🧪 Volume converter

Fluid Ounce to Gallon Converter

Convert fluid ounces (fl oz) to gallons (gal) instantly with the exact formula, a conversion table and chart.

fl oz

Results

Gallons
0.0078125 gal
Same value in every unit

📊 Fluid Ounce to Gallon chart

Fluid Ounce to Gallon — plotted against fluid ounce (fl oz).

How to convert fluid ounces to gallons

To convert fluid ounces to gallons, multiply by 0.0078125. Volume conversions help with recipes, fuel, beverages, aquariums and laboratory work. US customary units are used here.

gal = fl oz × 0.0078125 fl oz = gal ÷ 0.0078125
Fluid Ounce to Gallon conversion – fl oz to gal formula illustration
Fluid Ounce (fl oz) → Gallon (gal) at a glance.

Fluid Ounce to Gallon conversion table

Fluid Ounce (fl oz)Gallon (gal)
0.1 fl oz0.00078125 gal
0.5 fl oz0.00390625 gal
1 fl oz0.0078125 gal
2 fl oz0.015625 gal
3 fl oz0.0234375 gal
4 fl oz0.03125 gal
5 fl oz0.0390625 gal
10 fl oz0.078125 gal
20 fl oz0.15625 gal
25 fl oz0.1953125 gal
50 fl oz0.390625 gal
100 fl oz0.78125 gal
500 fl oz3.90625 gal
1,000 fl oz7.8125 gal

About the units

Fluid Ounce (fl oz)

A US fluid ounce is 1/128 of a US gallon, exactly 29.5735295625 mL.

Gallon (gal)

A US liquid gallon is defined as 231 cubic inches, exactly 3.785411784 liters.

How to use this converter

  1. Type the number of fluid ounces (fl oz) in the input box.
  2. The result in gallons appears instantly — no button needed.
  3. See the same value in every other volume unit just below.
  4. Use “Swap units” to convert gallons back to fluid ounces.

Tips for better results

  • Double-check which system a unit belongs to (for example US vs UK gallons).
  • Use the swap button to convert in the opposite direction instantly.
  • Bookmark the conversions you use most — each pair has its own page.

Frequently asked questions

How many gallons are in one fluid ounce?

One fluid ounce equals 0.0078125 gallons. 0.0078125 is the exact factor used by this converter.

How do I convert fluid ounces to gallons?

Multiply the value in fluid ounces by 0.0078125. To go the other way, multiply gallons by 128.

What is 10 fl oz in gal?

10 fl oz = 0.078125 gal. Also, 5 fl oz = 0.0390625 gal and 100 fl oz = 0.78125 gal.

What is the difference between a fluid ounce and a gallon?

A US fluid ounce is 1/128 of a US gallon, exactly 29.5735295625 mL. A US liquid gallon is defined as 231 cubic inches, exactly 3.785411784 liters.

Is this tool free and private?

Yes — the Fluid Ounce to Gallon is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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