How many ml are in 1 US fluid ounce?

One US fluid ounce equals exactly 29.5735295625 milliliters (commonly rounded to 29.57 ml).

How many ml are in 1 imperial fluid ounce?

One imperial (UK) fluid ounce equals exactly 28.4130625 milliliters (commonly rounded to 28.41 ml).

What is the difference between US and imperial fluid ounces?

The US fluid ounce is based on the US gallon (128 fl oz = 3,785 ml), while the imperial fluid ounce is based on the imperial gallon (160 fl oz = 4,546 ml). The US fl oz is about 4% larger than the imperial fl oz.

How do I convert fluid ounces to milliliters manually?

Multiply the number of US fl oz by 29.5735, or multiply imperial fl oz by 28.4131. For example, 8 US fl oz = 8 × 29.5735 = 236.59 ml.

How many fl oz is 250 ml?

250 ml is approximately 8.45 US fluid ounces or 8.80 imperial fluid ounces.

Is a fluid ounce the same as a weight ounce?

No. A fluid ounce measures volume, while a weight ounce (oz) measures mass. They are numerically close only for water (1 fl oz of water weighs about 1.04 oz), but differ significantly for other liquids.

Is 1 oz the same as 30 ml?

Roughly. 1 US fluid ounce is 29.5735 ml, so 30 ml is a common rounding used in cooking and medicine. For precise dosing, use 29.57 ml per US fl oz.

Fluid Ounces to Milliliters Converter

Name: Fluid Ounces to Milliliters Converter
Availability: InStock
Author: Nham Vu

Convert US or imperial fluid ounces to milliliters instantly, with a quick-reference conversion table.

Fluid Ounces to Milliliters

Fluid Ounce Type

1 US fl oz = 29.5735 ml

Fluid Ounces (fl oz)

Result — Milliliters (ml)

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Or enter Milliliters to get fl oz

Result — Fluid Ounces (fl oz) —

Quick Reference Table

Showing US fl oz values

fl oz	ml	Common size

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Summary

Convert US or imperial fluid ounces to milliliters instantly, with a quick-reference conversion table.

How it works

Enter the number of fluid ounces in the input field.
Select whether you are using US fluid ounces or imperial fluid ounces.
The equivalent milliliter value appears instantly.
Use the quick-reference table to look up common fl oz amounts at a glance.
Click the swap button to reverse the conversion from ml back to fl oz.

Use cases

Convert recipe measurements from US cookbooks into metric milliliters.
Convert bottle and can sizes (12 fl oz, 16 fl oz, etc.) for international labeling.
Check liquid medication dosages listed in fluid ounces against ml syringes.
Compare beverage volumes across US and UK product listings.
Convert baby formula instructions between fl oz and ml.
Help travelers understand liquid capacity limits stated in fl oz.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu