Fluid ounces to Cups Converter
1 fluid ounce (fl oz) equals 0.125 cups (cup).
Quick answer
To convert US fluid ounces to cups, divide by 8: 16 fl oz = 2 cups, 12 fl oz = 1½ cups.
- 1 fluid ounce = 0.125 cups
- 1 cup = 8 fluid ounces
- Formula: cup = fl oz ÷ 8
- Quick estimate: divide by 8: 4 fl oz = ½ cup.
1 fluid ounce = 0.125 cups
How to convert fluid ounces to cups
cup = fl oz ÷ 8
To convert fluid ounces to cups, divide the number of fluid ounces by 8.
Example: 42 fl oz to cup
- Start with the value in fluid ounces: 42 fl oz.
- Divide by 8: 42 ÷ 8 = 5.25.
- Result: 42 fluid ounces = 5.25 cups.
Going the other way, 1 cup = 8 fluid ounces, so to convert cups back to fluid ounces you multiply by the same number. See cups to fluid ounces.
Where the conversion factor comes from
In US customary measure: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces. A US quart is 946.35 mL and a US cup 236.59 mL. UK (imperial) quarts and pints are about 20% larger.
Mental math: fl oz to cup in your head
Divide by 8. Memorize 2 fl oz = ¼ cup, 4 fl oz = ½ cup, 6 fl oz = ¾ cup.
When you need to convert fluid ounces to cups
- Drink sizes and liquid measuring cups.
- Recipes that mix ounces and cups.
Common mistakes
- Converting weight ounces to cups with this rule: only fluid ounces work.
Everyday fluid ounces in cups
| Example | Fluid ounces | Cups |
|---|---|---|
| Juice box | 6.75 fl oz | 0.84375 cup |
| Can of soda | 12 fl oz | 1.5 cup |
| Bottle of water | 16.9 fl oz | 2.1125 cup |
| Large coffee | 20 fl oz | 2.5 cup |
Fluid ounces to cups conversion table
| Fluid ounces (fl oz) | Cups (cup) |
|---|---|
| 0.1 fl oz | 0.0125 cup |
| 0.2 fl oz | 0.025 cup |
| 0.3 fl oz | 0.0375 cup |
| 0.4 fl oz | 0.05 cup |
| 0.5 fl oz | 0.0625 cup |
| 0.6 fl oz | 0.075 cup |
| 0.7 fl oz | 0.0875 cup |
| 0.8 fl oz | 0.1 cup |
| 0.9 fl oz | 0.1125 cup |
| 1 fl oz | 0.125 cup |
| 1.5 fl oz | 0.1875 cup |
| 2 fl oz | 0.25 cup |
| 2.5 fl oz | 0.3125 cup |
| 3 fl oz | 0.375 cup |
| 3.5 fl oz | 0.4375 cup |
| 4 fl oz | 0.5 cup |
| 4.5 fl oz | 0.5625 cup |
| 5 fl oz | 0.625 cup |
| 6 fl oz | 0.75 cup |
| 7 fl oz | 0.875 cup |
| 7.5 fl oz | 0.9375 cup |
| 8 fl oz | 1 cup |
| 9 fl oz | 1.125 cup |
| 10 fl oz | 1.25 cup |
| 11 fl oz | 1.375 cup |
| 12 fl oz | 1.5 cup |
| 13 fl oz | 1.625 cup |
| 14 fl oz | 1.75 cup |
| 15 fl oz | 1.875 cup |
| 16 fl oz | 2 cup |
| 17 fl oz | 2.125 cup |
| 18 fl oz | 2.25 cup |
| 19 fl oz | 2.375 cup |
| 20 fl oz | 2.5 cup |
| 21 fl oz | 2.625 cup |
| 22 fl oz | 2.75 cup |
| 23 fl oz | 2.875 cup |
| 24 fl oz | 3 cup |
| 25 fl oz | 3.125 cup |
| 26 fl oz | 3.25 cup |
More fl oz to cup values
- 27 fl oz
- 28 fl oz
- 29 fl oz
- 30 fl oz
- 31 fl oz
- 32 fl oz
- 33 fl oz
- 34 fl oz
- 35 fl oz
- 36 fl oz
- 37 fl oz
- 38 fl oz
- 39 fl oz
- 40 fl oz
- 41 fl oz
- 42 fl oz
- 43 fl oz
- 44 fl oz
- 45 fl oz
- 46 fl oz
- 47 fl oz
- 48 fl oz
- 49 fl oz
- 50 fl oz
- 51 fl oz
- 52 fl oz
- 53 fl oz
- 54 fl oz
- 55 fl oz
- 56 fl oz
- 57 fl oz
- 58 fl oz
- 59 fl oz
- 60 fl oz
- 61 fl oz
- 62 fl oz
- 63 fl oz
- 64 fl oz
- 65 fl oz
- 66 fl oz
- 67 fl oz
- 68 fl oz
- 69 fl oz
- 70 fl oz
- 71 fl oz
- 72 fl oz
- 73 fl oz
- 74 fl oz
- 75 fl oz
- 76 fl oz
- 77 fl oz
- 78 fl oz
- 79 fl oz
- 80 fl oz
- 81 fl oz
- 82 fl oz
- 83 fl oz
- 84 fl oz
- 85 fl oz
- 86 fl oz
- 87 fl oz
- 88 fl oz
- 89 fl oz
- 90 fl oz
- 91 fl oz
- 92 fl oz
- 93 fl oz
- 94 fl oz
- 95 fl oz
- 96 fl oz
- 97 fl oz
- 98 fl oz
- 99 fl oz
- 100 fl oz
- 110 fl oz
- 120 fl oz
- 130 fl oz
- 140 fl oz
- 150 fl oz
- 160 fl oz
- 170 fl oz
- 180 fl oz
- 190 fl oz
- 200 fl oz
- 210 fl oz
- 220 fl oz
- 230 fl oz
- 240 fl oz
- 250 fl oz
- 260 fl oz
- 270 fl oz
- 280 fl oz
- 290 fl oz
- 300 fl oz
- 310 fl oz
- 320 fl oz
- 330 fl oz
- 340 fl oz
- 350 fl oz
- 360 fl oz
- 370 fl oz
- 380 fl oz
- 390 fl oz
- 400 fl oz
- 410 fl oz
- 420 fl oz
- 430 fl oz
- 440 fl oz
- 450 fl oz
- 460 fl oz
- 470 fl oz
- 480 fl oz
- 490 fl oz
- 500 fl oz
- 600 fl oz
- 700 fl oz
- 800 fl oz
- 900 fl oz
- 1,000 fl oz
- 1,200 fl oz
- 1,500 fl oz
- 2,000 fl oz
- 2,500 fl oz
- 3,000 fl oz
- 4,000 fl oz
- 5,000 fl oz
- 10,000 fl oz
What is a fluid ounce?
The US fluid ounce is a unit of volume equal to 1/128 of a US gallon, about 29.57 mL.
What is a cup?
The US customary cup is a cooking measure equal to 8 US fluid ounces, half a pint, or 16 tablespoons, about 236.6 mL.
Convert fluid ounces to other units
Convert other units to cups
Frequently asked questions
How many cups are in a fluid ounce?
One fluid ounce is 0.125 cups.
How many fluid ounces are in a cup?
One cup is 8 fluid ounces.
What is the formula to convert fluid ounces to cups?
cup = fl oz ÷ 8.
How many cups is 16 oz?
2 cups (16 US fl oz).