To convert US fluid ounces to milliliters, multiply by 29.5735. 1 fl oz is 29.57 mL, a 12 fl oz can is 354.9 mL (labeled 355 mL), and 16.9 fl oz is a 500 mL bottle.
US drinks, cosmetics and baby bottles use fluid ounces. Labels in most other places use mL, so this is the conversion for comparing sizes or measuring with a metric jug.
How to use the ounces to ml converter (fl oz to ml)
- Type the value in fluid ounces into the box. Decimals are fine.
- The result in milliliters updates as you type, along with the working.
- Need the other way? Switch the direction menu, or open the ml to ounces converter (ml to fl oz).
Formula
A US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 mL. The UK imperial fluid ounce is smaller, 28.4130625 mL. US nutrition labels round to 30 mL.
Worked example
How many mL are in a 12 fl oz soda can?
- 12 × 29.5735295625 = 354.88.
- Result: 354.9 mL, which is why cans are labeled 355 mL.
Fluid ounces to milliliters chart
Common values, rounded to 2 decimal places.
| Fluid ounces (fl oz) | Milliliters (mL) |
|---|---|
| 0.5 fl oz | 14.79 mL |
| 1 fl oz | 29.57 mL |
| 1.5 fl oz | 44.36 mL |
| 2 fl oz | 59.15 mL |
| 3 fl oz | 88.72 mL |
| 4 fl oz | 118.29 mL |
| 6 fl oz | 177.44 mL |
| 8 fl oz | 236.59 mL |
| 10 fl oz | 295.74 mL |
| 12 fl oz | 354.88 mL |
| 16 fl oz | 473.18 mL |
| 16.9 fl oz | 499.79 mL |
| 20 fl oz | 591.47 mL |
| 24 fl oz | 709.76 mL |
| 32 fl oz | 946.35 mL |
| 64 fl oz | 1,892.71 mL |
| 128 fl oz | 3,785.41 mL |
Fluid ounces in daily life
- Drinks: 8 fl oz cup (236.6 mL), 12 fl oz can, 16.9 fl oz water bottle (500 mL), 20 fl oz soda bottle (591 mL).
- Bar measures: a 1.5 fl oz US shot is 44.4 mL.
- Baby bottles: marked in both fl oz and mL; 4 fl oz is 118 mL.
- UK pints: a British pint is 20 imperial fl oz (568 mL), while a US pint is 16 US fl oz (473 mL).
Quick mental math
Multiply by 30 and take off a little (1.4%). 8 fl oz × 30 = 240, minus 3 ≈ 237 mL.
Related conversions
Going the other way: ml to ounces converter (ml to fl oz). Related pages: cups to ml converter, ml to cups converter, tablespoons to teaspoons converter. For other units in the same family, use the full volume converter or the cooking measurement converter.
Caveats and assumptions
- These are US fluid ounces (volume). For weight ounces, use ounces to grams converter.
- Results show up to 10 significant digits; the chart is rounded for reading. Keep full precision for engineering, medical or legal work.
Frequently asked questions
How many mL are in an ounce?
A US fluid ounce is 29.5735 mL; an imperial fluid ounce is 28.4131 mL. Labels often round to 30 mL.
How many mL is 8 oz?
236.6 mL (one US cup).
How many mL is 16 oz?
473.2 mL (one US pint).
Is an ounce of liquid the same as an ounce of weight?
No. Fluid ounces measure volume and ounces measure weight. 1 fl oz of water weighs about 1.04 oz (29.6 g).
Sources
- NIST — SI Units: Volume — liter, US gallon and fluid ounce
- eCFR 21 CFR 101.9 — Nutrition labeling of food — label conventions: 1 cup = 240 mL, 1 fl oz = 30 mL, 1 tbsp = 15 mL, 1 tsp = 5 mL
- UK Weights and Measures Act 1985, Schedule 1 — defines the stone (14 lb), imperial gallon and imperial fluid ounce
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