Convert US Gallon (gal) to Fluid Ounce (fl oz) instantly. Enter any value — result updates live.
Converting US Gallon to Fluid Ounce is a common volume conversion. One us gallon (gal) equals 128 fluid ounce (fl oz). US gallons are used for fuel, beverages, and liquid storage in the United States.
This conversion is commonly needed for cooking and baking recipes, fuel and vehicle maintenance, aquarium and pool sizing. Fluid ounces measure liquid volumes for beverages, cosmetics, and medicine in the US.
To put us gallon in perspective: a large milk jug (1 gal). In fluid ounce, common references include a standard soda can (12 fl oz).
A US gallon (3.785 L) is different from an Imperial gallon (4.546 L), which can cause confusion in international recipes.
Despite sharing a name, the US fluid ounce (29.57 mL) and UK fluid ounce (28.41 mL) differ by about 4%, a quirk of divergent imperial standards after the US and UK measurement systems split in the 19th century.
People frequently convert between us gallon and fluid ounce for:
| US Gallon (gal) | Fluid Ounce (fl oz) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1,280 fl oz |
| 15 gal | 1,920 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 fl oz |
| 30 gal | 3,840 fl oz |
| 50 gal | 6,400 fl oz |
| 100 gal | 13,000 fl oz |
| 200 gal | 26,000 fl oz |
| 500 gal | 64,000 fl oz |
| 1000 gal | 130,000 fl oz |