Convert Imperial Fluid Ounce to US Fluid Ounce
Convert imperial fluid ounces to us fluid ounces instantly. 1 imperial fluid ounce = 0.9607599404 us fluid ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Fluid Ounce 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.
US Fluid Ounce
A US fluid ounce is 1/128 of a US gallon (29.5735 mL).
Derived from the gallon subdivision; distinct from the slightly smaller UK fluid ounce.
Standard for US beverage and nutrition labeling.
English customary; US since 1824.
Imperial Fluid Ounce to US Fluid Ounce conversion formula
The relationship between imperial fluid ounces and us fluid ounces:
To convert imperial fluid ounces to us fluid ounces, multiply the value in imperial fluid ounces by 0.9607599404. To reverse, multiply us fluid ounces by 1.0408427308.
How to use this converter
Type a value into the calculator. The result in us fluid ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Fluid Ounce to Imperial Fluid Ounce converter for the reverse direction.
Step-by-step: convert imperial fluid ounces to us fluid ounces
- Write down the value in imperial fluid ounces (fl oz).
- Multiply that value by the factor 0.9607599404.
- The product is the equivalent value in us fluid ounces (fl oz).
- To reverse, multiply the us fluid ounce value by 1.0408427308.
Worked examples
Example 1 — Convert 1 fl oz to fl oz:
1 × 0.9607599404 = 0.9607599404 fl oz
Example 2 — Convert 100 fl oz to fl oz:
100 × 0.9607599404 = 96.0759940404 fl oz
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 us fluid ounces for direct comparison across supplier datasheets.
70 fl oz × 0.9607599404 = 67.2531958283 fl oz
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 × 0.9607599404 = 2.8822798212 fl oz
Real-world example — Plastic-film thickness alternates
A 150-imperial fluid ounce plastic film converts cleanly to us fluid ounces — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 fl oz × 0.9607599404 = 144.1139910606 fl oz
Imperial Fluid Ounce to US Fluid Ounce conversion table
Standard reference values for converting imperial fluid ounces to us fluid ounces:
| Imperial Fluid Ounce [fl oz] | US Fluid Ounce [fl oz] |
|---|---|
| 0.01 | 0.0096075994 |
| 0.1 | 0.096075994 |
| 1 | 0.9607599404 |
| 2 | 1.9215198808 |
| 3 | 2.8822798212 |
| 4 | 3.8430397616 |
| 5 | 4.803799702 |
| 10 | 9.607599404 |
| 20 | 19.2151988081 |
| 30 | 28.8227982121 |
| 40 | 38.4303976162 |
| 50 | 48.0379970202 |
| 100 | 96.0759940404 |
| 500 | 480.3799702019 |
| 1000 | 960.7599404039 |
Frequently asked questions
How many us fluid ounces is 1 imperial fluid ounce?
How do I convert imperial fluid ounces to us fluid ounces?
How do I convert us fluid ounces back to imperial fluid ounces?
How many us fluid ounces is 100 imperial fluid ounces?
Popular volume unit conversions
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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 = 0.9607599404 fl oz) 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.