How many Fluid Ounce (fl oz) are in one Gallon US (gal)?

1 gal equals 128.00007 fl oz. Multiply your Gallon US (gal) value by 128.00007 to get Fluid Ounce (fl oz).

How do I convert Gallon US (gal) to Fluid Ounce (fl oz)?

Use the formula fl oz = gal × 128.00007. For example, 10 gal = 1,280.0007 fl oz.

What is 12,800.007 fl oz in Gallon US (gal)?

12,800.007 fl oz equals 100 gal.

Koverts/Volume/gal → fl oz

🧪 Volume Converter

Gallon US (gal) to Fluid Ounce (fl oz)

1 gal = 128.00007 fl oz · Free instant converter, no signup required.

Direct Answer

1 gal = 128.00007 fl oz

Formula: fl oz = gal × 128.00007. This page supports instant conversion, reference table checks, and related unit links.

About this conversion

This Koverts page converts Gallon US (gal) to Fluid Ounce (fl oz). It uses the same rules as our Volume Converter — reliable Volume conversions, free and instant.

Gallon US (gal) and Fluid Ounce (fl oz) are units used in Volume Converter. Enter a value above to convert Gallon US (gal) into Fluid Ounce (fl oz) using the standard relationship for this category.

Fluid Ounce (fl oz) is the target unit on this page. Results come from Gallon US (gal) using the same rules as the calculator and the reference table below.

Typical uses

Compare Gallon US (gal) and Fluid Ounce (fl oz) for everyday estimates and planning
Use with homework, DIY projects, and hobby measurements
Read international labels, manuals, and product specs with less guesswork
Educational reference only — verify medical, legal, or engineering use with authoritative sources

Formulafl oz = gal × 128.00007

Common reference values

1 gal = 128.00007 fl oz
10 gal = 1,280.0007 fl oz
100 gal = 12,800.007 fl oz

Tip: 1 gal equals 128.00007 fl oz. Multiply your amount by 128.00007 to convert from gal to fl oz.

Did you know? Koverts keeps conversion math transparent: you see the factor, the table, and the same rules everywhere on the page.

Educational reference - always verify critical measurements (medical, engineering, legal) with primary sources.

🧪 Volume Converter← Volume

From

Result

128.00007fl oz

1 gal = 128.00007 fl oz

Popular conversions

// gallon_us Conversion table fluid_oz

Gallon US (gal) (gal)	Fluid Ounce (fl oz) (fl oz)
1 gal	128.00007 fl oz
2 gal	256.00014 fl oz
5 gal	640.00034 fl oz
10 gal	1,280.0007 fl oz
20 gal	2,560.0014 fl oz
25 gal	3,200.0017 fl oz
50 gal	6,400.0034 fl oz
100 gal	12,800.007 fl oz
250 gal	32,000.017 fl oz
500 gal	64,000.034 fl oz
1000 gal	128,000.07 fl oz

How to convert

Gallon US (gal) → Fluid Ounce (fl oz)

To convert from Gallon US (gal) (gal) to Fluid Ounce (fl oz) (fl oz)，multiply your value by 128.00007.

fl oz = gal × 128.00007

For example，10 gal = 1,280.0007 fl oz.

// Frequently Asked Questions

How accurate is this converter?▼

Koverts applies standard conversion relationships for Volume. Always double-check results that affect health, safety, contracts, or compliance.

Can I convert other units in this category?▼

Yes. Open the category page or change the “from” and “to” units in the converter to explore every supported pair.

What is 1 gal in fl oz?▼

1 gal = 128.00007 fl oz.

How is the conversion calculated?▼

fl oz = gal × 128.00007.

Can I convert other values?▼

Yes. Use the converter box above to enter any value and get instant results.

// Common related conversions

gal → L

Gallon US (gal) → Liter (L)

L → gal

Liter (L) → Gallon US (gal)

c → mL

Cup (c) → Milliliter (mL)

mL → c

Milliliter (mL) → Cup (c)

L → mL

Liter (L) → Milliliter (mL)

mL → L

Milliliter (mL) → Liter (L)

qt → mL

Quart (qt) → Milliliter (mL)

fl oz → L

Fluid Ounce (fl oz) → Liter (L)

// Related conversions

gal → L

Liter (L)

gal → mL

Milliliter (mL)

gal → qt

Quart (qt)

gal → pt

Pint (pt)