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What the Fluid Ounce Converter does
Fluid Ounce Converter: 1 fl oz = 29.57352956 mL, so multiply a fluid ounce (US) value by 29.57352956 to get millilitre, or divide to go back. Example: 1 fl oz = 29.57352956 mL.
Result, How it was calculated and Reverse conversion, derived from Value, From and To. Results refresh instantly, so trying variations costs nothing but a moment.
Having the exact factor matters more than a rough mental estimate. That is usually what brings anyone working across two measurement systems here.
This runs client-side, which means we never receive what you enter and could not retrieve it if asked.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the Fluid Ounce Converter fields mean?
The Fluid Ounce Converter uses 3 inputs. A complete set of starting values is loaded for you, so nothing is required before the first result appears.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³) | Fluid ounce (US) (fl oz) |
| To | choose from Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³) | Millilitre (mL) |
How does the Fluid Ounce Converter work?
Both units are converted through volume's base unit (L), so any of the 19 units in the dropdowns can be paired in either direction without loss of accuracy.
Factors follow the internationally agreed definitions. The inch has been exactly 25.4 mm since 1959, and an exact definition is used wherever one exists. Where a unit is fixed by measurement rather than by agreement, the accepted CODATA or IAU value is used.
Worked example
These are the values the Fluid Ounce Converter loads by default, and the result it produces from them. This walkthrough uses the starting values, which means you can follow along without typing anything.
| Value | 1 |
|---|---|
| From | Fluid ounce (US) (fl oz) |
| To | Millilitre (mL) |
| Result | 29.57352956 mL |
|---|---|
| How it was calculated | 1 fl oz = 29.57352956 mL, so 1 × 29.57352956 = 29.57352956 mL |
| Reverse conversion | 0.033814023 fl oz (if you meant 1 mL) |
US and imperial fluid ounces
The US fluid ounce (29.5735295625 mL) and the UK imperial fluid ounce (28.4130625 mL) differ by about 4%: a smaller gap than the gallon/pint/quart split, but still enough to matter for precise recipes or lab measurements.
Worth knowing
- The "8 fluid ounces = 1 cup" relationship is specifically a US convention; the UK does not standardise cooking measurement around cups or fluid ounces the way the US does, generally preferring metric weight instead.
- Because both the ounce’s size and the number of ounces per pint/quart/gallon differ between the US and imperial systems, a "16 fl oz" US pint and a "20 fl oz" UK pint describe genuinely different volumes in two different ways: the unit size and the count both changed.
- Spirits and beverage servings quoted in fluid ounces (a "1.5 oz shot," for instance) implicitly assume the US fluid ounce in US contexts, worth checking when comparing pour sizes internationally.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Fill in Value.
- Pick a value for From: the options are Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³).
- Pick a value for To: the options are Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³).
- Type a value and the answer is already there by the time you stop.
- The panel reports Result, How it was calculated and Reverse conversion.
- Share the link rather than a screenshot. It carries the values with it.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where possible.
- Factors use the internationally agreed definitions; some industries round them differently.
- The output is a number, not a judgement. Deciding what it means is still your job.
- The tool cannot tell whether a number was entered in the unit you intended, so double-check the labels.
Frequently asked questions
Only Value, From and To. Each field is pre-filled with a sensible default, letting you treat it as a what-if tool rather than a data-entry form.
With the values loaded when the page opens, result comes out as 29.57352956 mL. Change a value and the number is recomputed on the spot.
Nothing leaves your machine. The only network traffic is loading the page itself.
It is free to use, with no premium tier holding back the useful parts.
It matches what you would get working it out by hand, with fewer opportunities to slip.