Gallons (US) to Fluid Ounces (US)
Convert Gallons (US) (gal) to Fluid Ounces (US) (fl oz) instantly, with a formula, reference table, and FAQ.
Formula
Gallons (US) × 128 = Fluid Ounces (US)
Gallons (US) (gal) and Fluid Ounces (US) (fl oz) are both units of volume. Use the converter above for any value, or check the quick-reference table below for common amounts.
Quick reference
| gal | fl oz |
|---|---|
| 1 gal | 128 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 |
| 500 gal | 64,000 fl oz |
| 1000 gal | 128,000 fl oz |
Frequently asked questions
How many Fluid Ounces (US) is one Gallons (US)?
One Gallons (US) (gal) equals 128 Fluid Ounces (US) (fl oz).
How do I convert Gallons (US) to Fluid Ounces (US)?
Multiply the value in Gallons (US) by 128 to get Fluid Ounces (US).
Is the Gallons (US) to Fluid Ounces (US) conversion exact?
Yes — this converter uses the internationally defined conversion factor between gallons (us) and fluid ounces (us), accurate to several decimal places.