US gallon to US fluid ounce Converter
1 gal = 128 fl oz — convert instantly with formula and table.
Use the converter above for an immediate result — it recalculates on every keystroke and works offline once the page has loaded.
Quick answer: one us gallon equals 128 US fluid ounces. So to convert US gallons to US fluid ounces, multiply by 128.
How to convert US gallons to US fluid ounces
US fluid ounces = US gallons × 128
The US gallon is exactly 3.785411784 liters. American fuel prices are quoted per gallon, making this one of the most practical conversions for travelers.
The US fluid ounce is about 29.57 ml — slightly larger than the UK fluid ounce. Eight fluid ounces make a US cup.
US gallon to US fluid ounce conversion table
| US gallon (gal) | US fluid ounce (fl oz) |
|---|---|
| 0.01 gal | 1.28 fl oz |
| 0.1 gal | 12.8 fl oz |
| 0.25 gal | 32 fl oz |
| 0.4 gal | 51.2 fl oz |
| 0.75 gal | 96 fl oz |
| 1.25 gal | 160 fl oz |
| 1.75 gal | 224 fl oz |
| 2.5 gal | 320 fl oz |
| 3.5 gal | 448 fl oz |
| 4.5 gal | 576 fl oz |
| 6 gal | 768 fl oz |
| 8 gal | 1,024 fl oz |
| 10 gal | 1,280 fl oz |
| 12 gal | 1,536 fl oz |
| 14 gal | 1,792 fl oz |
| 16 gal | 2,048 fl oz |
| 18 gal | 2,304 fl oz |
| 20 gal | 2,560 fl oz |
| 24 gal | 3,072 fl oz |
| 26 gal | 3,328 fl oz |
| 30 gal | 3,840 fl oz |
| 35 gal | 4,480 fl oz |
| 45 gal | 5,760 fl oz |
| 55 gal | 7,040 fl oz |
| 65 gal | 8,320 fl oz |
| 75 gal | 9,600 fl oz |
| 85 gal | 10,880 fl oz |
| 95 gal | 12,160 fl oz |
| 110 gal | 14,080 fl oz |
| 125 gal | 16,000 fl oz |
| 175 gal | 22,400 fl oz |
| 250 gal | 32,000 fl oz |
| 350 gal | 44,800 fl oz |
| 450 gal | 57,600 fl oz |
| 600 gal | 76,800 fl oz |
| 750 gal | 96,000 fl oz |
| 900 gal | 115,200 fl oz |
| 1,500 gal | 192,000 fl oz |
| 2,500 gal | 320,000 fl oz |
| 10,000 gal | 1,280,000 fl oz |
Need the opposite direction? Use the US fluid ounce to US gallon converter, or read our complete guide to volume conversions for every formula in one place.
Frequently asked questions
How many US fluid ounces are in one us gallon?
One us gallon equals 128 US fluid ounces. Multiply any us gallon value by 128 to get US fluid ounces.
What is 10 US gallons in US fluid ounces?
10 US gallons equal 1,280 US fluid ounces (10 × 128).
Is the us gallon to us fluid ounce conversion exact?
The conversion factor used here (128) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.
Is my data stored when I use this converter?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.