Given the formula number of ounces. To convert 18 cups into fluid ounces we have to multiply 18 by the conversion factor in order to get the volume amount from cups to fluid ounces. Apple Red 18oz Plastic Cups 50ct In 2022 Party Packs Plastic Party Cups Party Kit To convert cups to ounces multiply the cup value by 8. . 1 cup 8 fl oz. To transform fluid ounce to cups multiply the fluid oz unit by 0125 or divide by 8. 18 ounces equal how many cups. Use the calculator above to convert between ounces and cups. Convert to tbsp oz cups ml liters quarts pints gallons etc. There are 3 teaspoons is 1 tablespoon and 8 ounces in 1 cup that means 16 ounces of water is equal to 2 cups which is 1 pint and 32 ounces is equal to 4 cups which is 2 pints and 1 quart. 18 ounces to pints. If youre wanting weight conversions for dry ounces instead youll find a chart and information further down the page. 18 ounces to gallons.