Convert Cups to Fluid Ounces

The Conversion Formula

To convert cups to fluid ounces, multiply the value by the conversion factor: 1 cup = 8 fl oz. For a worked example, suppose you need to convert 25 cup to fluid ounces: 25 × 8 = 200 fl oz. To convert in the opposite direction, divide by 8, or equivalently multiply by 0.125.

About cups

The measuring cup is the backbone of US home cooking. Standardized by Fannie Farmer in the 1890s to replace vague instructions like 'a tea-cup full,' the US Customary Cup is exactly 8 US fluid ounces. Note that the 'Metric Cup' used in Australia, Canada, and New Zealand is 250 mL, slightly larger than the US cup (approx. 237 mL). Baking with the wrong cup type can lead to recipe failures! cups are commonly used in Baking recipes (flour, sugar), Rice cooker measures, Coffee maker water reservoirs, and Liquid measuring cups.

A standard coffee mug is roughly 1.5 cups.

About fluid ounces

The fluid ounce (fl oz) is a volume unit, not to be confused with the ounce (oz) of weight. In the US system, 8 fluid ounces make a cup, and 16 fluid ounces make a pint. It is the standard unit for beverage labeling in the US. Interestingly, a US fluid ounce of water weighs slightly more than one ounce by weight (approx. 1.04 oz), whereas in the Imperial system, 1 fl oz of water weighs exactly 1 oz. fluid ounces are commonly used in Soda cans (12 fl oz), Perfume bottles, Shampoo and lotion, and Bar measurements (shots), Medicine liquids.

A standard soda can contains 12 fluid ounces.

When Would You Convert cups to fluid ounces?

Converting between cups and fluid ounces is one of the most common volume conversions. You might need this conversion when working with international specifications, following instructions written for a different measurement system, or comparing values across different standards. Having the conversion factor (1 cup = 8 fl oz) memorized or bookmarked can save time in professional and everyday contexts alike.