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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

How to Convert Fluid Ounces to Gallons

To convert fluid ounces to gallons, divide by 128. Since one US gallon contains 128 fluid ounces, dividing by 128 yields the gallon equivalent.

Conversion Formula

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

Common Conversions

Fluid OuncesGallons
160.125
320.25
640.5
960.75
1281
1921.5
2562

Related

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).