Fluid Ounces to Milliliters Converter
A nurse on a pediatric ward drawing up an antibiotic suspension for a child reads the prescription as 1.5 fluid ounces twice daily and converts to 44.36 mL on the syringe so the dosing matches the volumetric calibration of the metric oral syringe in her hand. Fluid-ounces-to-milliliters is the conversion that runs through American pediatric pharmacy (where prescribed doses sometimes appear in fl oz but the dispensing equipment is metric), restaurant beverage portion control (a 12 oz draft beer is 354.88 mL, the figure printed on the keg-tap calibration sheet), gas pump small-volume calibrations, and hand-loaded ammunition where powder volumes for older recipes are sometimes given in fluid ounces but modern reloading equipment dispenses by milliliter or grain weight.
Calculator
1 × 29.5735296 = 29.5735
Formula
Multiply US fluid ounces by 29.5735296 to get milliliters. The factor descends from the US gallon definition (231 cubic inches, which equals 3785.41 mL) divided by 128 (the number of US fluid ounces in a US gallon). For mental math the rough rule is one fl oz equals about 30 mL — accurate to within 1.5 percent which is fine for kitchen and informal use. The UK Imperial fluid ounce equals 28.413 mL and is a different unit; this calculator uses the US fluid ounce. Power users memorize that 1 fl oz equals 29.57 mL, 8 fl oz equals 236.6 mL (one US cup), 12 fl oz equals 354.9 mL (a standard American beer can), and 16 fl oz equals 473.2 mL (one US pint).
Where You'll Use This
American beverage and craft cocktail recipe scaling drives one of the largest fl oz-to-mL conversion volumes in the consumer space. Cocktail recipes published in the United States use fluid ounces (1.5 fl oz of base spirit, 0.75 fl oz of citrus, 0.5 fl oz of syrup) but bartenders working with metric jiggers convert to milliliters to set the pour. Pediatric pharmacy where prescribed doses occasionally appear in fl oz and the dispensing oral syringe is metric requires conversion at every fill. Restaurant beverage portion control uses the conversion when American draft-beer pours (12 fl oz pints, 16 fl oz tall pours) need to verify against the keg's metric volume tracking. Imported American foodstuffs sold in international markets translate fl oz package-fill claims to mL for compliance with EU and other metric labeling jurisdictions. Even the volume of an American shot glass (1.5 fl oz typical) translates to the European 44 mL standard pour for international bartender training programs.
Reference Table
| From (Fluid Ounces) | To (Milliliters) |
|---|---|
| 0.25 | 7.3934 |
| 0.5 | 14.7868 |
| 0.75 | 22.1801 |
| 1 | 29.5735 |
| 1.5 | 44.3603 |
| 2 | 59.1471 |
| 3 | 88.7206 |
| 4 | 118.2941 |
| 5 | 147.8676 |
| 6 | 177.4412 |
| 8 | 236.5882 |
| 10 | 295.7353 |
| 12 | 354.8824 |
| 14 | 414.0294 |
| 16 | 473.1765 |
| 20 | 591.4706 |
| 24 | 709.7647 |
| 32 | 946.353 |
| 40 | 1182.9412 |
| 50 | 1478.6765 |
| 64 | 1892.7059 |
| 75 | 2218.0147 |
| 100 | 2957.353 |
| 128 | 3785.4118 |
| 200 | 5914.706 |
A Bit of History
The US fluid ounce was pinned to its current 29.5735 mL value through the cascading definitions of the gallon and the inch. Congress fixed the US gallon at 231 cubic inches in 1832 (adopting the older British wine gallon rather than the new 1824 Imperial gallon), and one-128th of that gallon defined the US fluid ounce. The 1959 international inch standardization at 25.4 mm exactly translated the 231-cubic-inch gallon into 3785.411784 mL exactly, which divided by 128 gives the current US fluid ounce value. Pharmacy and bartending in the United States retained the fluid ounce as the working unit through the twentieth century because precision metric dispensing equipment was expensive and the fluid ounce was already woven into recipe cards and dose tables that staff had memorized.
FAQ
How many ml is 8 fl oz?
Eight US fluid ounces equals 236.59 mL — exactly one US cup. This is the most useful kitchen-conversion benchmark and the figure that appears on the back of nearly every American measuring cup.
Is 1 fl oz the same as 30 ml?
Approximately — 1 US fl oz equals 29.5735 mL, which most labels round to 30 mL. The 1.4 percent difference matters for pharmaceutical dosing but not for cocktails or cooking.
How do I convert fl oz to ml for cocktails?
Multiply by 29.57. A standard 1.5 fl oz cocktail jigger holds 44.36 mL — the European pour size that international bartender training programs teach as the equivalent of the American 1.5-ounce shot.
What is 12 fl oz in ml?
Twelve US fluid ounces equals 354.88 mL — the standard American beverage can and bottle size. International export versions of the same drinks often switch to 355 mL or the slightly smaller 330 mL European can.