How Many Ounces (Oz or Fl Oz) Are in a Gallon?

On This Page:

• Conversion Formulas
• Conversion Examples
• Conversion Calculator
• Conversion Charts  

---

Conversion Formulas

When somebody asks how many ounces are in a gallon, note that a gallon is a unit of volume, hence the ounces are also 'fluid ounces' - very often labeled as 'fl oz'. Also, there are US Gallon, US Fluid Ounce, Imperial Gallon, and Imperial Fluid Ounce. Their relations are:

1 US Fluid Ounce (fl oz) = 1/128 US Liquid Gallon = 29.5735 milliliters

1 US Liquid Gallon = 128 US Fluid Ounces (fl oz) = 3.78541 liters

1 Imp Fluid Ounce = 1/160 Imp Liquid Gallon = 28.4131 milliliters

1 Imp Liquid Gallon = 160 Imp Fluid Ounces = 4.54609 liters

In order to convert volume given in gallons into volume given in ounces, use these formulas:

V_{(US fl oz)} = 128 * V_{(US gallon)}

V_{(Imp fl oz)} = 160 * V_{(Imp gallon)}

 

---

 

How Many Ounces Are in a Half Gallon of Water?

If You have a half gallons (US/Imp) of water, and want to know how many ounces is that, math is very simple:

V(US fl oz) = 128 * V(US gallon) = 128 * 0.5 = 64 US fl oz = 1892.7 ml = 1.8927 liters

V(Imp fl oz) = 160 * V(Imp gallon) = 160 * 0.5 = 80 Imp fl oz = 2273.0 ml = 2.273 liters

Similarly, if You have 2 gallons (US/Imp) that would be:

V_{(US fl oz)} = 128 * V_{(US gallon)} = 128 * 2 = 256 US fl oz = 7570.816 ml = 7.570816 liters

V_{(Imp fl oz)} = 160 * V_{(Imp gallon)} = 160 * 2 = 320 Imp fl oz = 9092.192 ml = 9.092192 liters  

 

---

 

Ounces to Gallons and Gallons to Ounces Conversion Calculator

In order to convert ounces to gallons and gallons to ounces, feel free to use this conversion calculator - write the value that You have and click 'Calculate' to convert it:

US Fluid Ounces to US Gallons

US Fluid Ounces: US Gallons:

US Gallons to US Fluid Ounces

US Gallons: US Fluid Ounces:

Imperial Fluid Ounces to Imperial Gallons

Imperial Fluid Ounces: Imperial Gallons:

Imperial Gallons to Imperial Fluid Ounces

Imperial Gallons: Imperial Fluid Ounces:

---

 

Ounces to Gallons Conversion Charts

Here are some ounces to gallons quick conversion charts to aid You with units' conversions:

US Fluid Ounces US Gallons 1 0.00781 10 0.07812 16 0.125 32 0.25 64 0.5 100 0.78125 128 1.0 250 1.953 256 2.0 500 3.906	US Gallons US Fluid Ounces 0.1 12.8 0.2 25.6 0.3 38.4 0.4 51.2 0.5 64 0.6 76.8 0.7 89.6 0.8 102.4 0.9 115.2 1.0 128
Imperial Fluid Ounces Imperial Gallons 1 0.00625 10 0.0625 16 0.1 32 0.2 64 0.4 100 0.625 160 1.0 250 1.5625 320 2.0 500 3.125	Imperial Gallons Imperial Fluid Ounces 0.1 16 0.2 32 0.3 48 0.4 64 0.5 80 0.6 96 0.7 112 0.8 128 0.9 144 1.0 160

For more values, please, use the conversion calculators.