Imperial Ounces to Milliliters Converter - Convert UK fl oz to mL Instantly
Convert Imperial (UK) fluid ounces (fl oz) to milliliters (mL) quickly and accurately with this easy-to-use volume converter. Ideal for brewing, beverages, recipes, lab work, and any application where UK fluid ounces must be converted to metric.
Note: This tool converts Imperial (UK) fluid ounces to milliliters. For US fluid ounces, use the dedicated US fl oz to mL converter.
About Ounces (UK) to Milliliters Conversion
Imperial (UK) fluid ounces (fl oz) and milliliters (mL) both measure volume. The UK fluid ounce belongs to the Imperial system and is still referenced in brewing literature, historical recipes, and certain regional documentation. The milliliter is part of the SI (metric) system and appears on modern packaging, lab instruments, and medical devices. Converting UK fl oz to mL ensures your volumes are precise and compatible with global standards.
The relationship is defined exactly: 1 UK fl oz = 28.4130625 mL. Multiplying UK fl oz by this factor produces a reproducible milliliter value suitable for technical notes, audit trails, and engineering calculations—yet it’s still simple enough for everyday kitchen and beverage tasks.
Conversion Formula
Use the direct factor method:
mL = UK fl oz × 28.4130625Example:
12 UK fl oz = 12 × 28.4130625 = 340.95675 mL
To convert in the opposite direction:
UK fl oz = mL ÷ 28.4130625.
UK vs US Fluid Ounces
The UK (Imperial) fluid ounce and the US fluid ounce are not identical. A UK fl oz equals 28.4130625 mL, while a US fl oz equals 29.5735295625 mL. Using the wrong ounce standard can introduce errors in recipes, dosing, and packaging. This page converts UK fl oz to mL. If your source uses US fl oz, switch to the US-specific converter to avoid mix-ups.
Why Convert UK fl oz to mL?
- 🍺 Brewing: Translate Imperial recipe volumes into precise metric measurements.
- 🥤 Beverage packaging: Prepare labels and QA checks for metric-only markets.
- 📜 Historical recipes: Update older UK recipes to modern mL units.
- 🧪 Lab & medical: Align Imperial documentation with metric instruments and SOPs.
- 🏠 Everyday cooking: Convert UK cookbook measurements to mL for modern tools.
Common Conversions
- 1 UK fl oz = 28.41306 mL
- 2 UK fl oz = 56.82613 mL
- 4 UK fl oz = 113.65225 mL
- 8 UK fl oz = 227.30450 mL
- 12 UK fl oz = 340.95675 mL
- 16 UK fl oz = 454.60900 mL
- 32 UK fl oz = 909.21800 mL
What is a UK Fluid Ounce?
A UK fluid ounce is an Imperial unit of liquid volume. It is exactly 1/160 of an Imperial gallon (4.54609 L), which is why one UK fl oz equals 28.4130625 mL. You’ll encounter UK fl oz in brewing references, maritime documentation, and historical cookbooks.
What is a Milliliter?
A milliliter (mL) is one-thousandth of a liter and is ubiquitous on packaging, lab glassware, and medical devices. It pairs naturally with teaspoons (5 mL) and tablespoons (15 mL) and scales up neatly to liters (L) for larger quantities.
Step-by-Step: Converting UK fl oz to mL
- Write down your volume in UK fluid ounces.
- Multiply by 28.4130625.
- Express the result in mL (milliliters).
Example walkthrough:
Input: 9.5 UK fl oz
Multiply: 9.5 × 28.4130625 = 269.92409
Output: 269.92409 mLPrecision, Rounding & Significant Figures
For everyday cooking and beverages, 2–3 decimals are often enough. This tool defaults to 5 decimals for high precision. In technical contexts, match significant figures to your measuring instruments and reporting standards to minimize rounding error when chaining calculations.
Use Cases of UK fl oz → mL
- 🍻 Scaling British brewing recipes to metric systems
- 🧃 Converting UK-labeled beverage sizes for international distribution
- 📜 Modernizing historical Imperial recipes for today’s kitchens
- 🧫 Preparing lab solutions when documentation cites UK fl oz
- 🏷️ Creating metric-compliant labels and QA specifications
Quick Reference Table
| Ounces (UK fl oz) | Milliliters (mL) |
|---|---|
| 1 | 28.41306 |
| 2 | 56.82613 |
| 4 | 113.65225 |
| 8 | 227.30450 |
| 12 | 340.95675 |
| 16 | 454.60900 |
| 32 | 909.21800 |
Frequently Asked Questions
How do you convert Imperial (UK) fluid ounces to milliliters?
Use the formula: milliliters = UK fluid ounces × 28.4130625. One Imperial (UK) fl oz equals exactly 28.4130625 mL.
How many milliliters are in 1 UK fluid ounce?
1 UK fl oz is exactly 28.4130625 mL. A convenient rounded value is 28.413 mL.
Is a UK fluid ounce the same as a US fluid ounce?
No. A UK fl oz is 28.4130625 mL, while a US fl oz is 29.5735295625 mL. This page converts UK fl oz to mL.
How do I convert milliliters back to UK fluid ounces?
Divide by the same factor: UK fl oz = mL ÷ 28.4130625. For example, 500 mL ÷ 28.4130625 ≈ 17.5975 UK fl oz.
When should I use UK fl oz instead of US fl oz?
Use UK fl oz for Imperial/UK contexts such as certain brewing references, historical recipes, or documentation that explicitly specifies Imperial units.
Tips for Accurate Volume Conversion
- Always verify whether a recipe uses UK or US fluid ounces.
- Use graduated cylinders, syringes, or measuring jugs to reduce parallax error.
- Include the exact factor (28.4130625) in technical notes for reproducibility.