Type a value in US fluid ounces to get US cups instantly, or type in the cups (US) box to convert back. The formula with your number, related units and full tables are below.
fl oz
cup
Step-by-step calculation
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How to use the OZ to Cups Converter
Type a value in the Fluid ounces (US) box. The cups (US) result appears instantly.
Going the other way? Type in the Cups (US) box, or press the ⇄ swap button.
Set the precision with the decimal places menu.
Check the working in the step-by-step box, then press Copy result or click any row in the tables below.
Fluid ounces (US) to cups (US) formula
cup = fl oz ÷ 8
Take the value in US fluid ounces.
Divide it by 8 (the number of US fluid ounces in one US cup).
Example: 8 fl oz ÷ 8 = 1 cup.
Reverse formula (US cups to US fluid ounces): fl oz = cup × 8. Example: 2 cup × 8 = 16 fl oz.
The factor is a whole number (8), so this one is easy to do in your head or with long division.
fl oz to cup conversion table (1–100)
Click any row to load it into the converter.
Fluid ounces (US) to cups (US)
Fluid ounces (US)
Cups (US)
1 fl oz
0.125 cup
2 fl oz
0.25 cup
3 fl oz
0.375 cup
4 fl oz
0.5 cup
5 fl oz
0.625 cup
6 fl oz
0.75 cup
7 fl oz
0.875 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
27 fl oz
3.375 cup
28 fl oz
3.5 cup
29 fl oz
3.625 cup
30 fl oz
3.75 cup
31 fl oz
3.875 cup
32 fl oz
4 cup
33 fl oz
4.125 cup
34 fl oz
4.25 cup
35 fl oz
4.375 cup
36 fl oz
4.5 cup
37 fl oz
4.625 cup
38 fl oz
4.75 cup
39 fl oz
4.875 cup
40 fl oz
5 cup
41 fl oz
5.125 cup
42 fl oz
5.25 cup
43 fl oz
5.375 cup
44 fl oz
5.5 cup
45 fl oz
5.625 cup
46 fl oz
5.75 cup
47 fl oz
5.875 cup
48 fl oz
6 cup
49 fl oz
6.125 cup
50 fl oz
6.25 cup
51 fl oz
6.375 cup
52 fl oz
6.5 cup
53 fl oz
6.625 cup
54 fl oz
6.75 cup
55 fl oz
6.875 cup
56 fl oz
7 cup
57 fl oz
7.125 cup
58 fl oz
7.25 cup
59 fl oz
7.375 cup
60 fl oz
7.5 cup
61 fl oz
7.625 cup
62 fl oz
7.75 cup
63 fl oz
7.875 cup
64 fl oz
8 cup
65 fl oz
8.125 cup
66 fl oz
8.25 cup
67 fl oz
8.375 cup
68 fl oz
8.5 cup
69 fl oz
8.625 cup
70 fl oz
8.75 cup
71 fl oz
8.875 cup
72 fl oz
9 cup
73 fl oz
9.125 cup
74 fl oz
9.25 cup
75 fl oz
9.375 cup
76 fl oz
9.5 cup
77 fl oz
9.625 cup
78 fl oz
9.75 cup
79 fl oz
9.875 cup
80 fl oz
10 cup
81 fl oz
10.125 cup
82 fl oz
10.25 cup
83 fl oz
10.375 cup
84 fl oz
10.5 cup
85 fl oz
10.625 cup
86 fl oz
10.75 cup
87 fl oz
10.875 cup
88 fl oz
11 cup
89 fl oz
11.125 cup
90 fl oz
11.25 cup
91 fl oz
11.375 cup
92 fl oz
11.5 cup
93 fl oz
11.625 cup
94 fl oz
11.75 cup
95 fl oz
11.875 cup
96 fl oz
12 cup
97 fl oz
12.125 cup
98 fl oz
12.25 cup
99 fl oz
12.375 cup
100 fl oz
12.5 cup
Cups (US) to fluid ounces (US)
Cups (US)
Fluid ounces (US)
1 cup
8 fl oz
2 cup
16 fl oz
3 cup
24 fl oz
4 cup
32 fl oz
5 cup
40 fl oz
6 cup
48 fl oz
7 cup
56 fl oz
8 cup
64 fl oz
9 cup
72 fl oz
10 cup
80 fl oz
11 cup
88 fl oz
12 cup
96 fl oz
13 cup
104 fl oz
14 cup
112 fl oz
15 cup
120 fl oz
16 cup
128 fl oz
17 cup
136 fl oz
18 cup
144 fl oz
19 cup
152 fl oz
20 cup
160 fl oz
21 cup
168 fl oz
22 cup
176 fl oz
23 cup
184 fl oz
24 cup
192 fl oz
25 cup
200 fl oz
26 cup
208 fl oz
27 cup
216 fl oz
28 cup
224 fl oz
29 cup
232 fl oz
30 cup
240 fl oz
31 cup
248 fl oz
32 cup
256 fl oz
33 cup
264 fl oz
34 cup
272 fl oz
35 cup
280 fl oz
36 cup
288 fl oz
37 cup
296 fl oz
38 cup
304 fl oz
39 cup
312 fl oz
40 cup
320 fl oz
41 cup
328 fl oz
42 cup
336 fl oz
43 cup
344 fl oz
44 cup
352 fl oz
45 cup
360 fl oz
46 cup
368 fl oz
47 cup
376 fl oz
48 cup
384 fl oz
49 cup
392 fl oz
50 cup
400 fl oz
51 cup
408 fl oz
52 cup
416 fl oz
53 cup
424 fl oz
54 cup
432 fl oz
55 cup
440 fl oz
56 cup
448 fl oz
57 cup
456 fl oz
58 cup
464 fl oz
59 cup
472 fl oz
60 cup
480 fl oz
61 cup
488 fl oz
62 cup
496 fl oz
63 cup
504 fl oz
64 cup
512 fl oz
65 cup
520 fl oz
66 cup
528 fl oz
67 cup
536 fl oz
68 cup
544 fl oz
69 cup
552 fl oz
70 cup
560 fl oz
71 cup
568 fl oz
72 cup
576 fl oz
73 cup
584 fl oz
74 cup
592 fl oz
75 cup
600 fl oz
76 cup
608 fl oz
77 cup
616 fl oz
78 cup
624 fl oz
79 cup
632 fl oz
80 cup
640 fl oz
81 cup
648 fl oz
82 cup
656 fl oz
83 cup
664 fl oz
84 cup
672 fl oz
85 cup
680 fl oz
86 cup
688 fl oz
87 cup
696 fl oz
88 cup
704 fl oz
89 cup
712 fl oz
90 cup
720 fl oz
91 cup
728 fl oz
92 cup
736 fl oz
93 cup
744 fl oz
94 cup
752 fl oz
95 cup
760 fl oz
96 cup
768 fl oz
97 cup
776 fl oz
98 cup
784 fl oz
99 cup
792 fl oz
100 cup
800 fl oz
Common values
Fluid ounces (US)
Cups (US)
Example
0.5 fl oz
0.06 cup
1 tablespoon
1 fl oz
0.12 cup
1 fl oz (shot)
2 fl oz
0.25 cup
2 fl oz
4 fl oz
0.5 cup
Half cup
6 fl oz
0.75 cup
6 fl oz
8 fl oz
1 cup
1 cup
12 fl oz
1.5 cup
Can of soda
16 fl oz
2 cup
1 pint / water bottle
20 fl oz
2.5 cup
20 fl oz bottle
32 fl oz
4 cup
1 quart
64 fl oz
8 cup
Half gallon
128 fl oz
16 cup
1 gallon
About fluid ounces (US) and cups (US)
Fluid ounces (US) (fl oz). The US fluid ounce is 1/128 of a US gallon, about 29.57 mL. The UK imperial fluid ounce is slightly smaller at about 28.41 mL.
Cups (US) (cup). The US customary cup is 8 US fluid ounces, about 236.6 mL. Nutrition labels use a 240 mL 'legal cup', and many other countries use a 250 mL metric cup.
Frequently asked questions
How many US cups are in a US fluid ounce?
One US fluid ounce equals 0.125 US cups. Looking at it the other way, one US cup is 8 US fluid ounces. These are US customary measures.
How do you convert US fluid ounces to US cups?
Divide the number of US fluid ounces by 8. For example, 8 fl oz ÷ 8 = 1 cup.
What is 16 US fluid ounces in US cups?
16 fl oz is 2 cup (1 pint / water bottle).
How much is 64 US fluid ounces in US cups?
64 US fluid ounces equals 8 US cups.
How do I convert US cups back to US fluid ounces?
Multiply by 8, or press the ⇄ swap button above. For example, 2 cup × 8 = 16 fl oz.
How big is a cup in milliliters?
It depends on the country. A US customary cup is 236.6 mL, the 'legal' cup on US nutrition labels is 240 mL, and the metric cup used in Australia, Canada and many recipes is 250 mL. This converter uses the US customary cup.