assume that 1 cup equals 8 ounces of weight, but it’s not true for most ingredients. A cup can hold either more or less fluid, depending on what you fill them with.
⅛ teaspoon = 0.5 mL
¼ teaspoon = 1.2 mL
½ teaspoon = 2.5 mL
¾ teaspoon = 3.7 mL
1 teaspoon = ⅓ tablespoon = 5 mL
1 tablespoon = ½ fluid ounce = 3 teaspoons = 15 mL, 15 cc
2 tablespoons = 1 fluid ounce = ⅛ cup, 6 teaspoons = 30 mL, 30 cc
¼ cup = 2 fluid ounces = 4 tablespoons = 59 mL
⅓ cup = 2 ⅔ fluid ounces = 5 tablespoons + 1 teaspoon = 79 mL
½ cup = 4 fluid ounces = 8 tablespoons = 118 mL
⅔ cup = 5 ⅓ fluid ounces = 10 tablespoons + 2 teaspoons = 158 mL
¾ cup = 6 fluid ounces = 12 tablespoons = 177 mL
1 cup = 8 fluid ounces = ½ pint = 16 tablespoons = 237 mL
1 ½ cups = 12 fluid ounces = 24 tablespoons = 355 mL
2 cups = 16 fluid ounces = 1 pint = 32 tablespoons = 473 mL
3 cups = 700 mL
4 cups = 32 fluid ounces = 1 quart = 946 ml = 1 L
8 cups = ½ gallon = 2 L
1 gallon = 128 fluid ounces = 8 pints = 4 quarts = 3785 ml = 4 L