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Ounces to Milliliters Converter (oz to ml)

Convert between US fluid ounces (oz) and milliliters (ml) with this easy-to-use calculator.

Ounces to Milliliters (oz to ml)

About Volume Conversion

The relationship between ounces (oz) and milliliters (ml) is:

  • 1 US fluid ounce = 29.5735 milliliters
  • 1 milliliter = 0.033814 US fluid ounces

This converter uses the US fluid ounce, which is different from:

  • UK/Imperial fluid ounce (1 UK fl oz = 28.4131 ml)
  • Ounce as a weight measurement (for mass, not volume)

For cooking recipes, accurate conversion between oz to ml is especially important as small differences can affect the outcome.

Conversion Result

29.57 ml

1 fl oz = 29.57 ml

US fluid ounces converted to milliliters using the standard conversion factor of 29.5735 ml per fluid ounce.

Common oz to ml Conversions

Fluid Ounces (oz) Milliliters (ml) Common Use
0.5 oz 14.79 ml Single espresso shot
1 oz 29.57 ml Standard shot
2 oz 59.15 ml Double shot
4 oz 118.29 ml Small juice glass
6 oz 177.44 ml Typical yogurt serving
8 oz 236.59 ml Standard cup
12 oz 354.88 ml Standard soda can
16 oz 473.18 ml Pint / Water bottle
20 oz 591.47 ml Standard soda bottle
32 oz 946.35 ml Quart / Large drink
Conversion Basics
Practical Uses
Measurement History
Cooking Tips

Understanding Fluid Ounce to Milliliter Conversion

The oz to ml conversion is a fundamental volume conversion used worldwide. Here's what you need to know:

  • Exact conversion: 1 US fluid ounce = 29.5735295625 milliliters
  • Practical conversion: 1 US fluid ounce ≈ 29.57 milliliters
  • Inverse conversion: 1 milliliter = 0.033814 US fluid ounces

The milliliter is part of the metric system used by most countries, while fluid ounces are primarily used in the United States and a few other countries. Converting between oz to ml is essential for international recipes, medication dosing, and various scientific applications.

The difference between US and UK fluid ounces is significant enough to affect precise measurements:

  • 1 US fluid ounce = 29.5735 milliliters
  • 1 UK/Imperial fluid ounce = 28.4131 milliliters

This calculator uses the US fluid ounce standard, which is the most commonly referenced in American recipes and product labeling.

Practical Applications for oz to ml Conversions

Accurate conversion between fluid ounces and milliliters is crucial in many daily and professional contexts:

  • Cooking and Baking: International recipes often list ingredients in different measurement systems. Converting from oz to ml ensures the correct amount of liquid ingredients.
  • Medication and Health: Medicine dosages may be prescribed in milliliters but measured using household teaspoons or tablespoons (related to fluid ounces). Proper conversion is vital for correct dosing.
  • Beverage Industry: Drink recipes, cocktails, and coffee preparations often require precision in liquid measurements across different systems.
  • Cosmetics and Essential Oils: Small amounts of liquids in these industries need exact measurements, often converting between oz and ml.
  • Scientific Research: Laboratory work frequently requires conversion between different volume units.
  • Travel: Understanding liquid restrictions for carry-on luggage (typically specified in ml) when you're used to oz measurements.

Being able to quickly convert between oz to ml helps avoid measurement errors that could affect cooking results, medication efficacy, or product quality.

The History of Fluid Ounces and Milliliters

Understanding the historical context of these measurements helps explain why we need to convert between oz to ml today:

Fluid Ounce (oz)

The fluid ounce has ancient roots:

  • Derived from Roman and Anglo-Saxon measurement systems
  • Originally defined as the volume of one ounce of water by weight
  • The US fluid ounce was standardized in the early 19th century
  • Different from the Imperial fluid ounce used in the UK until recently
  • Remains the standard volume measurement in the US despite global metric adoption
Milliliter (ml)

The milliliter is a much newer measurement:

  • Part of the metric system developed during the French Revolution (1790s)
  • Defined precisely as one-thousandth of a liter (1 cubic centimeter)
  • Adopted by most countries worldwide as part of the International System of Units (SI)
  • Provides a decimal-based, scientifically precise measurement system
  • The standard for scientific, medical, and most international commercial applications

The need to convert oz to ml arose as global trade, travel, and communication increased, requiring translation between the traditional US system and the internationally adopted metric system.

Kitchen Conversions and Cooking Tips

When using oz to ml conversions in cooking and baking, keep these practical tips in mind:

  • Recipe Origin Matters: American recipes typically use fluid ounces, while recipes from most other countries use milliliters. Identify the recipe's origin to understand which measurement system it's based on.
  • Measuring Tools: Use the right measuring cup for the system you're working with. Cups marked with ml measurements are more precise than attempting to estimate a conversion.
  • Rounding Considerations: For most cooking purposes, rounding to 30 ml per fluid ounce is acceptable. For baking and precise recipes, use the exact conversion of 29.57 ml.
  • Common Kitchen Equivalents:
    • 1 tablespoon = 0.5 fluid ounce = approximately 15 ml
    • 1 teaspoon = 0.17 fluid ounce = approximately 5 ml
    • 1 cup = 8 fluid ounces = approximately 237 ml
    • 1 pint = 16 fluid ounces = approximately 473 ml
    • 1 quart = 32 fluid ounces = approximately 946 ml
    • 1 gallon = 128 fluid ounces = approximately 3,785 ml
  • Digital Scale Trick: For the most precise liquid measurements, use a digital scale. Since 1 ml of water weighs 1 gram, you can measure milliliters by weight.

Remember that proper measurement conversion is especially important for baked goods and cocktails, where proportions significantly affect the final product.

Picture of Dr. Evelyn Carter

Dr. Evelyn Carter

Author | Chief Calculations Architect & Multi-Disciplinary Analyst

Table of Contents

Oz to Ml Converter: Precise Fluid Ounce to Milliliter Conversion Made Simple

Converting between fluid ounces (oz) and milliliters (ml) is essential for cooking, medicine dosing, and international travel. Our comprehensive oz to ml converter above helps you quickly and accurately convert between these common volume measurements with just a few clicks, providing precision for all your conversion needs.

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Why You Need an Oz to Ml Converter

When working with recipes, medication, or products from different countries, you’ll frequently encounter both fluid ounces and milliliters. Understanding the oz to ml relationship is crucial for:

Key Benefits of Our Oz to Ml Converter

  • Recipe perfection – Convert international recipes accurately for consistent results
  • Precise medication dosing – Ensure correct liquid medicine measurements
  • Travel preparation – Verify liquid amounts for international flight restrictions
  • Bilingual understanding – Bridge the gap between US and metric measurement systems
  • Science applications – Support laboratory work requiring volume conversions

With the US primarily using fluid ounces and the rest of the world using milliliters, converting between oz to ml has become an everyday necessity. Our calculator eliminates the mental math and potential errors that come with manual conversions.

The Science Behind Oz to Ml Conversion

Understanding the precise relationship between ounces and milliliters helps explain why a digital converter is so valuable:

The Exact Conversion Rate

The mathematical relationship between fluid ounces and milliliters is:

  • 1 US fluid ounce (fl oz) = 29.5735295625 milliliters (ml)
  • 1 milliliter (ml) = 0.033814 US fluid ounces (fl oz)

For everyday use, this is typically rounded to 29.57 ml per fluid ounce. However, in scientific, medical, or culinary applications requiring precision, using the exact conversion factor is crucial.

Different Types of Fluid Ounces

When converting oz to ml, it’s important to know which fluid ounce you’re working with:

  • US fluid ounce: 29.5735 ml (used in the United States)
  • UK/Imperial fluid ounce: 28.4131 ml (used historically in the UK)

This difference of approximately 1.16 ml per ounce might seem small, but it becomes significant when measuring larger volumes or in precision applications. Our calculator uses the US fluid ounce standard, which is the most common in modern usage.

Common Oz to Ml Conversions for Everyday Use

For quick reference, here are some commonly needed oz to ml conversions you might use in daily life:

Beverage Measurements

  • 1 oz = 29.57 ml (standard shot)
  • 8 oz = 236.59 ml (standard cup)
  • 12 oz = 354.88 ml (soda can)
  • 16.9 oz = 500 ml (typical water bottle)
  • 20 oz = 591.47 ml (large bottle)
  • 33.8 oz = 1 liter (1000 ml)

Cooking Measurements

  • 0.5 oz = 14.79 ml (1 tablespoon)
  • 2 oz = 59.15 ml (1/4 cup)
  • 4 oz = 118.29 ml (1/2 cup)
  • 8 oz = 236.59 ml (1 cup)
  • 16 oz = 473.18 ml (1 pint)
  • 32 oz = 946.35 ml (1 quart)

Travel Quantities

  • 3.4 oz = 100.55 ml (TSA liquid limit)
  • 6.76 oz = 200 ml (small duty-free item)
  • 10.14 oz = 300 ml (travel shampoo)
  • 13.53 oz = 400 ml (larger toiletry)
  • 16.91 oz = 500 ml (standard water bottle)

Medical Dosages

  • 0.17 oz = 5 ml (teaspoon dose)
  • 0.34 oz = 10 ml (children’s medicine cup)
  • 0.68 oz = 20 ml (standard medicine cup)
  • 1.01 oz = 30 ml (monthly liquid supplement)
  • 2.03 oz = 60 ml (larger medicine bottle)

Common Questions About Oz to Ml Conversion

How many milliliters are in a fluid ounce?

There are exactly 29.5735295625 milliliters in one US fluid ounce. For practical everyday use, this is commonly rounded to 29.57 ml per fluid ounce. The oz to ml conversion is a straight multiplication: simply multiply the number of fluid ounces by 29.57 to get the equivalent in milliliters. For example, 8 fluid ounces equals approximately 236.59 ml (8 × 29.57 = 236.59). Note that this refers specifically to US fluid ounces, as UK/Imperial fluid ounces are slightly different at 28.4131 ml per ounce.

What’s the difference between US and UK fluid ounces when converting oz to ml?

The difference between US and UK fluid ounces is significant when performing accurate oz to ml conversions. A US fluid ounce equals 29.5735 ml, while a UK (Imperial) fluid ounce equals 28.4131 ml. This means the US fluid ounce is about 4.1% larger than its UK counterpart. This difference becomes more noticeable with larger volumes—for example, a US gallon (128 fl oz) is 3,785 ml, while an Imperial gallon (160 fl oz) is 4,546 ml. Most modern recipes and product labels use US fluid ounces, but older British recipes might use Imperial measurements. When precision matters, it’s important to know which system you’re working with before using an oz to ml converter.

Why do I need to convert oz to ml for cooking and baking?

Converting between oz to ml is essential for cooking and baking for several reasons. First, recipes from different countries use different measurement systems—American recipes typically use fluid ounces, while recipes from most other countries use milliliters. Second, precision matters greatly in baking, where slight measurement differences can affect the final product’s texture and consistency. Third, many liquid ingredients (especially specialty items) are labeled in milliliters worldwide, requiring conversion to follow American recipes. Fourth, modern digital kitchen scales often offer both measurement systems, making conversion helpful for using either type of equipment. Finally, professional culinary training increasingly emphasizes metric measurements (ml) for their precision and consistency, making oz to ml conversion a valuable skill for advancing home cooks.

Are ounces always a liquid measurement when converting oz to ml?

No, and this is a common source of confusion when using an oz to ml converter. The term “ounce” can refer to either volume (fluid ounce) or weight (avoirdupois ounce), which are fundamentally different types of measurement. Only fluid ounces (fl oz) can be directly converted to milliliters since both are volume measurements. One fluid ounce equals approximately 29.57 ml. Weight ounces, on the other hand, measure mass rather than volume and equal 28.35 grams. For liquid ingredients, fl oz can be converted to ml. For dry ingredients like flour or sugar, weight measurements (in grams or ounces) are more accurate than volume. This distinction is crucial because the density of ingredients varies widely—a fluid ounce of water weighs about one ounce, but a fluid ounce of honey weighs significantly more.

How can I convert milliliters to ounces?

To convert milliliters to fluid ounces, you need to divide the volume in milliliters by 29.5735 (or use the simplified 29.57 for everyday calculations). Mathematically: Fluid Ounces = Milliliters ÷ 29.57. For example, to convert 500 ml to fluid ounces: 500 ÷ 29.57 = 16.91 fl oz. Our converter above makes this process simple with its two-way conversion feature—just toggle between “oz to ml” and “ml to oz” modes. For quick mental calculations, you can use the approximation that 30 ml is roughly equal to 1 fluid ounce, though this slightly overestimates the actual value. Common conversions worth remembering include: 50 ml ≈ 1.7 fl oz, 100 ml ≈ 3.4 fl oz, 250 ml ≈ 8.45 fl oz, and 1000 ml (1 liter) ≈ 33.81 fl oz.

Related Conversion Calculators

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The Scientific Basis of Oz to Ml Conversion

Volume measurement standards have been established through rigorous scientific processes:

  • The milliliter is precisely defined as one cubic centimeter (1 cm³) in the International System of Units (SI).
  • The US fluid ounce was standardized by the United States National Institute of Standards and Technology as exactly 29.5735295625 milliliters.
  • Research in metrology (the science of measurement) shows that the milliliter provides more precision for scientific and medical applications due to its decimal-based nature.
  • Studies in culinary science have demonstrated that accurate oz to ml conversions significantly improve recipe consistency, especially in baking.
  • The medical community globally has standardized on milliliters for medication dosing due to its precision, with conversion from ounces being necessary in some regions.

These scientific standards ensure that our oz to ml converter provides accurate and reliable conversion results for all applications.

Measurement Disclaimer

The Oz to Ml Converter and accompanying information are provided for educational and reference purposes only. While we strive for mathematical accuracy in our conversion calculations, users should be aware of the following:

Conversion results are based on the standard US fluid ounce to milliliter relationship. For extremely precise applications in laboratory sciences, pharmacy compounding, or certain manufacturing processes, specialized equipment and standards may be required beyond what this calculator provides.

Users should always verify critical measurements using calibrated instruments appropriate to their specific application, particularly for health-related, commercial, or scientific uses.

Last Updated: March 18, 2025 | Next Review: March 18, 2026