Cups to Ounces
Type US cups, see US fluid ounces (fl oz).
By Akash Yadav Updated 19 October 2026
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The formula
How to convert cups to fluid ounces
To change cups into fluid ounces, multiply by 8.
fluid ounces = cups × 8
Going the other way: cups = fluid ounces ÷ 8
1 US cup = 8 fluid ounces. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 3 cups. Multiply by 8. 3 × 8 = 24 fl oz.
Common values
Cups to fluid ounces conversion table
| Cups (cup) | Fluid ounces (fl oz) |
|---|---|
| 0.125 cup | 1 fl oz |
| 0.25 cup | 2 fl oz |
| 0.5 cup | 4 fl oz |
| 0.75 cup | 6 fl oz |
| 1 cup | 8 fl oz |
| 1.25 cup | 10 fl oz |
| 1.5 cup | 12 fl oz |
| 2 cup | 16 fl oz |
| 2.5 cup | 20 fl oz |
| 3 cup | 24 fl oz |
| 4 cup | 32 fl oz |
| 6 cup | 48 fl oz |
| 8 cup | 64 fl oz |
| 16 cup | 128 fl oz |
Before you rely on it
Fluid ounces, and which cup
This page uses the US customary cup, exactly 8 US fluid ounces. Every answer is exact: multiply by 8.
Australia, New Zealand and most modern Canadian recipes use a 250 mL metric cup, about 8.45 US fl oz. US nutrition labels use a 240 mL cup, about 8.12 fl oz. Neither difference matters much in the kitchen.
A cup measures volume. "8 oz" on a bag of flour or a block of cheese is a weight, and a cup of a solid ingredient weighs whatever that ingredient weighs — not 8 oz.
Common questions
Frequently asked questions
How many ounces are in a cup?
1 US cup is exactly 8 fluid ounces.
How many ounces is half a cup?
Half a cup is exactly 4 fl oz.
How many ounces is a quarter cup?
A quarter cup is exactly 2 fl oz.
How many ounces is 3/4 cup?
Three quarters of a cup is exactly 6 fl oz.
How many ounces is 2 cups?
2 cups is exactly 16 fl oz — one US pint.
How many ounces is 4 cups?
4 cups is exactly 32 fl oz — one US quart.
Is a cup of flour 8 ounces?
Not by weight. A cup holds 8 fluid ounces of space, and how much a cup of flour weighs depends on the flour and how it is packed — see the note above.
Keep going
Related converters
- Ounces to Cups fl oz → cup
- Cups to Milliliters cup → mL
- Ounces to Milliliters fl oz → mL
- Cups to Pints cup → pt
- All volume converters
Read next
Guides that cover this conversion
Every factor on this page is listed in our conversion methodology.