Gallons (US Liquid) to Fluid ounces (US) converter

US Gallons and US Fluid Ounces: Definitions

US Gallon is a unit of liquid volume in the United States customary system.

• 1 US gallon = 3.785411784 L
• Relations: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 US fl oz
• Usage: measuring larger volumes of liquids such as milk, juice, or fuel

US Fluid Ounce is a smaller unit of liquid volume in the US customary system.

• 1 US fl oz = 29.5735 ml
• Usage: measuring small liquid volumes in cooking, beverages, or lab work

Conversion Between US Gallons and US Fluid Ounces

How to Convert:

• US Gallons → US Fluid Ounces: fluid ounces = gallons × 128
• US Fluid Ounces → US Gallons: gallons = fluid ounces ÷ 128

Examples:

• 2 gallons → 2 × 128 = 256 fl oz
• 5 gallons → 5 × 128 = 640 fl oz
• 128 fl oz → 128 ÷ 128 = 1 gallon
• 64 fl oz → 64 ÷ 128 = 0.5 gallon

Additional Notes

• US fluid ounces differ from UK (imperial) fluid ounces (1 UK fl oz ≈ 28.41 ml)
• Understanding these conversions helps measure liquids accurately for recipes, beverages, or fuel