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Oz to Gallons Converter (US Fluid Ounces to US Gallons)

1 US fluid ounce = 0.0078125 US gallons. To convert fl oz to gal, multiply by 0.0078125, or divide by 128.

⇄

100 fl oz = 0.7813 gal

1 fl oz
0.007813 gal
1 gal
128 fl oz
10 fl oz
0.07813 gal
100 fl oz
0.7813 gal

How to convert oz to Gallons

1 US fluid ounce equals 0.0078125 US gallons, so the conversion is a single multiplication.

gal = fl oz × 0.0078125

Example: 150 fl oz × 0.0078125 = 1.172 gal.

About the US fluid ounce and the US gallon

US Fluid Ounce (fl oz)

The US fluid ounce is 1/128 of a US gallon, about 29.57 mL. It's a volume unit, not a weight.

US Gallon (gal)

The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters. It's about 17% smaller than the imperial (UK) gallon.

1 US fluid ounce in every volume unit

Milliliters29.574 mLLiters0.02957 LUS Gallons0.007813 galUS Cups0.125 cup
Tablespoons2 tbsp
Teaspoons6 tsp
US Quarts0.03125 qt
US Pints0.0625 pt
Imperial Gallons0.006505 imp gal
Imperial Quarts0.02602 imp qt
Imperial Pints0.05204 imp pt
Imperial Fluid Ounces1.041 imp fl oz
Metric Cups0.1183 metric cup
Deciliters0.2957 dL
Centiliters2.957 cL
Cubic Meters0.00002957 m³
Cubic Centimeters29.574 cm³
Cubic Feet0.001044 ft³
Cubic Inches1.805 in³
Cubic Yards0.00003868 yd³
Oil Barrels0.000186 bbl
Acre-Feet2.398e-8 ac·ft
US Bushels0.0008392 bu
US Pecks0.003357 pk
US Dry Pints0.05371 dry pt
Gallons to ozReverse conversionml to oz1 mL = 0.03381 fl ozoz to ml1 fl oz = 29.5735 mLLiters to Gallons1 L = 0.2642 galGallons to Liters1 gal = 3.7854 LCups to oz1 cup = 8 fl ozoz to Cups1 fl oz = 0.125 cupQuarts to Gallons1 qt = 0.25 galGallons to Quarts1 gal = 4 qtLiters to oz1 L = 33.814 fl ozoz to Liters1 fl oz = 0.02957 LCubic Feet to Gallons1 ft³ = 7.4805 gal

Quick answers

How many ounces in a cup?8 US fluid ouncesHow many cups in a quart?4 US cupsHow many teaspoons in a tablespoon?3 teaspoonsHow many ounces in a gallon?128 US fluid ouncesHow many liters in a gallon?3.785 litersHow many quarts in a gallon?4 US quartsHow many tablespoons in 1/4 cup?4 tablespoons

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oz to Gallons FAQ

How many US gallons are in a US fluid ounce?

1 US fluid ounce = 0.0078125 US gallons.

How many US fluid ounces are in a US gallon?

1 US gallon = 128 US fluid ounces.

How do I convert fl oz to gal?

Use gal = fl oz × 0.0078125. For example, 10 fl oz = 0.07813 gal.

Can I print this oz to Gallons chart?

Yes. Use "Print / Save PDF" next to the converter for a one-page chart, or "Download CSV" to open it in Excel or Google Sheets.