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US Fluid Ounces to US Gallons (fl oz to gal) Converter

1 US fluid ounce (fl oz) = 0.0078125 US gallons (gal). To convert US fluid ounces to US gallons, multiply by 0.0078125: 12 fl oz × 0.0078125 = 0.09375 gal.

1 fl oz = 0.0078125 gal
Convert the other way: US Gallons to US Fluid Ounces

Quick facts

How to convert US fluid ounces to US gallons

  1. Take the value in US fluid ounces.
  2. Multiply it by 0.0078125 (the number of US gallons in one US fluid ounce).
  3. Round the result to the precision you need.
gal = fl oz × 0.0078125

Worked example (a can of soda): 12 fl oz × 0.0078125 = 0.09375 gal.

To convert US gallons back to US fluid ounces, multiply by 128, or divide by 0.0078125.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

US Fluid Ounces to US Gallons conversion table

US Fluid Ounces to US Gallons conversion table
US Fluid Ounces [fl oz]US Gallons [gal]
0.01 fl oz0.000078125 gal
0.1 fl oz0.00078125 gal
1 fl oz0.0078125 gal
2 fl oz0.015625 gal
3 fl oz0.0234375 gal
5 fl oz0.0390625 gal
10 fl oz0.0781250001 gal
20 fl oz0.1562500002 gal
50 fl oz0.3906250005 gal
100 fl oz0.781250001 gal
1000 fl oz7.8125000099 gal

fl oz to gal chart from 1 to 100

US Gallons to US Fluid Ounces conversion table

US Gallons to US Fluid Ounces conversion table
US Gallons [gal]US Fluid Ounces [fl oz]
0.01 gal1.2799999984 fl oz
0.1 gal12.7999999838 fl oz
1 gal127.9999998377 fl oz
2 gal255.9999996754 fl oz
3 gal383.9999995131 fl oz
5 gal639.9999991885 fl oz
10 gal1279.9999983769 fl oz
20 gal2559.9999967539 fl oz
50 gal6399.9999918846 fl oz
100 gal12799.9999837693 fl oz
1000 gal127999.9998376927 fl oz

US Fluid Ounces vs US Gallons

US Fluid OunceUS Gallon
Symbolfl ozgal
Equals1 fl oz = 0.0078125 gal1 gal = 128 fl oz

What is a US fluid ounce?

A US customary unit equal to 1/16 of a US pint. Used in the US for beverage and bottle sizes.

What is a US gallon?

A US customary unit equal to 4 quarts. Used in the US for fuel, milk, and paint.

Frequently asked questions

How many US gallons are in a US fluid ounce?

There are 0.0078125 US gallons in 1 US fluid ounce (1 fl oz = 0.0078125 gal).

How many US fluid ounces are in a US gallon?

There are 128 US fluid ounces in 1 US gallon (1 gal = 127.9999998377 fl oz).

How do I convert US fluid ounces to US gallons?

Multiply the number of US fluid ounces by 0.0078125. For example, 10 fl oz × 0.0078125 = 0.078125 gal. To convert back, multiply by 128.

What is 10 fl oz in US gallons?

10 fl oz = 0.078125 gal.

What is 100 fl oz in US gallons?

100 fl oz = 0.78125 gal.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026