Convert Imperial Fluid Ounce to Milliliter
Convert imperial fluid ounces to milliliters instantly. 1 imperial fluid ounce = 28.4130625 milliliter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Milliliter to Imperial Fluid Ounce converter for the reverse conversion.
Units explained
Imperial Fluid Ounce
An imperial fluid ounce is 1/160 of an imperial gallon (28.4131 mL).
Defined so that ten fluid ounces make an imperial half-pint.
Used in UK and Commonwealth recipes and labels.
UK, 1824.
Milliliter
A milliliter is one thousandth of a liter, exactly equal to one cubic centimeter.
Formed with the SI prefix milli- applied to the liter.
The standard small-volume unit in cooking, medicine and the laboratory.
Metric prefix system.
Imperial Fluid Ounce to Milliliter conversion formula
The relationship between imperial fluid ounces and milliliters:
To convert imperial fluid ounces to milliliters, multiply the value in imperial fluid ounces by 28.4130625. To reverse, multiply milliliters by 0.0351950797.
How to use this converter
Type a value into the calculator. The result in milliliters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Milliliter to Imperial Fluid Ounce converter for the reverse direction.
Step-by-step: convert imperial fluid ounces to milliliters
- Write down the value in imperial fluid ounces (fl oz).
- Multiply that value by the factor 28.4130625.
- The product is the equivalent value in milliliters (mL).
- To reverse, multiply the milliliter value by 0.0351950797.
Worked examples
Example 1 — Convert 1 fl oz to mL:
1 × 28.4130625 = 28.4130625 mL
Example 2 — Convert 100 fl oz to mL:
100 × 28.4130625 = 2841.30625 mL
Real-world example — Plastic-film thickness alternates
A 150-imperial fluid ounce plastic film converts cleanly to milliliters — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 fl oz × 28.4130625 = 4261.959375 mL
Real-world example — Hair-width scale measurements
A 70-imperial fluid ounce measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like milliliters for direct comparison across supplier datasheets.
70 fl oz × 28.4130625 = 1988.914375 mL
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 imperial fluid ounces), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 fl oz × 28.4130625 = 85.2391875 mL
Imperial Fluid Ounce to Milliliter conversion table
Standard reference values for converting imperial fluid ounces to milliliters:
| Imperial Fluid Ounce [fl oz] | Milliliter [mL] |
|---|---|
| 0.01 | 0.284130625 |
| 0.1 | 2.84130625 |
| 1 | 28.4130625 |
| 2 | 56.826125 |
| 3 | 85.2391875 |
| 4 | 113.65225 |
| 5 | 142.0653125 |
| 10 | 284.130625 |
| 20 | 568.26125 |
| 30 | 852.391875 |
| 40 | 1136.5225 |
| 50 | 1420.653125 |
| 100 | 2841.30625 |
| 500 | 14206.53125 |
| 1000 | 28413.0625 |
Frequently asked questions
How many milliliters is 1 imperial fluid ounce?
How do I convert imperial fluid ounces to milliliters?
How do I convert milliliters back to imperial fluid ounces?
How many milliliters is 100 imperial fluid ounces?
Popular volume unit conversions
Convert Imperial Fluid Ounce to other volume units
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Metric / SI (8 units)
US Customary (Liquid) (8 units)
Imperial (UK) (3 units)
Cubic (length-derived) (3 units)
Sources & references
Conversion factor (1 fl oz = 28.4130625 mL) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.