The imperial fluid ounce is a unit of volume from the imperial measurement system, traditionally used in the United Kingdom and other Commonwealth countries. One imperial fluid ounce is equal to 28.4131 milliliters, which makes it slightly larger than the US fluid ounce (approximately 29.57 mL in the US system). It's commonly abbreviated as fl oz and was widely used for measuring liquids in recipes, packaging, and day-to-day household tasks.
Uses: The imperial fluid ounce was once a standard unit in British kitchens, used to measure ingredients such as milk, oil, and other cooking liquids. While most modern recipes in the UK now use milliliters or grams, many older or traditional recipes still list quantities in fluid ounces. This makes the unit especially relevant for those cooking from classic British cookbooks or following long-standing family recipes.
The imperial fluid ounce still appears on many UK labels, especially for drinks, personal care products, and older medicinal packaging. Whether you're following a traditional recipe or measuring from labeled packaging, knowing how this unit works helps you convert accurately and maintain consistency.
A fluid ounce (US) is a unit of volume used to measure liquids in the U.S. customary system. It's abbreviated as fl oz and is commonly seen in cooking, nutrition labeling, and liquid packaging. One US fluid ounce is defined as 1/128 of a US gallon, which equals exactly 29.5735 milliliters.
Despite the term "ounce" also being used for weight, a fluid ounce specifically measures liquid volume. It's important to distinguish the two, especially in recipes or products where both liquid and solid measurements appear. The US fluid ounce is a standard unit across many industries, from beverages and sauces to cleaning products and personal care items,
Uses: The fluid ounce is widely used in everyday life throughout the United States. In the kitchen, it shows up in recipes for measuring water, milk, oil, and other liquids. You'll also find it on nutrition labels, drink containers, and liquid medicine bottles. Most bottled drinks sold in the U.S., from soda cans to sports drinks, are labeled in fluid ounces.
Outside the kitchen, fluid ounces are also used to measure everyday products like shampoo, lotion, and household cleaners. Packaging labels often list fluid ounces to help shoppers gauge how much liquid is inside each bottle. In pharmacies, you may still see fluid ounces on medication packaging, though many prescriptions now use milliliters for greater accuracy and consistency.
1 fl oz (imp) = 0.960762 fl oz
Let’s say you want to convert 100 fl oz (imp) to fl oz.
Using the formula:
100 × 0.960762 = 96.076 fl oz
So, 100 fl oz (imp) is approximately 96.076 fl oz.
| Fluid Ounce (Imperial) (fl oz (imp)) | Fluid Ounce (US) (fl oz) |
|---|---|
| 1 fl oz (imp) | 0.961 fl oz |
| 2 fl oz (imp) | 1.922 fl oz |
| 3 fl oz (imp) | 2.882 fl oz |
| 4 fl oz (imp) | 3.843 fl oz |
| 5 fl oz (imp) | 4.804 fl oz |
| 6 fl oz (imp) | 5.765 fl oz |
| 7 fl oz (imp) | 6.725 fl oz |
| 8 fl oz (imp) | 7.686 fl oz |
| 9 fl oz (imp) | 8.647 fl oz |
| 10 fl oz (imp) | 9.608 fl oz |
| 11 fl oz (imp) | 10.568 fl oz |
| 12 fl oz (imp) | 11.529 fl oz |
| 13 fl oz (imp) | 12.49 fl oz |
| 14 fl oz (imp) | 13.451 fl oz |
| 15 fl oz (imp) | 14.411 fl oz |