How to convert us gallons to us fluid ounces
To convert a measurement in us gallons to us fluid ounces, multiply the value by 128. The conversion factor comes from the relationship between both units and the liter.
For example, to convert 5 gal to us fluid ounces: 5 × 128 = 640 fl oz.
What is a us gallon?
A US gallon is a US customary unit of volume equal to 4 quarts, 128 fluid ounces, or exactly 3.785411784 liters. The US gallon is based on the old English wine gallon of 231 cubic inches. It is smaller than the imperial gallon used in the UK and Commonwealth, a frequent source of fuel-economy confusion.
Common uses of us gallons include: Fuel sold at the pump in the US; Milk, water, and beverage jug sizes; Paint and household liquid quantities; Vehicle fuel-economy figures (miles per gallon).
What is a us fluid ounce?
A US fluid ounce is a US customary unit of liquid volume equal to 1/8 of a cup or about 29.57 milliliters. The fluid ounce measures volume, not weight, and the US version differs from the slightly smaller imperial fluid ounce (about 28.4 mL). It is the standard unit for labeling drink and cosmetic volumes in the US.
Common uses of us fluid ounces include: Drink and beverage container labeling in the US; Cosmetic and personal-care product volumes; Recipe liquid quantities; Bar and cocktail measurements.
US Gallons to us fluid ounces worked examples
Here are some common values converted:
1 gal = 128 fl oz 5 gal = 640 fl oz 10 gal = 1,280 fl oz 50 gal = 6,400 fl oz 100 gal = 12,800 fl oz
Frequently asked questions
How many us fluid ounces are in one us gallon?
One us gallon (gal) equals 128 us fluid ounces (fl oz). Multiply any value in us gallons by 128 to convert to us fluid ounces.
How do I convert us gallons to us fluid ounces?
Multiply the value in us gallons by 128. For example, 5 gal × 128 = 640 fl oz.
How do I convert us fluid ounces to us gallons?
Multiply the value in us fluid ounces by 0.0078125, or divide by 128. Use the swap button on the converter above to reverse the direction.
Is the us gallon to us fluid ounce conversion exact?
Conversions between metric volumes are exact by definition. US and imperial volumes are defined exactly relative to the liter, so these factors are exact.
What is the formula for us gallons to us fluid ounces?
The formula is: fl oz = gal × 128. This comes from the definition of both units relative to the liter.