Fluid Ounces to ML Converter
The Formula
Common Fluid Ounces to Milliliters Values
| Fluid Ounces | Milliliters | Fraction |
|---|---|---|
| 0.25 | 7.39 | 7⅜ |
| 0.5 | 14.79 | 14¾ |
| 0.75 | 22.18 | 22⅛ |
| 1 | 29.57 | 29⅝ |
| 1.5 | 44.36 | 44⅜ |
| 2 | 59.15 | 59⅛ |
| 3 | 88.72 | 88¾ |
| 4 | 118.30 | 118⅓ |
| 5 | 147.87 | 147⅞ |
| 8 | 236.59 | 236⅝ |
| 10 | 295.74 | 295¾ |
| 12 | 354.89 | 354⅞ |
A Worked Example
A cocktail recipe calls for 2 fluid ounces of a spirit. Multiply 2 by 29.574 to get about 59.1ml, the figure a bartender working from a metric-marked jigger would pour instead.
When This Conversion Matters
A US fluid ounce is 29.57ml, a fixed volume conversion common in drink recipes and liquid measuring.
This differs slightly from the UK fluid ounce, so double-check which standard your recipe follows.
Cocktail and mixology recipes published internationally frequently list pours in milliliters, requiring conversion to fluid ounces for bartenders trained on US jiggers, which are typically marked in 1oz and 1.5oz increments.
Skincare and personal care product sizing in the US is commonly listed in fluid ounces, while European and Asian equivalents use milliliters — a frequent conversion point when comparing product sizes across regions.
US craft distilleries exporting spirits internationally often need to convert their domestic fluid-ounce bottle specifications into milliliter figures to comply with the labeling requirements of importing countries.
Standards and Sources
The US fluid ounce is defined as exactly 1/128 of a US gallon, working out to 29.5735 milliliters under NIST customary-to-metric conversion standards.
The UK (imperial) fluid ounce, at approximately 28.41ml, is about 4% smaller than the US fluid ounce — a subtle but real difference that matters for precise recipe conversion.
US standard drink pours in bartending — 1oz, 1.5oz, and 2oz jiggers — translate to roughly 29.6ml, 44.4ml, and 59.1ml respectively, figures bar recipe books frequently list alongside the ounce measurement.
The Alcohol and Tobacco Tax and Trade Bureau permits US spirits producers to label bottles in either fluid ounces or milliliters, though most major spirits brands have standardized on metric sizing (750ml, 1L) for consistency with international markets.
Where This Unit Comes From
The fluid ounce split into separate US and British definitions after the two countries' measurement systems diverged in the 19th century, while the milliliter remained a single, internationally consistent metric unit throughout.
Where This Shows Up
Cocktail and mixology recipes published internationally frequently list pours in milliliters, requiring conversion to fluid ounces for bartenders trained on US jiggers, typically marked in 1oz and 1.5oz increments.
Skincare and personal care product sizing in the US is commonly listed in fluid ounces, while European and Asian equivalents use milliliters — a frequent conversion point when comparing product sizes across regions.
Homemade tincture and extract recipes shared across international cooking and herbalism communities frequently mix fluid-ounce and milliliter measurements within the same ingredient list, requiring conversion for consistency.
Home aromatherapy and diffuser blending guides frequently list essential oil dilution ratios in fluid ounces of carrier liquid, requiring conversion for recipes sourced from international wellness communities.
Common Mistakes
- Using the UK fluid ounce conversion (28.41ml) for a US recipe, understating the actual volume by about 4%.
- Confusing a fluid ounce with a weight ounce, especially when converting a recipe that mixes both units for different ingredients.
- Rounding 29.574 down to a flat 30 for a batch recipe, introducing small but compounding error at scale.
- Assuming a shot glass or jigger is precisely calibrated without checking, since inexpensive bar tools sometimes vary from the labeled volume by a meaningful margin.
US Fluid Ounce vs UK Fluid Ounce
| US Fluid Ounce | UK Fluid Ounce | |
|---|---|---|
| Volume | 29.57 ml | 28.41 ml |
| Fl oz per US/UK cup | 8 (US cup) | 10 (UK imperial cup) |
| Difference | Baseline | ~4% smaller |
Related Converters
Frequently Asked Questions
How many ml are in a fluid ounce?+
29.57ml, for the US standard fluid ounce.
How many ml are in 8 fl oz?+
About 236.6ml, which is also 1 cup.
Is a UK fluid ounce the same?+
No, a UK fluid ounce is about 28.41ml, slightly smaller than the US version.
How many ml is a standard cocktail jigger pour?+
A standard 1.5oz jigger pour is about 44.4ml, one of the most common bartending measurements in US recipes.
How many ml is a standard US shot of liquor?+
A standard 1.5oz shot converts to about 44.4ml.
Why do bar recipes sometimes list both oz and ml?+
International bar guides often include both to serve bartenders trained on either the US or metric system.
Why do US nutrition labels still use fluid ounces?+
US federal labeling regulations require fluid ounces as the primary volume unit for beverages, with metric figures often included as a secondary reference.