How to convert gallons to fluid ounces
Formula: fl oz = gal × 128
Worked example: 5 gal → 5 × 128 = 640 fl oz
Gallons to fluid ounces conversion chart
| Gallons (gal) | Fluid ounces (fl oz) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 4 gal | 512 fl oz |
| 5 gal | 640 fl oz |
| 6 gal | 768 fl oz |
| 7 gal | 896 fl oz |
| 8 gal | 1,024 fl oz |
| 9 gal | 1,152 fl oz |
| 10 gal | 1,280 fl oz |
| 12 gal | 1,536 fl oz |
| 15 gal | 1,920 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 fl oz |
| 30 gal | 3,840 fl oz |
| 40 gal | 5,120 fl oz |
| 50 gal | 6,400 fl oz |
| 75 gal | 9,600 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 is a gallon?
The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters, and holds 4 quarts or 128 fluid ounces. Gasoline, milk, paint and water use in the United States are measured in gallons.
What is a fluid ounce?
The US fluid ounce is 1/128 of a US gallon, about 29.57 ml. It measures drinks and liquid ingredients: a soda can holds 12 fl oz. It is a volume, unlike the ounce on a scale, and slightly larger than the imperial fluid ounce.