How many Fluid Ounce (US) are in 1 Gallon (US)?

One gallon (us) equals 128.000068 fluid ounce (us).

Can I convert Fluid Ounce (US) back to Gallon (US)?

Yes. Enter a value in either field to convert from Gallon (US) (gal) to Fluid Ounce (US) (fl oz) or the reverse — results update instantly.

Gallon (US) to Fluid Ounce (US) Converter

gal → fl oz

Convert between liters, gallons, cups, milliliters, ounces, and more volume units

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How to Convert Gallon (US) to Fluid Ounce (US)

Enter a value above, select your units, and get instant results. Works both ways — Gallon (US) to Fluid Ounce (US) or Fluid Ounce (US) to Gallon (US).

Formula: Fluid Ounce (US) = Gallon (US) × 128.000068

Quick steps

Enter the value you want to convert in the "Gallon (US)" field.
Select "Gallon (US)" as your "From" unit.
Select "Fluid Ounce (US)" as your "To" unit.
The converted result appears instantly in the "Fluid Ounce (US)" field.
To reverse the conversion, enter a value in the "Fluid Ounce (US)" field instead.

Common Gallon (US) to Fluid Ounce (US) Conversions

Gallon (US)	Fluid Ounce (US)
1	128.000068
5	640.000338
10	1,280.000676
25	3,200.001691
50	6,400.003381
100	12,800.006763

Frequently Asked Questions

Multiply your gallon (us) value by 128.000068. For example, 10 gal = 1,280.000676 fl oz.

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Convert Gallon (US) to Fluid Ounce (US)