Gallon (US) to Fluid Ounce (US) Converter
Volume · unit-converter
Convert Gallon (US) to Fluid Ounce (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: Gallon (US) (gal)
To: Fluid Ounce (US) (floz)
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.
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.
How to convert gallons (us) to fluid ounces (us)
1 gallon (us) is equal to 127.99999986474391 fluid ounce (us):
1 gal = (3.78541178 L ÷ 0.0295735295625 L) floz = 127.99999986474391 floz
Each gallon (us) is defined as 3.78541178 L and each fluid ounce (us) as 0.0295735295625 L, so one gal equals 3.78541178 ÷ 0.0295735295625 floz = 127.99999986474391 floz.
Let V(gal) be the numeric value of the same volume measured in Gallon (US) (gal), and V(floz) the value in Fluid Ounce (US) (floz). Then:
V(floz) = V(gal) × (3.78541178 / 0.0295735295625)
Equivalently, divide by how many gal fit into one floz (liters per floz divided by liters per gal):
V(floz) = V(gal) ÷ 0.00781250000826
Or: fluid ounce (us) = gallon (us) ÷ 0.00781250000826
Examples
Example #1: Convert 20 gal to fluid ounce (us)
20 gal = 20 gal × (3.78541178/0.0295735295625) floz = 2559.99999729 floz
20 gal = 20 gal ÷ 0.00781250000826 = 2559.99999729 floz
Example #2: Convert 50 gal to fluid ounce (us)
50 gal = 50 gal × (3.78541178/0.0295735295625) floz = 6399.99999324 floz
50 gal = 50 gal ÷ 0.00781250000826 = 6399.99999324 floz
Summary
To convert Gallon (US) to Fluid Ounce (US), multiply the value in gal by the ratio of liters per gal divided by liters per floz. Equivalently: value_floz = value_gal × (3.78541178 / 0.0295735295625). Numerically, 1 gal equals 127.99999986474391 floz.
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 Gallon (US) to Fluid Ounce (US) is 1.280000e+2 (1 gal = 127.99999986474391 floz).
Conversion tables
| Gallon (US) (gal) | Fluid Ounce (US) (floz) |
|---|---|
| 0.1 | 12.7999999865 |
| 1 | 127.999999865 |
| 2 | 255.999999729 |
| 3 | 383.999999594 |
| 4 | 511.999999459 |
| 5 | 639.999999324 |
| 6 | 767.999999188 |
| 7 | 895.999999053 |
| 8 | 1,023.99999892 |
| 9 | 1,151.99999878 |
| Gallon (US) (gal) | Fluid Ounce (US) (floz) |
|---|---|
| 10 | 1,279.99999865 |
| 20 | 2,559.99999729 |
| 30 | 3,839.99999594 |
| 40 | 5,119.99999459 |
| 50 | 6,399.99999324 |
| 60 | 7,679.99999188 |
| 70 | 8,959.99999053 |
| 80 | 10,239.9999892 |
| 90 | 11,519.9999878 |
| 100 | 12,799.9999865 |
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-gallon to uk-gallonGallon (US) to Gallon (UK)
- us-gallon to uk-quartGallon (US) to Quart (UK)
- us-gallon to uk-pintGallon (US) to Pint (UK)
- us-gallon to us-quartGallon (US) to Quart (US)
- us-gallon to us-pintGallon (US) to Pint (US)
- us-gallon to uk-cupGallon (US) to Cup (UK)
- us-gallon to us-cupGallon (US) to Cup (US)
- us-gallon to uk-fluid-ounceGallon (US) to Fluid Ounce (UK)
- us-gallon to uk-tablespoonGallon (US) to Tablespoon (UK)
- us-gallon to uk-teaspoonGallon (US) to Teaspoon (UK)
- uk-gallon to us-fluid-ounceGallon (UK) to Fluid Ounce (US)
- uk-quart to us-fluid-ounceQuart (UK) to Fluid Ounce (US)