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
0.8359 gal to fl oz - 0.8359 US gallons = 106.9952 fluid ounces
0.3906 gal to fl oz - 0.3906 US gallons = 49.9968 fluid ounces
1.4063 gal to fl oz - 1.4063 US gallons = 180.0064 fluid ounces
0.7578 gal to fl oz - 0.7578 US gallons = 96.9984 fluid ounces
0.0625 gal to fl oz - 0.0625 US gallons = 8 fluid ounces
0.3594 gal to fl oz - 0.3594 US gallons = 46.0032 fluid ounces
1.4766 gal to fl oz - 1.4766 US gallons = 189.0048 fluid ounces
1.4531 gal to fl oz - 1.4531 US gallons = 185.9968 fluid ounces
2.5 gal to fl oz - 2.5 US gallons = 320 fluid ounces
1.5547 gal to fl oz - 1.5547 US gallons = 199.0016 fluid ounces
1.75 gal to fl oz - 1.75 US gallons = 224 fluid ounces
0.1641 gal to fl oz - 0.1641 US gallons = 21.0048 fluid ounces
0.4453 gal to fl oz - 0.4453 US gallons = 56.9984 fluid ounces
0.6406 gal to fl oz - 0.6406 US gallons = 81.9968 fluid ounces
0.8828 gal to fl oz - 0.8828 US gallons = 112.9984 fluid ounces
1.1094 gal to fl oz - 1.1094 US gallons = 142.0032 fluid ounces
0.7422 gal to fl oz - 0.7422 US gallons = 95.0016 fluid ounces
0.375 gal to fl oz - 0.375 US gallons = 48 fluid ounces
1.0859 gal to fl oz - 1.0859 US gallons = 138.9952 fluid ounces
1.5313 gal to fl oz - 1.5313 US gallons = 196.0064 fluid ounces
1.0938 gal to fl oz - 1.0938 US gallons = 140.0064 fluid ounces
1.625 gal to fl oz - 1.625 US gallons = 208 fluid ounces
8 gal to fl oz - 8 US gallons = 1024 fluid ounces
5 gal to fl oz - 5 US gallons = 640 fluid ounces
1.4688 gal to fl oz - 1.4688 US gallons = 188.0064 fluid ounces
1.6172 gal to fl oz - 1.6172 US gallons = 207.0016 fluid ounces
1.0156 gal to fl oz - 1.0156 US gallons = 129.9968 fluid ounces
0.7891 gal to fl oz - 0.7891 US gallons = 101.0048 fluid ounces
1.0078 gal to fl oz - 1.0078 US gallons = 128.9984 fluid ounces
0.5781 gal to fl oz - 0.5781 US gallons = 73.9968 fluid ounces
1.8203 gal to fl oz - 1.8203 US gallons = 232.9984 fluid ounces
0.0078 gal to fl oz - 0.0078 US gallons = 0.9984 fluid ounces
1.7266 gal to fl oz - 1.7266 US gallons = 221.0048 fluid ounces
1.0469 gal to fl oz - 1.0469 US gallons = 134.0032 fluid ounces
1.7422 gal to fl oz - 1.7422 US gallons = 223.0016 fluid ounces
0.2578 gal to fl oz - 0.2578 US gallons = 32.9984 fluid ounces
0.3438 gal to fl oz - 0.3438 US gallons = 44.0064 fluid ounces
0.6016 gal to fl oz - 0.6016 US gallons = 77.0048 fluid ounces
1.9063 gal to fl oz - 1.9063 US gallons = 244.0064 fluid ounces
1.8359 gal to fl oz - 1.8359 US gallons = 234.9952 fluid ounces
0.0313 gal to fl oz - 0.0313 US gallons = 4.0064 fluid ounces
1.1797 gal to fl oz - 1.1797 US gallons = 151.0016 fluid ounces
0.2734 gal to fl oz - 0.2734 US gallons = 34.9952 fluid ounces
0.4141 gal to fl oz - 0.4141 US gallons = 53.0048 fluid ounces
1.5703 gal to fl oz - 1.5703 US gallons = 200.9984 fluid ounces
0.9063 gal to fl oz - 0.9063 US gallons = 116.0064 fluid ounces
1.0234 gal to fl oz - 1.0234 US gallons = 130.9952 fluid ounces
0.3516 gal to fl oz - 0.3516 US gallons = 45.0048 fluid ounces
1.5859 gal to fl oz - 1.5859 US gallons = 202.9952 fluid ounces
0.2188 gal to fl oz - 0.2188 US gallons = 28.0064 fluid ounces
1.5391 gal to fl oz - 1.5391 US gallons = 197.0048 fluid ounces
0.0703 gal to fl oz - 0.0703 US gallons = 8.9984 fluid ounces
1.6016 gal to fl oz - 1.6016 US gallons = 205.0048 fluid ounces
0.8516 gal to fl oz - 0.8516 US gallons = 109.0048 fluid ounces
1.125 gal to fl oz - 1.125 US gallons = 144 fluid ounces
1.2891 gal to fl oz - 1.2891 US gallons = 165.0048 fluid ounces