US gallons (gal) to Fluid ounces (fl oz) Conversion
US gallons
The US liquid gallon is a unit of volume equal to exactly 3.785411784 litres, used primarily in the United States for fuel sales, beverage containers, and agricultural applications. It is divided into 4 quarts, 8 pints, or 128 fluid ounces. The US gallon is approximately 16.7% smaller than the imperial (UK) gallon — a difference with significant implications in fuel economy comparisons and recipe conversions.
Fluid ounces
The fluid ounce is a unit of volume used for measuring liquids in the US customary and imperial systems. The US fluid ounce is approximately 29.5735 mL while the imperial fluid ounce is 28.4131 mL. It should not be confused with the avoirdupois ounce (a unit of mass). In the United States, oral liquid medications and beverage serving sizes on nutrition labels are expressed in fluid ounces.
| US gallons (gal) | Fluid ounces (fl oz) |
|---|---|
| 0.1 gal | 12.799999983769 fl oz |
| 1 gal | 127.99999983769 fl oz |
| 2 gal | 255.99999967539 fl oz |
| 3 gal | 383.99999951308 fl oz |
| 5 gal | 639.99999918846 fl oz |
| 10 gal | 1279.9999983769 fl oz |
| 20 gal | 2559.9999967539 fl oz |
| 30 gal | 3839.9999951308 fl oz |
| 50 gal | 6399.9999918846 fl oz |
| 100 gal | 12799.999983769 fl oz |
| 1000 gal | 127999.99983769 fl oz |
Frequently Asked Questions (FAQ)
How many fluid ounces are in 1 US gallons?
1 US gallons (gal) is exactly 128.000 fluid ounces (fl oz).
How do I convert US gallons to fluid ounces?
Multiply the value in US gallons by 128.000 to get the result in fluid ounces. Or use the converter above — type any number and see the result instantly.