Gallons to Fluid Ounces Converter
Convert gallons to fluid ounces using the formula gal × 128 = fl oz. The calculator below shows higher precision results. The reference table is rounded for readability.
This converter uses US customary gallons and fluid ounces. UK (imperial) gallons and fluid ounces are a different size.
Formula and Step-by-Step
Step-by-step: 1 gal to fl oz
- Start with 1 gal
- Multiply by 128: 1 × 128 = 128
- Result: 1 gal = 128 fl oz
Conversion Table
Common gallons to fluid ounces values. The table and calculator both use the same conversion formula shown above.
| Gallons (gal) | Fluid Ounces (fl oz) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1,280 fl oz |
| 25 gal | 3,200 fl oz |
| 50 gal | 6,400 fl oz |
| 100 gal | 12,800 fl oz |
| 250 gal | 32,000 fl oz |
| 500 gal | 64,000 fl oz |
| 1,000 gal | 128,000 fl oz |
What Are Gallons and Fluid Ounces?
What is a Gallon?
A US gallon is a unit of volume equal to approximately 3.785 liters. Note: a UK (imperial) gallon is larger at 4.546 liters. This converter uses US gallons.
What is a Fluid Ounce?
A US fluid ounce is a unit of volume equal to approximately 29.57 milliliters. A UK (imperial) fluid ounce is slightly smaller at 28.41 milliliters. This converter uses US fluid ounces.
Why convert gallons to fluid ounces?
People convert gallons to fluid ounces when working across different measurement systems.