Fluid Ounces to Milliliters Converter - Convert fl oz to mL (US)
Convert with the exact identity mL = fl oz × 29.5735295625. The reverse mapping is fl oz = mL ÷ 29.5735295625. The calculator preserves internal precision and uses scientific notation only for extreme magnitudes to keep results readable.
Exact constant: 1 US fl oz = 29.5735295625 mL. See all volume unit converters.
About Fluid Ounces (US) to Milliliters
US fluid ounces (fl oz) are a common measure for beverages and liquid ingredients in the United States, while milliliters (mL) are the international SI unit used by science, healthcare, and most global food labeling. Converting between them allows recipes, bar programs, nutrition panels, and lab notes to speak a common language without ambiguity. The constant used here is 29.5735295625 mL per US fl oz, it comes from a defined chain that ties US fluid measures to the cubic inch, ensuring reproducibility across manuals, spreadsheets, and regulatory documents.
In everyday practice you will see rounded figures like 29.57 or 30 mL per fl oz for quick estimates. Those are fine for mental checks or menu copy, but when you scale batches or sign off on QA records, use the exact constant and apply rounding only once at the end. This approach keeps intermediate calculations consistent, reduces cumulative rounding drift, and supports clear audit trails in professional environments.
Fluid Ounces to Milliliters Formula
Exact relationship (US customary → SI)
mL = fl oz × 29.5735295625
// inverse
fl oz = mL ÷ 29.5735295625Reference anchors for quick checks:
1 fl oz = 29.5735295625 mL
8 fl oz ≈ 236.5882365 mL (about 1 US cup)
12 fl oz ≈ 354.88235475 mL (common can)
16 fl oz ≈ 473.17647299999997 mL (about 1 US pint)Related Volume Converters
What Are Fluid Ounces and Milliliters?
US Fluid Ounces (fl oz)
The US fluid ounce is a unit of volume for liquids, used in drink menus, bottled beverages, and kitchen measurements. It is connected to the US cup (8 fl oz), tablespoon (2 tbsp per fl oz), and teaspoon (6 tsp per fl oz), forming a practical ladder for culinary work and bar recipes.
Milliliters (mL)
The milliliter is the SI subunit of the liter. It is the preferred unit in scientific documentation, healthcare dosing, product formulation, and international packaging. Reporting in mL improves comparability across regions and aligns with laboratory instruments and regulatory expectations.
Step-by-Step: Converting fl oz to mL
- Enter the quantity in US fluid ounces.
- Multiply by 29.5735295625 to obtain milliliters.
- Round once at presentation to the decimals your audience expects (often 1–2 decimals for consumer contexts).
- Label units clearly in tables and exports; note US to avoid confusion with imperial measures.
Example walkthrough:
Input: 12 fl oz
Compute: mL = 12 × 29.5735295625 = 354.88235475
Output: 354.88235475 mL (≈ 354.88 mL if rounded to 2 decimals)Applications and Context
Beverage menus and packaging
Convert standard US servings (e.g., 12, 16, 20 fl oz) to mL for international labels and nutrition panels. Keep the exact math in your source of truth, and round for the final label.
Recipe development and bar programs
Cocktail specs and syrups often start in fl oz; converting to mL supports jiggers, pour spouts, and metric barware without reauthoring the recipe.
Laboratory and QA workflows
Document precise volume conversions for test batches, retains, and calibration logs. Stating the constant and rounding policy maintains traceability.
Common Conversions (fl oz → mL)
| Fluid Ounces (US) | Milliliters (mL) |
|---|---|
| 1 | 29.5735295625 |
| 2 | 59.147059125 |
| 4 | 118.29411825 |
| 6 | 177.441177375 |
| 8 | 236.5882365 |
| 12 | 354.88235475 |
| 16 | 473.17647299999997 |
| 20 | 591.47059125 |
| 24 | 709.7647095 |
| 32 | 946.3529459999999 |
Quick Reference Table (Reverse: mL → fl oz)
| Milliliters (mL) | Fluid Ounces (US) |
|---|---|
| 30 | 1.01442 |
| 60 | 2.02884 |
| 120 | 4.05768 |
| 240 | 8.11537 |
| 250 | 8.45351 |
| 355 | 12.00394 |
| 473 | 15.98573 |
| 500 | 16.90701 |
| 750 | 25.36052 |
| 1000 | 33.81402 |
Precision, Rounding & Significant Figures
Operational rounding
Keep exact math internally and round once in the final display. Choose decimals based on context: consumer labels often show fewer decimals than lab notebooks.
Consistent documentation
Note the constant (29.5735295625 mL per US fl oz) near examples and in method notes. Identify the unit system (US) to avoid confusion with imperial measures.
Where This Converter Is Used
- Translating US beverage sizes to SI milliliters for international menus and packaging.
- Normalizing bar and kitchen recipes that mix US customary and metric units.
- Scientific and QA records that require exact constants and consistent rounding rules.
- Education materials that explain how US fluid measures relate to SI units.
Frequently Asked Questions
What is the exact formula to convert US fluid ounces to milliliters?
Use mL = fl oz × 29.5735295625. This constant derives exactly from the US definition of the fluid ounce via the cubic inch and is standardized for labeling and scientific use.
How many milliliters are in 1 US fluid ounce?
Exactly 29.5735295625 mL in 1 US fl oz. For quick mental math you can use 29.57 mL as a practical rounded figure, but the tool keeps the exact constant internally.
Is a US fluid ounce the same as an imperial fluid ounce?
No. US and imperial (UK) fluid ounces differ. This converter uses the US fluid ounce (≈29.57 mL). The imperial fluid ounce is ≈28.4130625 mL. Always confirm which system your recipe or label uses.
How should I round when converting fl oz to mL for recipes and labels?
Perform calculations with the exact constant and round once at final display. Common choices are 1 or 2 decimals for consumer labels and 2–3 decimals for technical notes.
Can I convert fluid ounces to milliliters and grams together?
You can convert fl oz → mL using 29.5735295625. To convert volume to grams you must know density. For water at room temperature, mL ≈ grams, but for oils, syrups, or alcohols use the correct density.
How many milliliters are in 12 fl oz (a common beverage size)?
12 × 29.5735295625 = 354.88235475 mL. Many references round this to 355 mL for display on menus and packaging.
Does localization affect the fluid ounces to milliliters conversion?
No. Localization changes how numbers are displayed (decimal symbol and digit grouping) but not the arithmetic or constants.
What are quick anchors for fl oz to mL?
1 fl oz ≈ 29.57 mL, 2 fl oz ≈ 59.15 mL, 8 fl oz ≈ 236.59 mL (about 1 cup), 16 fl oz ≈ 473.18 mL (about 1 US pint).
Is this fl oz to mL mapping linear for batch scaling?
Yes. The relationship is strictly linear. Doubling fluid ounces doubles milliliters. Fractional inputs convert proportionally.
How do I convert fluid ounces to milliliters in spreadsheets?
Multiply the fl oz column by 29.5735295625. Store the constant in a named cell for maintainability and apply rounding only in the presentation layer.
How can I handle very small or very large fluid ounce values?
The calculator switches to scientific notation for extreme magnitudes while keeping exact math internally. Exports remain precise.
Is this conversion suitable for lab records and QA documentation?
Yes. The US fl oz to mL constant is standardized. Include the constant and rounding policy in your methods section for complete traceability.
Tips for Working with fl oz & mL
- Memorize anchors: 8 fl oz ≈ 237 mL; 12 fl oz ≈ 355 mL; 16 fl oz ≈ 473 mL.
- Mark the system: “US” for fluid ounces. Use milliliters for cross-border clarity.
- Round once at the end; keep exact math in source files for reproducibility.
- For mass conversions, multiply volume by density rather than assuming mL = grams.