US Gallons to US Fluid Ounces Converter
Convert US gallons (gal) to US fluid ounces (fl oz)
Result
128 fl oz
US Fluid Ounces
1 gal = 128 fl oz
1 gal in other units
- 1Enter a valueType the number to convert
- 2Pick the unitsChoose what to convert from and to
- 3Read the resultSee it in every other unit too
How to convert US gallons to US fluid ounces
One US gallon equals 128 US fluid ounces, so multiply the number of US gallons by 128.
fl oz = gal × 128
1 gal = 128 fl oz · 1 fl oz = 0.0078125 gal
Worked example
To convert 5 US gallons to US fluid ounces: 5 gal × 128 = 640 fl oz.
About US gallons (gal)
A US gallon is 128 US fluid ounces, about 3.785 litres. US fuel and milk are sold by the gallon.
About US fluid ounces (fl oz)
A US fluid ounce is about 29.57 mL. Drink and bottle sizes in the US use fluid ounces.
More conversions
US Gallons to other units
- US Gallons to Milliliters
- US Gallons to Liters
- US Gallons to Cubic Centimeters
- US Gallons to Cubic Meters
- US Gallons to Cubic Inches
- US Gallons to Cubic Feet
- US Gallons to Cubic Yards
- US Gallons to Teaspoons
- US Gallons to Tablespoons
- US Gallons to US Cups
- US Gallons to US Pints
- US Gallons to US Quarts
- US Gallons to Imperial Fluid Ounces
- US Gallons to Imperial Pints
- US Gallons to Imperial Gallons
Other units to US Fluid Ounces
- Milliliters to US Fluid Ounces
- Liters to US Fluid Ounces
- Cubic Centimeters to US Fluid Ounces
- Cubic Meters to US Fluid Ounces
- Cubic Inches to US Fluid Ounces
- Cubic Feet to US Fluid Ounces
- Cubic Yards to US Fluid Ounces
- Teaspoons to US Fluid Ounces
- Tablespoons to US Fluid Ounces
- US Cups to US Fluid Ounces
- US Pints to US Fluid Ounces
- US Quarts to US Fluid Ounces
- Imperial Fluid Ounces to US Fluid Ounces
- Imperial Pints to US Fluid Ounces
- Imperial Gallons to US Fluid Ounces
Frequently asked questions
How many US fluid ounces are in one US gallon?
One US gallon equals 128 US fluid ounces.
How many US gallons are in one US fluid ounce?
One US fluid ounce equals 0.0078125 US gallons.
How do I convert US gallons to US fluid ounces?
Use the formula fl oz = gal × 128. For example, 5 gal × 128 = 640 fl oz.