Ounces to Milliliters Converter - Convert fl oz to mL Instantly
Convert US fluid ounces (fl oz) to milliliters (mL) quickly and accurately with this easy-to-use volume converter. Ideal for cooking, beverages, baby bottles, lab work, and any application requiring precise liquid measurements.
Note: This tool converts US fluid ounces to milliliters. For Imperial (UK) fluid ounces, use the dedicated UK fl oz to mL converter.
About Ounces to Milliliters Conversion
US fluid ounces (fl oz) and milliliters (mL) are both measures of volume. You’ll find fluid ounces on US recipes, drink sizes, and nutrition labels, while milliliters are standard on beverage packaging, medical syringes, and laboratory glassware around the world. Converting between the two lets you follow recipes from different regions, check infant bottle volumes, document lab protocols, or align QA specs across markets.
The conversion is tied to an exact constant: 1 US fluid ounce = 29.5735295625 mL. Multiplying ounces by this factor produces a precise, reproducible milliliter value suitable for technical documentation, audits, and engineering calculations—while still being convenient for everyday tasks in the kitchen or behind the bar.
Ounces to Milliliters Formula
Use the direct factor method:
mL = US fl oz × 29.5735295625Example:
12 US fl oz = 12 × 29.5735295625 = 354.88235 mL
To convert in the opposite direction:
US fl oz = mL ÷ 29.5735295625.
US vs Imperial (UK) Fluid Ounces
The US fluid ounce and the Imperial (UK) fluid ounce are not identical. One UK fl oz equals 28.4130625 mL, which is slightly smaller than the US fl oz (29.5735295625 mL). This page converts US fl oz to mL. If your source uses UK fl oz, use the UK-specific converter to avoid accumulating errors in recipes, dosing, or packaging.
Why Convert fl oz to mL?
- 🍳 Cooking & baking: Follow international recipes and scale them confidently.
- 🍹 Bartending: Standardize pours and tasting flights documented in US fl oz.
- 🍼 Baby feeding: Compare bottle markings and feeding guidelines in mL.
- 🧪 Lab & medical: Align US documentation with metric instruments and SOPs.
- 🥤 Beverage packaging: Validate fill volumes and labels for global distribution.
Common Conversions
- 1 US fl oz = 29.57353 mL
- 2 US fl oz = 59.14706 mL
- 4 US fl oz = 118.29412 mL
- 8 US fl oz = 236.58824 mL
- 12 US fl oz = 354.88235 mL
- 16 US fl oz = 473.17647 mL
- 32 US fl oz = 946.35295 mL
What is a US Fluid Ounce?
A US fluid ounce is a unit of liquid volume in the US customary system. It is exactly 1/128 of a US gallon and equals 29.5735295625 mL. Fluid ounces appear on nutrition facts, drink sizes, and US-focused recipes and bartending guides.
What is a Milliliter?
A milliliter (mL) is one-thousandth of a liter and is a core SI unit for small liquid volumes. It pairs neatly with teaspoons (5 mL) and tablespoons (15 mL) and scales up naturally to liters (L) for larger quantities in kitchens, pharmacies, hospitals, and laboratories.
Step-by-Step: Converting US fl oz to mL
- Write down your volume in US fluid ounces.
- Multiply by 29.5735295625.
- Express the result in mL (milliliters).
Example walkthrough:
Input: 9.5 US fl oz
Multiply: 9.5 × 29.5735295625 = 280.94853
Output: 280.94853 mL
Precision, Rounding & Significant Figures
For everyday use, 2–3 decimals are often enough, but this tool defaults to 5 for high precision. In technical contexts, keep significant figures consistent with your instruments and reporting standards to prevent rounding bias in chained calculations.
Use Cases of fl oz → mL
- 🥣 Translating US cookbook measurements into metric kitchens
- 🍸 Converting bar recipes and flight pours to mL for global menus
- 🍼 Checking infant bottle volumes and tracking daily intake
- 🧫 Preparing solutions and reagents for SOPs recorded in metric
- 🧃 Auditing fill volumes and QA checks on packaging lines
Quick Reference Table
| Ounces (US fl oz) | Milliliters (mL) |
|---|---|
| 1 | 29.57353 |
| 2 | 59.14706 |
| 4 | 118.29412 |
| 8 | 236.58824 |
| 12 | 354.88235 |
| 16 | 473.17647 |
| 32 | 946.35295 |
Frequently Asked Questions
How do you convert ounces to milliliters?
Use the formula: milliliters = US fluid ounces × 29.5735295625. One US fluid ounce equals exactly 29.5735295625 mL.
How many milliliters are in 1 ounce?
1 US fluid ounce is exactly 29.5735295625 mL. A handy rounded value for quick estimates is 29.57 mL.
Does this page use US fl oz or Imperial (UK) fl oz?
This page converts US fluid ounces (fl oz) to milliliters. Imperial (UK) fluid ounces are different (1 UK fl oz = 28.4130625 mL). Use the UK-specific converter if needed.
How many ounces are in 500 mL?
500 mL ÷ 29.5735295625 ≈ 16.907 US fl oz. To convert mL back to ounces, divide by 29.5735295625.
Is an ounce a measure of weight or volume?
A fluid ounce (fl oz) measures volume; an ounce (oz) measures weight. This page converts volume (US fl oz → mL).
Tips for Accurate Kitchen & Lab Measures
- Use graduated cylinders, syringes, or measuring cups to reduce parallax error.
- Label whether values are US or UK fl oz to prevent confusion.
- For very small volumes, metric spoons (5 mL, 15 mL) provide quick, repeatable measures.