A quick two-way fl oz ⇄ gal converter: type in either box, choose how many decimals you want and copy the answer with one click.
fl oz
gal
Step-by-step calculation
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How to use the Ounces to Gallons Converter
Type a value in the Fluid ounces (US) box. The gallons (US) result appears instantly.
Going the other way? Type in the Gallons (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 gallons (US) formula
gal = fl oz ÷ 128
Take the value in US fluid ounces.
Divide it by 128 (the number of US fluid ounces in one US gallon).
Example: 128 fl oz ÷ 128 = 1 gal.
Reverse formula (US gallons to US fluid ounces): fl oz = gal × 128. Example: 0.09375 gal × 128 = 12 fl oz.
The factor is a whole number (128), so this one is easy to do in your head or with long division.
fl oz to gal conversion table (1–100)
Click any row to load it into the converter.
Fluid ounces (US) to gallons (US)
Fluid ounces (US)
Gallons (US)
1 fl oz
0.00781 gal
2 fl oz
0.01562 gal
3 fl oz
0.02344 gal
4 fl oz
0.03125 gal
5 fl oz
0.03906 gal
6 fl oz
0.04688 gal
7 fl oz
0.05469 gal
8 fl oz
0.0625 gal
9 fl oz
0.07031 gal
10 fl oz
0.07812 gal
11 fl oz
0.08594 gal
12 fl oz
0.09375 gal
13 fl oz
0.10156 gal
14 fl oz
0.10938 gal
15 fl oz
0.11719 gal
16 fl oz
0.125 gal
17 fl oz
0.13281 gal
18 fl oz
0.14062 gal
19 fl oz
0.14844 gal
20 fl oz
0.15625 gal
21 fl oz
0.16406 gal
22 fl oz
0.17188 gal
23 fl oz
0.17969 gal
24 fl oz
0.1875 gal
25 fl oz
0.19531 gal
26 fl oz
0.20312 gal
27 fl oz
0.21094 gal
28 fl oz
0.21875 gal
29 fl oz
0.22656 gal
30 fl oz
0.23438 gal
31 fl oz
0.24219 gal
32 fl oz
0.25 gal
33 fl oz
0.25781 gal
34 fl oz
0.26562 gal
35 fl oz
0.27344 gal
36 fl oz
0.28125 gal
37 fl oz
0.28906 gal
38 fl oz
0.29688 gal
39 fl oz
0.30469 gal
40 fl oz
0.3125 gal
41 fl oz
0.32031 gal
42 fl oz
0.32812 gal
43 fl oz
0.33594 gal
44 fl oz
0.34375 gal
45 fl oz
0.35156 gal
46 fl oz
0.35938 gal
47 fl oz
0.36719 gal
48 fl oz
0.375 gal
49 fl oz
0.38281 gal
50 fl oz
0.39062 gal
51 fl oz
0.39844 gal
52 fl oz
0.40625 gal
53 fl oz
0.41406 gal
54 fl oz
0.42188 gal
55 fl oz
0.42969 gal
56 fl oz
0.4375 gal
57 fl oz
0.44531 gal
58 fl oz
0.45312 gal
59 fl oz
0.46094 gal
60 fl oz
0.46875 gal
61 fl oz
0.47656 gal
62 fl oz
0.48438 gal
63 fl oz
0.49219 gal
64 fl oz
0.5 gal
65 fl oz
0.50781 gal
66 fl oz
0.51562 gal
67 fl oz
0.52344 gal
68 fl oz
0.53125 gal
69 fl oz
0.53906 gal
70 fl oz
0.54688 gal
71 fl oz
0.55469 gal
72 fl oz
0.5625 gal
73 fl oz
0.57031 gal
74 fl oz
0.57812 gal
75 fl oz
0.58594 gal
76 fl oz
0.59375 gal
77 fl oz
0.60156 gal
78 fl oz
0.60938 gal
79 fl oz
0.61719 gal
80 fl oz
0.625 gal
81 fl oz
0.63281 gal
82 fl oz
0.64062 gal
83 fl oz
0.64844 gal
84 fl oz
0.65625 gal
85 fl oz
0.66406 gal
86 fl oz
0.67188 gal
87 fl oz
0.67969 gal
88 fl oz
0.6875 gal
89 fl oz
0.69531 gal
90 fl oz
0.70312 gal
91 fl oz
0.71094 gal
92 fl oz
0.71875 gal
93 fl oz
0.72656 gal
94 fl oz
0.73438 gal
95 fl oz
0.74219 gal
96 fl oz
0.75 gal
97 fl oz
0.75781 gal
98 fl oz
0.76562 gal
99 fl oz
0.77344 gal
100 fl oz
0.78125 gal
Gallons (US) to fluid ounces (US)
Gallons (US)
Fluid ounces (US)
1 gal
128 fl oz
2 gal
256 fl oz
3 gal
384 fl oz
4 gal
512 fl oz
5 gal
640 fl oz
6 gal
768 fl oz
7 gal
896 fl oz
8 gal
1,024 fl oz
9 gal
1,152 fl oz
10 gal
1,280 fl oz
11 gal
1,408 fl oz
12 gal
1,536 fl oz
13 gal
1,664 fl oz
14 gal
1,792 fl oz
15 gal
1,920 fl oz
16 gal
2,048 fl oz
17 gal
2,176 fl oz
18 gal
2,304 fl oz
19 gal
2,432 fl oz
20 gal
2,560 fl oz
21 gal
2,688 fl oz
22 gal
2,816 fl oz
23 gal
2,944 fl oz
24 gal
3,072 fl oz
25 gal
3,200 fl oz
26 gal
3,328 fl oz
27 gal
3,456 fl oz
28 gal
3,584 fl oz
29 gal
3,712 fl oz
30 gal
3,840 fl oz
31 gal
3,968 fl oz
32 gal
4,096 fl oz
33 gal
4,224 fl oz
34 gal
4,352 fl oz
35 gal
4,480 fl oz
36 gal
4,608 fl oz
37 gal
4,736 fl oz
38 gal
4,864 fl oz
39 gal
4,992 fl oz
40 gal
5,120 fl oz
41 gal
5,248 fl oz
42 gal
5,376 fl oz
43 gal
5,504 fl oz
44 gal
5,632 fl oz
45 gal
5,760 fl oz
46 gal
5,888 fl oz
47 gal
6,016 fl oz
48 gal
6,144 fl oz
49 gal
6,272 fl oz
50 gal
6,400 fl oz
51 gal
6,528 fl oz
52 gal
6,656 fl oz
53 gal
6,784 fl oz
54 gal
6,912 fl oz
55 gal
7,040 fl oz
56 gal
7,168 fl oz
57 gal
7,296 fl oz
58 gal
7,424 fl oz
59 gal
7,552 fl oz
60 gal
7,680 fl oz
61 gal
7,808 fl oz
62 gal
7,936 fl oz
63 gal
8,064 fl oz
64 gal
8,192 fl oz
65 gal
8,320 fl oz
66 gal
8,448 fl oz
67 gal
8,576 fl oz
68 gal
8,704 fl oz
69 gal
8,832 fl oz
70 gal
8,960 fl oz
71 gal
9,088 fl oz
72 gal
9,216 fl oz
73 gal
9,344 fl oz
74 gal
9,472 fl oz
75 gal
9,600 fl oz
76 gal
9,728 fl oz
77 gal
9,856 fl oz
78 gal
9,984 fl oz
79 gal
10,112 fl oz
80 gal
10,240 fl oz
81 gal
10,368 fl oz
82 gal
10,496 fl oz
83 gal
10,624 fl oz
84 gal
10,752 fl oz
85 gal
10,880 fl oz
86 gal
11,008 fl oz
87 gal
11,136 fl oz
88 gal
11,264 fl oz
89 gal
11,392 fl oz
90 gal
11,520 fl oz
91 gal
11,648 fl oz
92 gal
11,776 fl oz
93 gal
11,904 fl oz
94 gal
12,032 fl oz
95 gal
12,160 fl oz
96 gal
12,288 fl oz
97 gal
12,416 fl oz
98 gal
12,544 fl oz
99 gal
12,672 fl oz
100 gal
12,800 fl oz
Common values
Fluid ounces (US)
Gallons (US)
Example
0.5 fl oz
0.00391 gal
1 tablespoon
1 fl oz
0.01 gal
1 fl oz (shot)
2 fl oz
0.02 gal
2 fl oz
4 fl oz
0.03 gal
Half cup
6 fl oz
0.05 gal
6 fl oz
8 fl oz
0.06 gal
1 cup
12 fl oz
0.09 gal
Can of soda
16 fl oz
0.12 gal
1 pint / water bottle
20 fl oz
0.16 gal
20 fl oz bottle
32 fl oz
0.25 gal
1 quart
64 fl oz
0.5 gal
Half gallon
128 fl oz
1 gal
1 gallon
About fluid ounces (US) and gallons (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.
Gallons (US) (gal). The US liquid gallon is exactly 231 cubic inches, about 3.785 liters. The UK imperial gallon is larger, about 4.546 liters.
Frequently asked questions
1 US fluid ounce equals how many US gallons?
One US fluid ounce equals 0.0078125 US gallons. Looking at it the other way, one US gallon is 128 US fluid ounces. These are US customary measures.
How do you convert US fluid ounces to US gallons?
Divide the number of US fluid ounces by 128. For example, 128 fl oz ÷ 128 = 1 gal.
What is 12 US fluid ounces in US gallons?
12 fl oz is 0.09375 gal (can of soda).
How do I convert US gallons back to US fluid ounces?
Multiply by 128, or press the ⇄ swap button above. For example, 0.09375 gal × 128 = 12 fl oz.
Are US and UK gallons the same?
No. The US liquid gallon is 3.785 liters, while the UK imperial gallon is 4.546 liters, about 20% larger. US quarts and pints are smaller than imperial ones for the same reason. This converter uses US liquid measures.
What is the difference between US and UK fluid ounces?
A US fluid ounce is 29.57 mL and a UK imperial fluid ounce is 28.41 mL. There are 16 US fl oz in a US pint but 20 imperial fl oz in a UK pint. This converter uses US fluid ounces.