Fluid Ounce (US) to Gallon (US) Converter
Volume · unit-converter
Convert Fluid Ounce (US) to Gallon (US) with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use liter-based factors (US fluid measures, imperial UK units, SI cubic meters).
Calculator
From: Fluid Ounce (US) (floz)
To: Gallon (US) (gal)
About Fluid Ounce (US)
The US fluid ounce is 1/128 of a US gallon (about 29.5735 ml). US nutrition labels and recipes use fluid ounces for liquids.
About Gallon (US)
The US liquid gallon is defined as 231 cubic inches (about 3.78541 liters). US recipes, fuel economy, and retail liquids typically use US gallons.
How to convert fluid ounces (us) to gallons (us)
1 fluid ounce (us) is equal to 0.00781250000826 gallon (us):
1 floz = (0.0295735295625 L ÷ 3.78541178 L) gal = 0.00781250000826 gal
Each fluid ounce (us) is defined as 0.0295735295625 L and each gallon (us) as 3.78541178 L, so one floz equals 0.0295735295625 ÷ 3.78541178 gal = 0.00781250000826 gal.
Let V(floz) be the numeric value of the same volume measured in Fluid Ounce (US) (floz), and V(gal) the value in Gallon (US) (gal). Then:
V(gal) = V(floz) × (0.0295735295625 / 3.78541178)
Equivalently, divide by how many floz fit into one gal (liters per gal divided by liters per floz):
V(gal) = V(floz) ÷ 127.99999986474391
Or: gallon (us) = fluid ounce (us) ÷ 127.99999986474391
Examples
Example #1: Convert 20 floz to gallon (us)
20 floz = 20 floz × (0.0295735295625/3.78541178) gal = 0.1562500002 gal
20 floz = 20 floz ÷ 127.99999986474391 = 0.1562500002 gal
Example #2: Convert 50 floz to gallon (us)
50 floz = 50 floz × (0.0295735295625/3.78541178) gal = 0.3906250004 gal
50 floz = 50 floz ÷ 127.99999986474391 = 0.3906250004 gal
Summary
To convert Fluid Ounce (US) to Gallon (US), multiply the value in floz by the ratio of liters per floz divided by liters per gal. Equivalently: value_gal = value_floz × (0.0295735295625 / 3.78541178). Numerically, 1 floz equals 0.007812500008255376 gal.
Relationship context
Both units are US customary fluid / volume in this tool’s grouping. Conversions use fixed liter equivalents, so factors are consistent for cooking, engineering, and cross-checking labels. The factor from Fluid Ounce (US) to Gallon (US) is 7.812500e-3 (1 floz = 0.007812500008255376 gal).
Conversion tables
| Fluid Ounce (US) (floz) | Gallon (US) (gal) |
|---|---|
| 0.1 | 0.00078125 |
| 1 | 0.0078125 |
| 2 | 0.015625 |
| 3 | 0.0234375 |
| 4 | 0.03125 |
| 5 | 0.0390625 |
| 6 | 0.046875 |
| 7 | 0.0546875001 |
| 8 | 0.0625000001 |
| 9 | 0.0703125001 |
| Fluid Ounce (US) (floz) | Gallon (US) (gal) |
|---|---|
| 10 | 0.0781250001 |
| 20 | 0.1562500002 |
| 30 | 0.2343750002 |
| 40 | 0.3125000003 |
| 50 | 0.3906250004 |
| 60 | 0.4687500005 |
| 70 | 0.5468750006 |
| 80 | 0.6250000007 |
| 90 | 0.7031250007 |
| 100 | 0.7812500008 |
Conversions outside the hub list
The grid on the category page lists hub units only. These pairs include at least one unit outside that hub set (same tools: formulas and tables on each page).
- us-fluid-ounce to uk-gallonFluid Ounce (US) to Gallon (UK)
- us-fluid-ounce to uk-quartFluid Ounce (US) to Quart (UK)
- us-fluid-ounce to uk-pintFluid Ounce (US) to Pint (UK)
- us-fluid-ounce to us-quartFluid Ounce (US) to Quart (US)
- us-fluid-ounce to us-pintFluid Ounce (US) to Pint (US)
- us-fluid-ounce to uk-cupFluid Ounce (US) to Cup (UK)
- us-fluid-ounce to us-cupFluid Ounce (US) to Cup (US)
- us-fluid-ounce to uk-fluid-ounceFluid Ounce (US) to Fluid Ounce (UK)
- us-fluid-ounce to uk-tablespoonFluid Ounce (US) to Tablespoon (UK)
- us-fluid-ounce to uk-teaspoonFluid Ounce (US) to Teaspoon (UK)
- uk-gallon to us-gallonGallon (UK) to Gallon (US)
- uk-quart to us-gallonQuart (UK) to Gallon (US)