Example 1
250 ml -> 8.4535 US fl oz.
Ml to fl oz
Type a volume and pick ml or US fl oz. 250 ml is 8.4535 fl oz. This is 1/128 of a US gallon, not the 28.41 ml UK ounce and not the 28.35 g mass ounce.
US volume. Gallon: liters and gallons. Mass: grams and ounces.
Result
Enter a value. The result shows up here.
How it works
A US fluid ounce is 1/128 of a US gallon, 29.5735295625 ml. On the page 1 US fl oz is 29.5735 ml. A 250 ml glass is 8.4535 US fl oz. An 8 fl oz cup is 236.5882 ml, not 250 ml. A 330 ml can is 11.1586 fl oz. Half a liter is 16.9070 fl oz. A 12 US fl oz bottle is 354.8824 ml. A 15 ml spoon is 0.5072 fl oz. 100 ml is about 3.3814 US fl oz.
A US recipe writes fl oz; an EU label writes ml. Type 250 and leave milliliters. A 250 ml glass is not an 8 oz cup. For batter, take 8 fl oz as 236.59 ml, or keep 250 ml and know it is 8.4535 fl oz.
Pick the direction from the list: ml to fl oz or fl oz to ml. A comma and a period both work. Typed zero is allowed. A minus is rejected. The switch sets ml or fl oz on an empty field and does not rewrite a typed 250.
Liters and gallons live next door, same US gallon. Mass in grams and ounces is a sibling page. Here it stays milliliter and fluid ounce, not the 28.35 g kitchen ounce.
The UK fluid ounce is 28.4130625 ml and is not in this calculator. The page does not know density: 100 ml of oil and 100 ml of water are the same volume here, different mass.
A kitchen glass is often 250 ml, while a US cup is 236.59 ml. That is the usual mix-up in batter and in sauce.
How to use
- Type a volume from a bottle or a recipe, for example 250 or 8.
- Pick ml to fl oz or fl oz to ml.
- Click Calculate. 250 ml gives 8.4535 US fl oz. 8 fl oz gives 236.5882 ml.
- A US ounce is 29.5735 ml. The UK ounce (28.41 ml) is not used here.
- For a gallon, open liters. For mass, open grams and ounces.
Formula
fl oz = ml / 29.5735295625
ml = fl oz × 29.5735295625
US liquid ounce = 1/128 US gal. The UK fl oz (28.4130625 ml) is not in this formula.
ml and US fl oz in this calculator
1 US fl oz = 29.5735 ml. 250 ml is 8.4535 fl oz. 8 US fl oz is 236.59 ml, not a 250 ml glass. The UK ounce differs.
- ml
- Millilitre. 250 ml glass, 330 ml can. 1000 ml is a litre, not a fl oz.
- fl oz
- US fluid ounce, 29.5735 ml. Not the 28.41 ml UK ounce and not a mass ounce.
Real-life examples
Example 2
1 US fl oz -> 29.5735 ml.
Example 3
330 ml -> 11.1586 US fl oz.
Example 4
8 US fl oz -> 236.5882 ml.
Example 5
500 ml -> 16.9070 US fl oz.
Example 6
12 US fl oz -> 354.8824 ml.
Example 7
15 ml -> 0.5072 US fl oz.
Ways to use this converter
- You convert 250 ml when a US recipe is in fluid ounces.
- You check an 8 fl oz cup against a 250 ml glass.
Frequently asked questions
How many ml is 1 US fl oz?
Exactly 29.5735295625 ml, 29.5735 ml on the page. That is 1/128 of the 3.785411784 L US gallon, not a mug rounding.
Is this the UK fluid ounce?
No. The UK ounce is 28.4130625 ml. This calculator stays US. Another definition, another number under the same fl oz label.
Is 8 fl oz a 250 ml glass?
No. 8 US fl oz = 236.5882 ml. 250 ml is 8.4535 fl oz. A metric glass and a US cup are two vessels.
Is this the same ounce as grams?
No. This is volume. The avoirdupois mass ounce is 28.3495 g on the gram page, with no ml field.
Can volume be negative?
Zero ml is allowed and gives zero fl oz. A minus is usually a typing mistake, not a negative glass.
How many fl oz are 100 ml, 330 ml, and 500 ml?
100 ml is about 3.3814 US fl oz. 330 ml is 11.1586. 500 ml is 16.9070. Same 29.5735 ml per ounce.
What does the header switch do?
On an empty field, metric sets ml and US sets fl oz. It does not rewrite a typed number, only the label.
How do I type 12.5 ml or a 15 ml spoon?
Use a comma or a period. 15 ml is 0.5072 US fl oz. 12.5 and 12,5 are the same ml.
Does oil density change the result?
No. We convert volume, not mass. 100 ml of oil and 100 ml of water are the same number here.
How many ml is 12 US fl oz?
354.8824 ml. That is a common US drink bottle. The product 12 × 29.5735.
Knowledge sources
The converter multiplies your number by an SI factor. NIST SP 330 and BIPM define the units, not your reading.
Page updated in 2026.