Fluid Ounces to Milliliters Converter
Enter the volume in fluid ounces below to convert it to milliliters.
Convert Fluid Ounces (UK) to Milliliters
Enter a value in fluid ounces (uk) (fl oz (UK)) to convert to milliliters (mL).
Fluid Ounce to Milliliter Conversion Table
Table showing various fluid ounce measurements converted to milliliters. Click any preset value or arrow to load it into the converter.
| Fluid Ounces (UK) (fl oz (UK)) | Milliliters (mL) |
|---|---|
| 1 fl oz (UK) | 28.4130625 mL |
| 2 fl oz (UK) | 56.826125 mL |
| 5 fl oz (UK) | 142.0653125 mL |
| 10 fl oz (UK) | 284.130625 mL |
| 15 fl oz (UK) | 426.1959375 mL |
| 20 fl oz (UK) | 568.26125 mL |
| 25 fl oz (UK) | 710.3265625 mL |
| 30 fl oz (UK) | 852.391875 mL |
| 40 fl oz (UK) | 1,136.5225 mL |
| 50 fl oz (UK) | 1,420.653125 mL |
How to Convert Fluid Ounces to Milliliters
To convert fluid ounces to milliliters, multiply the volume by the following conversion ratio: 28.4130625 milliliters/fluid ounce.
Since one fluid ounce is equal to 28.4130625 milliliters, you can use this simple formula to convert:
The volume in milliliters is equal to the volume in fluid ounces multiplied by 28.4130625.
For example, here's how to convert 20 fluid ounces to milliliters using the formula above.
How Many Milliliters Are in a Fluid Ounce?
There are 28.4130625 milliliters in a fluid ounce, which is why we use this value in the formula above.
Our fluid ounce to milliliter calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Fluid Ounces and milliliters are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Fluid Ounce?
A fluid ounce is a unit of volume equal to 0.0284131 liters (L), the base unit for volume. 1/160 of a UK Imperial gallon (28.4131 mL). [1]
The fluid ounce is classified as a US customary and imperial unit of volume. Fluid Ounces can be abbreviated as fl oz (UK); for example, 1 fluid ounce can be written as 1 fl oz (UK).
When working with fluid ounces (fl oz (UK)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, fluid ounces (fl oz (UK)) are widely used across standard volume applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Milliliter?
A milliliter is a unit of volume equal to 1/1,000 of a liter (0.001 L). One-thousandth of a liter, identical to 1 cubic centimeter (cc). [2]
The milliliter is classified as a metric and SI-compatible unit of volume. Milliliters can be abbreviated as mL; for example, 1 milliliter can be written as 1 mL.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliliter (mL) a convenient decimal multiple of the liter (L).
In practice, milliliters (mL) are widely used across fine-tolerance laboratory, analytical, and micro-scale volume measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting volume between fluid ounces (fl oz (UK)) and milliliters (mL), keep full floating-point precision (1 fl oz (UK) = 28.4130625 mL; 1 mL = 0.0351951 fl oz (UK)) during intermediate calculations and round only the final milliliter figure to match your instrument tolerance.
More Imperial Fluid Ounce & Milliliter Conversions
Need to calculate in the opposite direction? Use our milliliters to fluid ounces (uk) converter (mL to fl oz (UK)) to switch your starting unit immediately. You can also explore related tools such as converting fluid ounces (us) to milliliters, converting cups (us) to milliliters, or converting fluid ounces (uk) to fluid ounces (us).
Convert from Imperial Fluid Ounces
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Fluid Ounces (UK) (fl oz (UK)) to Milliliters (mL)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Fluid Ounce (UK Imperial) (fl oz (UK)) & Milliliter (mL)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (fl oz (UK) to mL)