Fluid Ounces to Milliliters
Convert fluid ounces (fl oz) to milliliters (mL). Both measure capacity and volume, and the conversion comes up in cooking, chemistry, fuel work.
The Formula
``
milliliters = fluid ounces × 29.5735295625
fluid ounces = milliliters × 0.0338140227018
`
One fluid ounce is 29.5735 milliliters, and one milliliter is 0.033814 fluid ounces.
Conversion Table
| Fluid Ounces | Milliliters |
|---|---|
| 1 fl oz | 29.5735 mL |
| 2 fl oz | 59.1471 mL |
| 5 fl oz | 147.8676 mL |
| 10 fl oz | 295.7353 mL |
| 25 fl oz | 739.3382 mL |
| 50 fl oz | 1,478.68 mL |
| 100 fl oz | 2,957.35 mL |
| 500 fl oz | 14,786.76 mL |
| 1,000 fl oz | 29,573.53 mL |
The Other Direction
| Milliliters | Fluid Ounces |
|---|---|
| 1 mL | 0.033814 fl oz |
| 2 mL | 0.067628 fl oz |
| 5 mL | 0.16907 fl oz |
| 10 mL | 0.33814 fl oz |
| 25 mL | 0.845351 fl oz |
| 50 mL | 1.6907 fl oz |
| 100 mL | 3.3814 fl oz |
| 500 mL | 16.907 fl oz |
| 1,000 mL | 33.814 fl oz |
What Each Unit Is
Fluid Ounces (fl oz) — the US fluid ounce: exactly 29.5735295625 millilitres. One sixteenth of a US pint, descended from the wine gallon.
Milliliters (mL) — one thousandth of a litre, equal to one cubic centimetre. The metric unit for small volumes; medicine and cooking both work in millilitres.
A Sense of Scale
A shot is 1.5 fl oz- A soda can is 12 fl oz
- A US coffee cup is 8 fl oz
- A teaspoon is 5 mL
- An espresso is 30 mL
- A wine glass pour is 150 mL
Doing It in Your Head
Multiply by 29. That is off by 1.94% — close enough to judge a
distance, a weight or a price, and not close enough to sign off on a drawing.
Exact Mental shortcut 295.7353 mL 290 mL 2,957.35 mL 2,900 mL
Precision
The factor 29.5735295625 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- A UK fluid ounce is 28.41 mL — close enough to confuse, far enough to ruin a cocktail.
In Code
`javascript
const fluidOunceToMilliliter = (value) => value * 29.5735295625;
``
Where This Conversion Comes Up
- Cooking
- Chemistry
- Fuel
- Beverages
- Medicine
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 fl oz with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 fl oz becomes | Error |
|---|---|---|---|
| 0 | 30 | 4,110 | 1.4421% |
| 1 | 29.6 | 4,055.2 | 0.0895% |
| 2 | 29.57 | 4,051.09 | 0.0119% |
| 3 | 29.574 | 4,051.64 | 0.0016% |
| 4 | 29.5735 | 4,051.57 | — |
The right number of significant figures is set by your input, not by the converter. If you measured fluid ounces to three significant figures, the answer in milliliters is only good to three — writing more digits claims precision the measurement never had.