-
Converts liquid volume measurements from fluid ounces (fl oz) to milliliters (mL).
-
Important distinction: A fluid ounce measures volume, while a regular ounce (oz) measures mass/weight. They are different units
-
-
US fluid ounce: 1 fl oz ≈ 29.6 mL
-
UK Imperial fluid ounce: 1 fl oz ≈ 28.4 mL
-
-
Conversion formulas:
-
US: mL = fl oz × 29.6
-
UK: mL = fl oz × 28.4
-
-
Enter the ounce value, choose the unit type, and get the equivalent milliliter measurement.
-
Common uses: Useful for recipes, cooking, beverages, and comparing measurements across US and UK systems.
​
Fluid Ounces to Milliliters (oz to ml)
Fluid Ounces to Milliliters (oz to mL) conversion is commonly used for cooking, baking, medicine, beverages, cosmetics, and laboratory measurements. Since the United States primarily uses fluid ounces while most other countries use milliliters, converting between these units helps ensure accurate measurements and consistency. To convert fluid ounces to milliliters, multiply the number of fluid ounces by 29.5735 (US fluid ounces). For example, 1 oz = 29.57 mL, 8 oz = 236.59 mL, and 16 oz = 473.18 mL. Using an oz to mL converter makes it quick and easy to switch between U.S. customary and metric units for recipes, product labels, healthcare, and scientific applications.
1 US fluid ounce = 29.5735 milliliters
2015-2017
Degree
University Name
How many ml is a shot (1.5 oz)? 1.5 fl oz = 44.36 ml — the standard US bartending shot size.
How many ml is a water bottle (16.9 oz)? 16.9 fl oz = 499.99 ml — essentially the standard 500 ml bottled water size.
How many ml is a coffee cup (8 oz)? 8 fl oz = 236.59 ml, though many "cups" in coffee makers are actually closer to 5–6 oz (about 150–177 ml).
How many ml is a wine glass pour (5 oz)? 5 fl oz = 147.87 ml, the standard restaurant wine pour in the US.
Why This Conversion Matters
Degree
University Name
-
Cooking and baking: International recipes (especially from the UK, Australia, and Europe) use milliliters almost exclusively, while US recipes use fluid ounces and cups.
-
Skincare and beauty products: Many serums, perfumes, and lotions list volume in both oz and ml, and travel-size restrictions (like the TSA's 3.4 oz / 100 ml liquid rule) hinge on this exact conversion.
-
Health and medicine: Liquid medication dosages are often prescribed in ml, but US household measuring tools use oz — a mix-up here can actually be dangerous.
-
Fitness and hydration tracking: Water bottles and hydration apps often mix ml and oz depending on the region.
Fluid Ounces to Milliliters Conversion
Converter/Calculator
Frequently Asked Questions
Is 1 oz the same as 30 ml? Not exactly, but it's close. 1 fl oz is precisely 29.5735 ml. The "30 ml" figure is a rounded approximation widely used in cooking and skincare labeling.
How many ml are in 4 oz? 4 fl oz equals approximately 118.29 ml.
Is a fluid ounce the same as a regular ounce? No. A fluid ounce measures volume (liquid), while a regular ounce measures weight (mass). They are not interchangeable, and this is one of the most common points of confusion in unit conversion.
Why do some labels say 30 ml = 1 oz instead of 29.57 ml? Manufacturers often round to whole or clean numbers for simpler labeling, especially on cosmetics and supplements.
For larger quantities, common conversions include 4 ounces to ml, which is approximately 118.3 ml, 12 oz to ml, which equals about 354.9 ml, and 32 oz to ml, which is approximately 946.4 ml. Similarly, 40 oz to ml converts to around 1,182.9 ml.
Using an ounce to ml conversion calculator