Gallons to Ounces Conversion | How many ounces in a gallon?

There are 128 ounces in a gallon (128 oz in 1 gal) in US and 160 ounces in a gallon in UK. To find out how many ounces in "x" gallons, multiply the number of gallons "x" by 128 for US or 160 for UK.

To convert gallons to ounces you may also use the conversion tool below. Simply enter the volume in gallons into the converter and the result will be displayed. You may also check the gallons to ounces conversion table and create your own custom table.

1 Gallon [Fluid, US] = 128 Ounces [Fluid, US]
1 Gallon [Dry, US] = 148.946 Ounces [Fluid, US]
1 Gallon [UK] = 160 Ounces [UK]

There are 128 ounces in a gallon, because from the largest to the smallest units between gallons and ounces, there are 4 quarts in a gallon, 2 pints in a quart, 2 cups in a pint and 8 ounces in a cup, that makes 4 * 2 * 2 * 8 = 128 ounces in a gallon.

For example, to find out how many ounces there are in a gallon and a half, multiply the number of gallons by the conversion factor, that makes 1.5 gal * 128 = 192 ounces in 1.5 gallons.

Gallon and fluid ounce are US customary and imperial (UK) systems volume units. In US customary one gallon equals to 128 fl. ounces and in imperial (UK) system one gallon equals to 160 fl. ounces. The abbreviation for gallon is "gal" and for fluid ounce is "fl oz".

One US fluid gallon is defined as 231 cubic inches and one US dry gallon is 268.8 cubic inches. An imperial gallon is 277.4 cubic inches. One US fluid ounce equals to 29.5 mL and one imperial ounce equals to 28.4 mL.

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Gallons to Ounces Conversion Table [Fluid, US]

Gallon	Fl. Ounce	Gallon	Fl. Ounce	Gallon	Fl. Ounce	Gallon	Fl. Ounce
1	128	26	3328	51	6528	76	9728
2	256	27	3456	52	6656	77	9856
3	384	28	3584	53	6784	78	9984
4	512	29	3712	54	6912	79	10112
5	640	30	3840	55	7040	80	10240
6	768	31	3968	56	7168	81	10368
7	896	32	4096	57	7296	82	10496
8	1024	33	4224	58	7424	83	10624
9	1152	34	4352	59	7552	84	10752
10	1280	35	4480	60	7680	85	10880
11	1408	36	4608	61	7808	86	11008
12	1536	37	4736	62	7936	87	11136
13	1664	38	4864	63	8064	88	11264
14	1792	39	4992	64	8192	89	11392
15	1920	40	5120	65	8320	90	11520
16	2048	41	5248	66	8448	100	12800
17	2176	42	5376	67	8576	125	16000
18	2304	43	5504	68	8704	150	19200
19	2432	44	5632	69	8832	175	22400
20	2560	45	5760	70	8960	200	25600
21	2688	46	5888	71	9088	250	32000
22	2816	47	6016	72	9216	300	38400
23	2944	48	6144	73	9344	500	64000
24	3072	49	6272	74	9472	750	96000
25	3200	50	6400	75	9600	1000	128000