Example 1
- Direction: fluid ounces to US cups
- 8 fl oz
1 US cup
How many US cups is 8 fl oz? 1 cup, because 8 divided by 8.
Ounces to Cups
The calculator converts fluid ounces to US cups. Eight fl oz is one cup, because a US cup is exactly 8 fluid ounces. This is not a mass ounce and not a 250 ml glass.
A mass ounce is on grams and ounces. A 250 ml glass is on cup to grams.
Result
Enter a volume in fluid ounces or in US cups. The result will appear here.
How it works
The calculator divides fluid ounces by 8. 8 fl oz is 1 US cup. 16 fl oz is 2 cups. A US cup is defined as 8 fluid ounces.
The other way, you multiply US cups by 8. 2 cups are 16 fl oz. Half a cup is 4 fl oz.
This is a fluid ounce, not a mass ounce. A mass ounce is on the grams and ounces page.
A 250 ml kitchen glass is not this cup. 250 ml belongs on the cup-to-grams page.
You may enter zero; the result is then also zero. The calculator does not accept negative numbers.
A comma and a period give the same fraction. 1.5 cups are 12 fl oz.
Formula
cups = fl oz / 8; fl oz = cups × 8
A US cup is 8 fluid ounces. That is the definition, not an estimate.
How to use
- Choose fluid ounces to US cups.
- Enter 8. The result is 1 US cup.
- Enter 16. The result is 2 cups.
- The other way, enter 2. The result is 16 fl oz.
8 fl oz is 1 US cup
A US cup holds 8 fluid ounces. 16 fl oz is 2 cups.
- fl oz
- US fluid ounce. 8 fl oz = 1 US cup.
- US cup
- 8 fluid ounces. This is not a 250 ml glass.
- 8
- The US cup constant. Not a rounding.
Examples
Example 2
- Direction: fluid ounces to US cups
- 16 fl oz
2 US cups
How many US cups is 16 fl oz? 2 cups, because 16 divided by 8.
Example 3
- Direction: US cups to fluid ounces
- 2 cups
16 fl oz
How many fl oz are 2 US cups? 16 fl oz, because 2 times 8.
Related calculators
Frequently asked questions
How many US cups is 8 fl oz?
1 cup. A US cup is 8 fluid ounces.
How many US cups is 16 fl oz?
2 cups. 16 divided by 8 is 2.
How many fl oz are 2 US cups?
16 fl oz. Two times 8.
Is this a mass ounce?
No. A mass ounce is on the grams and ounces page. This page uses the fluid ounce.
Is this a 250 ml glass?
No. A 250 ml glass is on the cup-to-grams page. Here a US cup is 8 fl oz.
Can volume be negative?
No. Zero is allowed; after conversion the result is still zero.
Is 1.5 cups 12 fl oz?
Yes. One and a half times 8 is 12.
Where do I convert millilitres?
On the millilitres and US fl oz page. That page has no cup field.
Do a comma and a period both work?
Yes. 2,5 and 2.5 give the same fraction.
Is this a tablespoon?
No. A tablespoon is on the tablespoons page. This page covers the cup and the fluid ounce.
Sources
A US cup is 8 fluid ounces.
Page updated in 2026.