Gallons to Ounces
Gallons to Grams
Liters to Gallons
Convert from:
US Gallons
US Ounces
UK Gallons
UK Ounces
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Conversion Result

Convert from US gallons or UK gallons to fluid ounces using the conversion tool and chart.

Disclaimer: Whilst every effort has been made in building our calculator tools, we are not to be held liable for any damages or monetary losses arising out of or in connection with their use. Full disclaimer.

How many ounces are in a gallon?

There are 128 US fluid ounces in a US gallon. If you're in the UK, you'll find a gallon measures 160 UK fluid ounces. This is due to the fact that the US liquid gallon is smaller than the UK imperial gallon (3.785 liters compared to 4.546 liters).

When converting gallons to ounces (fluid ounces), you should also bear in mind that the US fluid ounce is larger than the UK imperial fluid ounce. The US fluid ounce measures 29.5735mL. By comparison, the UK (imperial) fluid ounce measures 28.4131mL. So the US has a smaller gallon than the UK, but a slightly larger fluid ounce. It's enough to cause your head to explode. When it comes to conversions between the two, here's the info you need:

  • 1 Gallon (US) = 128 Ounces (US, Fluid)
  • 1 Gallon (UK) = 160 Ounces (UK, Fluid)

You should probably bear the size differences in mind if you're considering changing your daily water intake, because there's a big difference between the two. You could be drinking 1/4 of a litre more water if you use the UK imperial gallon conversion. If you're interested in the weight of a gallon of water, by the way, you can find out how much a gallon of water weighs here.

How many ounces are in a gallon of water?

In the US, a gallon of water measures 128 fluid ounces. In the UK, a gallon of water measures 160 fluid ounces. This is because the US and UK use different measurements for gallons and fluid ounces.

As a side note, if you're looking to convert gallons of water into pounds or ounces of weight, give our water weight calculator a try.

How many gallons does 64 ounces equal?

A gallon of liquid in the United States equates to 128 US fluid ounces. This means that 64 US fluid ounces measures the same as 1/2 a US gallon.

Is 1 gallon the same as 64 oz?

No. A gallon of liquid contains 128 US fluid ounces. This means that half a gallon measures 64 US fluid ounces.

How many 32 oz make a gallon?

If you're referencing the US gallon (128 US fluid ounces), you would therefore need 4 × 32oz to make a gallon. You would therefore need four 32oz bottles.

Gallons to ounces chart (US)

Gallons to fl oz (US)Gallons to fl oz (US)

Conversions are rounded to max 3 decimal places.

Gallons to imperial fluid ounces (UK)

Due to the fact that the UK uses the smaller imperial fluid ounce, conversions for UK gallons are as follows.

Gallons to fl oz (UK)Gallons to fl oz (UK)

Conversions are rounded to max 3 decimal places.

If you wish to convert liters to gallons, you can do so with our liters to gallons calculator.

If you have any problems using our gallons to ounces converter, please contact us.