Convert US gallon to US fluid ounce
1 gal = 128 fl oz
1 gal = 128 fl oz
1 gal in every volume unit
| cubic millimeter | 3,785,400 mm³ |
| microliter | 3,785,400 μL |
| milliliter | 3,785.4 mL |
| cubic centimeter | 3,785.4 cm³ |
| US teaspoon | 768 tsp |
| centiliter | 378.54 cL |
| US tablespoon | 256 tbsp |
| cubic inch | 231 in³ |
| imperial fluid ounce | 133.23 imp fl oz |
| US fluid ounce | 128 fl oz |
| deciliter | 37.854 dL |
| US cup | 16 cup |
| US pint | 8 pt |
| imperial pint | 6.6614 imp pt |
| US quart | 4 qt |
| liter | 3.7854 L |
| cubic decimeter | 3.7854 dm³ |
| imperial quart | 3.3307 imp qt |
| board foot | 1.6042 fbm |
| US gallon | 1 gal |
| imperial gallon | 0.83267 imp gal |
| cubic foot | 0.13368 ft³ |
| US bushel | 0.10742 bu |
| hectoliter | 0.037854 hL |
| US beer barrel | 0.032258 bbl beer |
| oil barrel | 0.02381 bbl |
| cubic yard | 0.0049511 yd³ |
| cubic meter | 0.0037854 m³ |
| kiloliter | 0.0037854 kL |
| hundred cubic feet | 0.0013368 CCF |
| cord | 0.0010444 cord |
| acre-foot | 0.0000030689 ac·ft |
| million US gallons | 0.000001 MG |
| cubic kilometer | 3.7854e-12 km³ |
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 |