How Many Fluid Ounces in a Gallon

1 gal = 128 fl oz

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

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

There are 128 US fluid ounces in a US gallon and 160 in UK 

The formula divides the number of ounces into sets of 128 to determine the number of gallons. Let’s use this as our example.

Step 1:

The formula for seeing how many fluid ounces are in a gallon:

  • x ounces / 128 = y gallons

Step 2:

Substitute known values into the formula. Here the number of ounces is 19,200.

  • 19,200 / 128 = y

Step 3:

Compute the answer.

  • 150 = y

How many gallons does 64 ounces equal?

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 and US fluid ounce, 32 ounces equal one quart and equate to 1/4 of a gallon. You would therefore need 4 to make a US gallon.

Gallons to ounces conversions (US)

Gallons to fl oz (US) Gallons to fl oz (US)
1/4 gallon = 32 fl oz 10 gallons = 1280 fl oz
1/2 gallon = 64 fl oz 11 gallons = 1408 fl oz
3/4 gallon = 96 fl oz 12 gallons = 1536 fl oz
1 gallon = 128 fl oz 13 gallons = 1664 fl oz
2 gallons = 256 fl oz 14 gallons = 1792 fl oz
3 gallons = 384 fl oz 15 gallons = 1920 fl oz
4 gallons = 512 fl oz 16 gallons = 2048 fl oz
5 gallons = 640 fl oz 17 gallons = 2176 fl oz
6 gallons = 768 fl oz 18 gallons = 2304 fl oz
7 gallons = 896 fl oz 19 gallons = 2432 fl oz
8 gallons = 1024 fl oz 20 gallons = 2560 fl oz
9 gallons = 1152 fl oz 21 gallons = 2688 fl oz
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)
1 gallon = 160 fl oz 11 gallon = 1760 fl oz
2 gallons = 320 fl oz 12 gallon = 1920 fl oz
3 gallons = 480 fl oz 13 gallon = 2080 fl oz
4 gallons = 640 fl oz 14 gallon = 2240 fl oz
5 gallons = 800 fl oz 15 gallon = 2400 fl oz
6 gallons = 960 fl oz 16 gallon = 2560 fl oz
7 gallons = 1120 fl oz 17 gallon = 2720 fl oz
8 gallons = 1280 fl oz 18 gallon = 2880 fl oz
9 gallons = 1440 fl oz 19 gallon = 3040 fl oz
10 gallons = 1600 fl oz 20 gallon = 3200 fl oz
Conversions are rounded to max 3 decimal places

How Many Fluid Ounces in a Gallon

How Many Fluid Ounces in a Gallon
How Many Fluid Ounces in a Gallon

FAQ

Is 1 gallon the same as 64 oz?
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