Convert US gallon to US fluid ounce
1 gal = 128 fl oz
1 gal = 128 fl oz
1 gal in every volume unit
| milliliter | 3,790 mL |
| centiliter | 379 cL |
| liter | 3.79 L |
| cubic meter | 0.00379 m³ |
| cubic inch | 231 in³ |
| cubic foot | 0.134 ft³ |
| US fluid ounce | 128 fl oz |
| US pint | 8 pt |
| US quart | 4 qt |
| US gallon | 1 gal |
| imperial gallon | 0.833 imp gal |
| cubic yard | 0.00495 yd³ |
| acre-foot | 0.00000307 ac·ft |
How the conversion works
Multiply by 128 to go from US gallon to US fluid ounce, or divide by it to go back. Every conversion on this site routes through the SI value (m³) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? US fluid ounce to US gallon — 1 fl oz = 0.0078125 gal.
US gallon to US fluid ounce — common values
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1,280 fl oz |
| 15 gal | 1,920 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 fl oz |
| 50 gal | 6,400 fl oz |
| 75 gal | 9,600 fl oz |
| 100 gal | 12,800 fl oz |
| 250 gal | 32,000 fl oz |
| 500 gal | 64,000 fl oz |
| 1000 gal | 128,000 fl oz |
Solvers that use volume