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Fluid Ounces to Gallons Converter

Convert fluid ounces to gallons and gallons to fluid ounces instantly. Bidirectional volume converter with formula and common values.

fl oz

Gallons

0.5

gal

64 fl oz = 0.5 gal

gal = fl oz ÷ 128

Fluid Ounces to Gallons: 1 fl oz equals 0.007813 gal. To convert fluid ounces to gallons, multiply by 0.007813 (gal = fl oz ÷ 128). For example, 10 fl oz = 0.078125 gal.

How to Convert Fluid Ounces to Gallons

To convert from fluid ounces to gallons, multiply the value by 0.007813. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Fluid Ounces to Gallons: gal = fl oz ÷ 128
  • Gallons to Fluid Ounces: fl oz = gal × 128

Fluid Ounces to Gallons Conversion Chart

Fluid Ounces (fl oz)Gallons (gal)
0.10.000781
0.250.001953
0.50.003906
10.007813
20.015625
30.023438
50.039063
100.078125
200.15625
250.195313
500.390625
1000.78125
2501.953125
10007.8125

Understanding the Units

What is a Fluid Ounce?

The US fluid ounce equals exactly 29.5735295625 milliliters; the imperial fluid ounce is 28.4130625 milliliters.

Common contexts: beverages, cooking (US).

What is a Gallon?

The US liquid gallon equals exactly 3.785411784 liters; the imperial (UK) gallon equals 4.54609 liters.

From the Old Northern French galun, originally a wine measure.

Common contexts: fuel, milk, paint.

Real-World Reference Points

Item Fluid Ounces (fl oz) Gallons (gal)
A milk jug (US)1281
Average car gas tank (US)179214

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FAQ

How many gallons are in a fluid ounce?

One fluid ounce equals approximately 0.0078125 gallons (1/128 of a gallon).

How do I convert fluid ounces to gallons?

Divide the number of fluid ounces by 128. For example, 64 fl oz ÷ 128 = 0.5 gallons.

How many fluid ounces are in a gallon?

There are exactly 128 fluid ounces in one US gallon.

How many gallons is a standard water jug?

A common water jug holds 64 fl oz, which is exactly 0.5 gallons (a half gallon).

How many gallons are in 1 fluid ounc?

1 fl oz equals 0.007813 gal.

How do you convert fluid ounces to gallons?

Multiply the fluid ounc value by 0.007813. Formula: gal = fl oz ÷ 128.

How many gallons are in 5 fluid ounces?

5 fl oz = 0.039063 gal.

How do you convert gallons back to fluid ounces?

Use the inverse formula: fl oz = gal × 128. For example, 1 gal = 128 fl oz.

What is the difference between Fluid Ounc and Gallon?

The US fluid ounce equals exactly 29.5735295625 milliliters; the imperial fluid ounce is 28.4130625 milliliters. The US liquid gallon equals exactly 3.785411784 liters; the imperial (UK) gallon equals 4.54609 liters.