Volume conversion
1 us gallon (US gal) equals 128 us fluid ounce (US fl oz). Enter any value below to convert from US gal to US fl oz.
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1 US gal = 128 US fl oz
| Unit | Value |
|---|---|
| Cubic meter m³ | 0.0037854118 |
| Liter L | 3.785411784 |
| Milliliter mL | 3,785.411784 |
| Cubic centimeter cm³ | 3,785.411784 |
| Cubic inch in³ | 231 |
| Cubic foot ft³ | 0.1336805556 |
| US gallon US gal | 1 |
| Imperial gallon imp gal | 0.8326741846 |
| US quart US qt | 4 |
| US customary cup US cup | 16 |
| US fluid ounce US fl oz | 128 |
Formula
Use this relationship for a direct conversion:
2 US gal = 256 US fl oz.
US liquid and Imperial gallon definitions are treated separately and use their exact legal values.
Quick reference
| US gallon (US gal) | US fluid ounce (US fl oz) |
|---|---|
| 0.01 | 1.28 |
| 0.1 | 12.8 |
| 1 | 128 |
| 2 | 256 |
| 5 | 640 |
| 10 | 1,280 |
| 25 | 3,200 |
| 50 | 6,400 |
| 100 | 12,800 |
| 1,000 | 128,000 |
From unit
Exactly 231 cubic inches.
Symbol: US gal
To unit
One 128th of a US liquid gallon.
Symbol: US fl oz
Keep converting
Source
Definitions are checked against NIST Handbook 44, Appendix C. Calculations use full internal precision before display rounding.
View the complete volume converterQuestions
Use the formula US fl oz = US gal x 128. 1 us gallon (US gal) equals 128 us fluid ounce (US fl oz).
Both unit definitions use exact factors. Only the displayed decimal may be rounded.
