Fluid Ounces to Cups Converter

How to convert fluid ounces to cups

cups = fluid ounces ÷ 8

1 US fluid ounce is 1/128 US gallon. 1 US cup is exactly 8 US fluid ounces (half a US liquid pint).

The factor is exact in both directions: 1 fl oz = 0.125 cup and 1 cup = 8 fl oz. Nothing is rounded until you choose how many decimals to show.

Worked example: 20 fl oz

1. Start with the value in fluid ounces: 20 fl oz.
2. Divide by 8, because 1 cup = 8 fluid ounces: 20 ÷ 8 = 2.5 cups.

Fluid Ounces and cups side by side

Fluid Ounces to cups chart

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Fluid ounces from 1 to 64 converted to cups with the exact factor, shown to five significant digits.

Fluid Ounces to cups, part 1 of 4

fl oz	cup
1	0.125
2	0.25
3	0.375
4	0.5
5	0.625
6	0.75
7	0.875
8	1
9	1.125
10	1.25
11	1.375
12	1.5
13	1.625
14	1.75
15	1.875
16	2

Fluid Ounces to cups, part 2 of 4

fl oz	cup
17	2.125
18	2.25
19	2.375
20	2.5
21	2.625
22	2.75
23	2.875
24	3
25	3.125
26	3.25
27	3.375
28	3.5
29	3.625
30	3.75
31	3.875
32	4

Fluid Ounces to cups, part 3 of 4

fl oz	cup
33	4.125
34	4.25
35	4.375
36	4.5
37	4.625
38	4.75
39	4.875
40	5
41	5.125
42	5.25
43	5.375
44	5.5
45	5.625
46	5.75
47	5.875
48	6

Fluid Ounces to cups, part 4 of 4

fl oz	cup
49	6.125
50	6.25
51	6.375
52	6.5
53	6.625
54	6.75
55	6.875
56	7
57	7.125
58	7.25
59	7.375
60	7.5
61	7.625
62	7.75
63	7.875
64	8

cups = fluid ounces ÷ 8. Factors: NIST SP 811, NIST Handbook 44. unitcheck.net/cooking/fluid-ounces-to-cups/

Which cup, tablespoon and teaspoon?

All kitchen measures on this page are US customary: 1 cup is 8 US fluid ounces (236.5882365 mL), 1 tablespoon is half a fluid ounce (14.78676 mL) and 1 teaspoon is a third of a tablespoon (4.928922 mL). Cups and spoons sold in other countries can hold a different amount, so for a recipe written outside the United States check which measure the author means.

Going the other way? Use the Cups to Fluid Ounces converter.