Convert gallons to fluid ounces quickly and accurately using this free online converter
Used in cooking, beverages, and liquid measurements.
💡 The US uses cups, fluid ounces, and gallons; metric countries use liters and milliliters.
fl oz = gal × 128.0001
Example: 1 gal × 128.0001 = 128.0001 fl oz
Use liters for international recipes; cups/gallons for US recipes.
Common uses: cooking, beverages, and liquid containers.
How do I convert gal to fl oz?
Multiply the value in Gallons by 128.0001. For example: 10 gal = 1280.0007 fl oz.
When should I use Fluid Ounces instead of Gallons?
Use liters for international recipes; cups/gallons for US recipes.
Is this converter accurate?
Yes. We use internationally recognized conversion factors, updated to current standards.
| Gallons (gal) | Fluid Ounces (fl oz) |
|---|---|
| 1 gal | 128.0001 fl oz |
| 2 gal | 256.0001 fl oz |
| 5 gal | 640.0003 fl oz |
| 10 gal | 1280.0007 fl oz |
| 20 gal | 2560.0014 fl oz |
| 50 gal | 6400.0034 fl oz |
| 100 gal | 12,800.01 fl oz |
| 500 gal | 64,000.03 fl oz |
| 1000 gal | 128,000.07 fl oz |