Convert US gallon to US fluid ounce

1 gal = 128 fl oz

1 gal = 128 fl oz
1 gal in every volume unit
cubic millimeter3,785,400 mm³
microliter3,785,400 μL
milliliter3,785.4 mL
cubic centimeter3,785.4 cm³
US teaspoon768 tsp
centiliter378.54 cL
US tablespoon256 tbsp
cubic inch231 in³
imperial fluid ounce133.23 imp fl oz
US fluid ounce128 fl oz
deciliter37.854 dL
US cup16 cup
US pint8 pt
imperial pint6.6614 imp pt
US quart4 qt
liter3.7854 L
cubic decimeter3.7854 dm³
imperial quart3.3307 imp qt
board foot1.6042 fbm
US gallon1 gal
imperial gallon0.83267 imp gal
cubic foot0.13368 ft³
US bushel0.10742 bu
hectoliter0.037854 hL
US beer barrel0.032258 bbl beer
oil barrel0.02381 bbl
cubic yard0.0049511 yd³
cubic meter0.0037854 m³
kiloliter0.0037854 kL
hundred cubic feet0.0013368 CCF
cord0.0010444 cord
acre-foot0.0000030689 ac·ft
million US gallons0.000001 MG
cubic kilometer3.7854e-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 gal128 fl oz
2 gal256 fl oz
3 gal384 fl oz
5 gal640 fl oz
10 gal1,280 fl oz
15 gal1,920 fl oz
20 gal2,560 fl oz
25 gal3,200 fl oz
50 gal6,400 fl oz
75 gal9,600 fl oz
100 gal12,800 fl oz
250 gal32,000 fl oz
500 gal64,000 fl oz
1000 gal128,000 fl oz