Oz to Ml Converter

Common Oz to Ml Conversions

These are the most frequently searched fluid oz to ml conversions. Each value is calculated using the exact US conversion factor of 1 fl oz = 29.5735 ml:

• 1 oz to ml: 1 × 29.5735 = 29.57 ml
• 2 oz to ml: 2 × 29.5735 = 59.15 ml
• 4 oz to ml: 4 × 29.5735 = 118.29 ml
• 8 oz to ml: 8 × 29.5735 = 236.59 ml (1 cup)
• 12 oz to ml: 12 × 29.5735 = 354.88 ml
• 16 oz to ml: 16 × 29.5735 = 473.18 ml (1 pint)
• 32 oz to ml: 32 × 29.5735 = 946.35 ml (1 quart)
• 64 oz to ml: 64 × 29.5735 = 1,892.71 ml (½ gallon)
• 128 oz to ml: 128 × 29.5735 = 3,785.41 ml (1 gallon)

To convert these same values to litres instead, use our oz to liter converter. To go from oz to gallons, use the oz to gallon converter.

Oz to Ml Conversion Table

This comprehensive table covers fluid ounces to milliliters from a single ounce up to a full gallon, with the litre equivalent included for reference:

How to Convert Oz to Ml

Converting fluid ounces to milliliters uses a single multiplication step. The exact conversion factor is:

To convert in the opposite direction — ml back to oz — simply divide by 29.5735:

Step-by-Step Examples

Example 1: Convert 6 oz to ml

1. Take the fluid ounces: 6 oz
2. Multiply by 29.5735: 6 × 29.5735 = 177.44 ml

Example 2: Convert 250 ml to oz

1. Take the milliliters: 250 ml
2. Divide by 29.5735: 250 ÷ 29.5735 = 8.45 fl oz

Example 3: Convert 16.9 oz to ml

1. Take the fluid ounces: 16.9 oz
2. Multiply by 29.5735: 16.9 × 29.5735 = 499.79 ml ≈ 500 ml

This is why standard bottled water is labelled both "16.9 fl oz" and "500 ml" — the two figures refer to the same volume. For a deeper look at how oz relates to litres, see our oz to liter guide.

What Is a Fluid Ounce?

A fluid ounce (fl oz) is a unit of liquid volume in the US customary and UK imperial measurement systems. The critical distinction is that a fluid ounce measures volume — not weight. A dry ounce measures mass; a fluid ounce measures how much space a liquid occupies.

In the United States:

• 1 US fl oz = 29.5735 ml
• 1 US fl oz = 1/128 gallon
• 1 US fl oz = 1/32 quart
• 1 US fl oz = 1/8 cup

Fluid ounces appear on nutrition labels, beverage packaging, medicine dosage instructions, and cooking recipes throughout the US. Understanding the ml equivalent makes it easy to work with both metric and US measurements interchangeably.

The official definition is maintained by the National Institute of Standards and Technology (NIST).

What Is a Milliliter?

A milliliter (ml) is a metric unit of volume equal to one thousandth of a litre (1 ml = 0.001 L). It belongs to the International System of Units (SI) and is used as the standard volume measurement for liquids in science, medicine, and everyday life across most of the world.

Key milliliter reference points:

• 1 ml = volume of 1 cubic centimetre (1 cm³)
• 5 ml = 1 standard teaspoon
• 15 ml = 1 standard tablespoon
• 240 ml ≈ 1 US cup (8 fl oz)
• 1,000 ml = 1 litre

Because the milliliter is decimal-based, scaling up and down is straightforward — no fractions required. This makes it the preferred unit in pharmaceutical dosing, laboratory work, and international recipe writing.

US vs UK Fluid Ounces — What Is the Difference?

The fluid ounce is not the same in all countries. The US and UK use different definitions, and confusing them leads to measurement errors of around 4%:

In practice, all standard US product labels, nutrition facts, and recipes use the US fluid ounce = 29.5735 ml definition. All conversions on this page use the US fl oz. If you are working with British recipes or UK-labelled products, note that their fluid ounces are slightly smaller.

Practical Use Cases for Oz to Ml Conversion

Cooking and Baking

Many American recipes specify liquid ingredients in fluid ounces, while metric kitchen scales and measuring equipment use milliliters. Converting between the two is a daily task when cooking from US cookbooks outside the US, or when scaling recipes that blend both measurement systems. For example, a sauce recipe calling for 4 fl oz of cream requires 118.29 ml.

Medicine and Pharmacy

Liquid medications in the United States are often labelled in both fl oz and ml. Dosage instructions for children's medicine typically read in milliliters for precision — for example, a 5 ml dose equals approximately 0.17 fl oz. Knowing the oz-to-ml conversion helps when switching between US and international medication packaging.

Beverages and Bartending

Cocktail recipes written in US measures use fluid ounces almost exclusively. A standard 1.5 oz shot equals 44.36 ml. Bartending jiggers are often dual-sided, showing oz on one side and ml on the other. Converting helps when following international bar guides or when pouring for guests from countries that use metric measurements.

Fitness and Hydration Tracking

Fitness apps and hydration trackers often allow input in either fl oz or ml. Daily water goals are commonly stated as 64 oz (1,892 ml) or 128 oz (3,785 ml). Understanding the ml equivalent of your water bottle — whether it's a 16 oz (473 ml) or 32 oz (946 ml) bottle — makes tracking consistent across different apps and devices.

For related volume conversions, see: Oz to Quart | Oz to Gallon | How Many Water Bottles Make a Gallon?

Frequently Asked Questions — Oz to Ml