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Fluid Ounces to Gallons

Convert fluid ounces (fl oz) to gallons (gal) — instant and accurate

1 fl oz = 0.0078125 gal  ·  To convert fluid ounces to gallons, multiply by 0.0078125.

0.0078125 gal

Fluid Ounces to Gallons Conversion Table

Fluid OuncesGallons
0.25 fl oz0.00195312 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
6 fl oz0.046875 gal
8 fl oz0.0625 gal
10 fl oz0.078125 gal
16 fl oz0.125 gal
25 fl oz0.195312 gal
50 fl oz0.390625 gal
100 fl oz0.78125 gal
250 fl oz1.95312 gal
500 fl oz3.90625 gal
1000 fl oz7.8125 gal

Formula

gallons = fluid ounces × 0.0078125
fluid ounces = gallons × 128
Example: 5 fl oz × 0.0078125 = 0.0390625 gal

About the Fluid Ounces-to-Gallons Conversion

Converting fluid ounces to gallons comes up most often when interpreting measurements or specifications across different contexts. Fluid Ounces is widely used for beverages, recipes, and personal-care products in the United States; gallons is the standard for fuel, milk, paint, and large liquid quantities in the United States. Both units belong to the US customary system. One fl oz equals 0.0078125 gal.

Real-World Examples

  • 0.25 fl oz (0.25 fluid ounces) = 0.00195312 gal
  • 8 fl oz (8 fluid ounces) = 0.0625 gal
  • 1000 fl oz (1000 fluid ounces) = 7.8125 gal

Gallons to Fluid Ounces (Reverse)

GallonsFluid Ounces
0.25 gal32 fl oz
0.5 gal64 fl oz
1 gal128 fl oz
2 gal256 fl oz
3 gal384 fl oz
4 gal512 fl oz
5 gal640 fl oz
6 gal768 fl oz
8 gal1024 fl oz
10 gal1280 fl oz
16 gal2048 fl oz
25 gal3200 fl oz
50 gal6400 fl oz
100 gal12800 fl oz
250 gal32000 fl oz
500 gal64000 fl oz
1000 gal128000 fl oz

Frequently Asked Questions

How many gallons are in a fluid ounce?

1 fluid ounce equals 0.0078125 gallons.

How do I convert fluid ounces to gallons?

Multiply the value in fluid ounces by 0.0078125 to get gallons. For example, 5 fl oz × 0.0078125 = 0.0390625 gal.

How do I convert gallons back to fluid ounces?

Multiply the value in gallons by 128 to get fluid ounces. Equivalently, divide by 0.0078125.

How many fluid ounces are in a gallon?

1 gallon equals 128 fluid ounces.

Is the fluid ounces-to-gallons conversion exact?

Yes. 1 fl oz = 0.0078125 gal is an exact value defined by international agreement.

About Fluid Ounces and Gallons

The US fluid ounce (symbol fl oz) equals 2 tablespoons, or exactly 29.5735 milliliters. It is distinct from the UK fluid ounce, which is slightly larger.

The US liquid gallon (symbol gal) equals 4 quarts, 8 pints, or exactly 3.78541 liters. The UK imperial gallon is about 20% larger (4.546 L).

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