# fl oz

CEFR B2 · Noun

Source: https://englishreference.com/word/fl-oz
Updated: 2026-07-29

## Definition

Stands for fluid ounce. A unit of measurement used to show how much liquid is in a container, commonly used in the United States.

For teachers: Abbreviation for fluid ounce. A unit of volume or capacity used for liquids in both the US customary and British imperial systems, roughly equivalent to 30 millilitres.

## Examples

- This bottle of water contains 16.9 fl oz.
- The recipe requires exactly 8 fl oz of heavy cream to ensure the sauce reaches the correct consistency.
- Manufacturers are required to list the net quantity of contents in both fl oz and millilitres to satisfy international labelling standards for exported beverages.

## Pitfalls

- Not "fl. ozs." but "fl oz" — Standard abbreviations for units of measurement do not take a plural 's' in professional writing.

## Usage notes

- Commonly used in recipes and product volume labelling. When used as a plural, the abbreviation 'fl oz' usually remains the same rather than adding an 's'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.