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How many ounces in a gallon?
1 gallon = 128 fl oz
There are 128 fluid ounces in a gallon.
How to work it out
1 × 128 = 128
Formula: fl oz = gal × 128
Other ways to write it
- In liters
- 3.7854 L
- In milliliters
- 3,785.4 ml
- In quarts
- 4 qt
- In pints
- 8 pt
- In cups
- 16 cups
- In tablespoons
- 256 tbsp
- In teaspoons
- 768 tsp
A fluid ounce measures volume. A dry ounce (weight) is different: 1 oz = 28.35 grams, while 1 fl oz of water weighs about 29.6 grams.
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About the Unit Converter
The unit converter changes values between metric and imperial units for length, weight, temperature, digital data, area, and volume.
How to use it
- 1 Choose a category, such as length or temperature.
- 2 Pick the unit to convert from and the unit to convert to.
- 3 Type a value to see the converted result straight away.
Frequently asked questions
How many ounces in a gallon?
There are 128 fluid ounces in a gallon. Multiply by 128: there are 128 fluid ounces in one gallon.
Are these US or UK measurements?
They are US customary measures: a US cup is 236.6 ml, a US fluid ounce 29.57 ml and a US gallon 3.785 liters. A UK (imperial) pint is 568 ml and a UK gallon 4.546 liters.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 20 °C × 9/5 + 32 = 68 °F.
How many centimetres are in an inch?
One inch is exactly 2.54 centimetres, and one foot is 30.48 centimetres.
Is a kilobyte 1,000 or 1,024 bytes?
In SI units a kilobyte (kB) is 1,000 bytes. A kibibyte (KiB) is 1,024 bytes. Some operating systems still use "KB" to mean 1,024 bytes.