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You are watching: How many fluid ounces in 3 gallons

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How many ounces are in a gallon?

The answer to how many ounces (fl oz) there are in a gallon depends on where in the world you are. The US liquid gallon measures less than the UK imperial gallon (3.785 liters compared to 4.546 litres). So, you should probably bear this in mind if you're considering changing your daily water intake, because there's a big difference between the two. You could be drinking 3/4 of a litre more water if you use the UK imperial gallon conversion.

When converting to ounces (fluid ounces), you also need to bear in mind that the US fluid ounce measures more than the UK imperial fluid ounce. The US fluid ounce measures 29.5735mL . By comparison, the UK (imperial) fluid ounce measures 28.4131mL. Here are the conversions you need:

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

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, see our water weight calculator.

Gallons to ounces conversion table (US)

Gallons (US) Fluid ounces (US)
1 gallon128 ounces
2 gallons256 ounces
3 gallons384 ounces
4 gallons512 ounces
5 gallons640 ounces
6 gallons768 ounces
7 gallons896 ounces
8 gallons1024 ounces
9 gallons1152 ounces
10 gallons1280 ounces
11 gallons1408 ounces
12 gallons1536 ounces
13 gallons1664 ounces
14 gallons1792 ounces
15 gallons1920 ounces

Gallons (UK) Fluid ounces (UK)
1 gallon160 ounces
2 gallons320 ounces
3 gallons480 ounces
4 gallons640 ounces
5 gallons800 ounces
6 gallons960 ounces
7 gallons1120 ounces
8 gallons1280 ounces
9 gallons1440 ounces
10 gallons1600 ounces
11 gallons1760 ounces
12 gallons1920 ounces
13 gallons2080 ounces
14 gallons2240 ounces
15 gallons2400 ounces

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