How Many Fl Oz in a Gallon?
Convert US Gallons to Fluid Ounces
How Many Fl Oz in a Gallon?
How to Convert Gallons to Fluid Ounces
Gallons to Fluid Ounces Conversion Formula
To convert US gallons to fluid ounces, use this simple formula:
fluid ounces = gallons × 128
By definition one US gallon contains exactly 128 US fluid ounces. It is made up of 4 quarts, each of 32 fluid ounces. These are volume units, distinct from weight ounces.
Step-by-Step Volume Conversion Guide
- Take your volume in US gallons
- Multiply it by 128 (the number of fluid ounces in one gallon)
- Get your result in fluid ounces
Common Gallons to Fluid Ounces Conversions
| US Gallons (gal) | Fluid Ounces (fl oz) |
|---|---|
| 0.25 gal | 32 fl oz |
| 0.5 gal | 64 fl oz |
| 0.75 gal | 96 fl oz |
| 1 gal | 128 fl oz |
| 1.5 gal | 192 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 5 gal | 640 fl oz |
Practical Applications of Gallons to Fl Oz Converter
- Beverages: Portioning a gallon of drink into fluid-ounce servings
- Cleaning: Preparing dilutions dosed in ounces per gallon
- Aquariums: Adding treatments measured in fluid ounces to tanks sized in gallons
- Cooking: Breaking large-batch recipes into smaller measures
- Retail: Comparing container sizes labeled in gallons and ounces
History of the Gallon and Fluid Ounce
The US gallon is based on the old English wine gallon of 231 cubic inches and equals 3.785 liters. It divides neatly into 128 fluid ounces, 8 pints or 4 quarts. This 1:128 relationship makes gallon-to-ounce conversions simple, unlike the imperial gallon which contains 160 imperial fluid ounces.
Quick Conversion Tips
For quick reference, remember: 1 gallon = 128 fl oz, ½ gallon = 64 fl oz and 1 quart = 32 fl oz. To convert gallons to fluid ounces, multiply by 128.
See Also
- Ml to Oz - Convert Milliliters to Fluid Ounces
- Oz to Ml - Convert Fluid Ounces to Milliliters
- Oz to Cups - Convert Fluid Ounces to Cups
- Cups to Oz - Convert Cups to Fluid Ounces
- Liters to Gallons - Convert Liters to US Gallons
- Gallons to Liters - Convert US Gallons to Liters
- Cups to Ml - Convert Cups to Milliliters
- Ml to Cups - Convert Milliliters to Cups
- Tablespoons to Cups - Convert Tablespoons to Cups
- Cups to Tablespoons - Convert Cups to Tablespoons
- Tsp to Ml - Convert Teaspoons to Milliliters
- Ml to Tsp - Convert Milliliters to Teaspoons
- Fl Oz to Liters - Convert Fluid Ounces to Liters
- Liters to Fl Oz - Convert Liters to Fluid Ounces
- Quarts to Liters - Convert US Quarts to Liters
- Liters to Quarts - Convert Liters to US Quarts
- Ml to L - Convert Milliliters to Liters
- L to Ml - Convert Liters to Milliliters
- Cups to L - Convert Cups to Liters
- L to Cups - Convert Liters to Cups
- Fl Oz to Gal - Convert Fluid Ounces to US Gallons
- Gal to Ml - Convert Gallons to Milliliters
- Ml to Gal - Convert Milliliters to Gallons
- Quarts to Gallons - Convert Quarts to Gallons
- Gallons to Quarts - Convert Gallons to Quarts
- Cc to Ml - Convert Cubic Centimeters to Milliliters
- Ml to Cc - Convert Milliliters to Cubic Centimeters
- L to UK Gallons - Convert Liters to UK Gallons
- UK Gallons to L - Convert UK Gallons to Liters
- L to Cubic Meters - Convert Liters to Cubic Meters
- Cubic Meters to L - Convert Cubic Meters to Liters
Last Results
0.7344 gal to fl oz - 0.7344 US gallons = 94.0032 fluid ounces
1.1406 gal to fl oz - 1.1406 US gallons = 145.9968 fluid ounces
0.9609 gal to fl oz - 0.9609 US gallons = 122.9952 fluid ounces
0.2031 gal to fl oz - 0.2031 US gallons = 25.9968 fluid ounces
0.3672 gal to fl oz - 0.3672 US gallons = 47.0016 fluid ounces
1.3594 gal to fl oz - 1.3594 US gallons = 174.0032 fluid ounces
0.8516 gal to fl oz - 0.8516 US gallons = 109.0048 fluid ounces
0.125 gal to fl oz - 0.125 US gallons = 16 fluid ounces
0.2578 gal to fl oz - 0.2578 US gallons = 32.9984 fluid ounces
0.4063 gal to fl oz - 0.4063 US gallons = 52.0064 fluid ounces
0.2422 gal to fl oz - 0.2422 US gallons = 31.0016 fluid ounces
3 gal to fl oz - 3 US gallons = 384 fluid ounces
1.1953 gal to fl oz - 1.1953 US gallons = 152.9984 fluid ounces
1.9219 gal to fl oz - 1.9219 US gallons = 246.0032 fluid ounces
0.8984 gal to fl oz - 0.8984 US gallons = 114.9952 fluid ounces
1.7031 gal to fl oz - 1.7031 US gallons = 217.9968 fluid ounces
1.5391 gal to fl oz - 1.5391 US gallons = 197.0048 fluid ounces
0.6719 gal to fl oz - 0.6719 US gallons = 86.0032 fluid ounces
10 gal to fl oz - 10 US gallons = 1280 fluid ounces
1 gal to fl oz - 1 US gallons = 128 fluid ounces
0.9141 gal to fl oz - 0.9141 US gallons = 117.0048 fluid ounces
1.6641 gal to fl oz - 1.6641 US gallons = 213.0048 fluid ounces
0.3906 gal to fl oz - 0.3906 US gallons = 49.9968 fluid ounces
1.2891 gal to fl oz - 1.2891 US gallons = 165.0048 fluid ounces
0.1484 gal to fl oz - 0.1484 US gallons = 18.9952 fluid ounces
0.4922 gal to fl oz - 0.4922 US gallons = 63.0016 fluid ounces
1.8438 gal to fl oz - 1.8438 US gallons = 236.0064 fluid ounces
0.0078 gal to fl oz - 0.0078 US gallons = 0.9984 fluid ounces
2 gal to fl oz - 2 US gallons = 256 fluid ounces
1.7891 gal to fl oz - 1.7891 US gallons = 229.0048 fluid ounces
0.2266 gal to fl oz - 0.2266 US gallons = 29.0048 fluid ounces
0.0859 gal to fl oz - 0.0859 US gallons = 10.9952 fluid ounces
1.0313 gal to fl oz - 1.0313 US gallons = 132.0064 fluid ounces
1.2422 gal to fl oz - 1.2422 US gallons = 159.0016 fluid ounces
0.4688 gal to fl oz - 0.4688 US gallons = 60.0064 fluid ounces
1.5625 gal to fl oz - 1.5625 US gallons = 200 fluid ounces
1.0469 gal to fl oz - 1.0469 US gallons = 134.0032 fluid ounces
1.3906 gal to fl oz - 1.3906 US gallons = 177.9968 fluid ounces
0.1016 gal to fl oz - 0.1016 US gallons = 13.0048 fluid ounces
0.7891 gal to fl oz - 0.7891 US gallons = 101.0048 fluid ounces
0.0313 gal to fl oz - 0.0313 US gallons = 4.0064 fluid ounces
0.7969 gal to fl oz - 0.7969 US gallons = 102.0032 fluid ounces
1.2031 gal to fl oz - 1.2031 US gallons = 153.9968 fluid ounces
1.4375 gal to fl oz - 1.4375 US gallons = 184 fluid ounces
0.4141 gal to fl oz - 0.4141 US gallons = 53.0048 fluid ounces
0.6094 gal to fl oz - 0.6094 US gallons = 78.0032 fluid ounces
0.7422 gal to fl oz - 0.7422 US gallons = 95.0016 fluid ounces
1.9688 gal to fl oz - 1.9688 US gallons = 252.0064 fluid ounces
1.5938 gal to fl oz - 1.5938 US gallons = 204.0064 fluid ounces
1.8516 gal to fl oz - 1.8516 US gallons = 237.0048 fluid ounces
1.6406 gal to fl oz - 1.6406 US gallons = 209.9968 fluid ounces
1.9609 gal to fl oz - 1.9609 US gallons = 250.9952 fluid ounces
1.5 gal to fl oz - 1.5 US gallons = 192 fluid ounces
0.875 gal to fl oz - 0.875 US gallons = 112 fluid ounces
0.5078 gal to fl oz - 0.5078 US gallons = 64.9984 fluid ounces
1.5859 gal to fl oz - 1.5859 US gallons = 202.9952 fluid ounces