US gallons to US fluid ounces converter
US fluid ounces (US fl oz)
1 US gallon = 128 US fluid ounces
How to convert US gallons to US fluid ounces
US fl oz = US gal × 128
Multiply the number of US gallons by 128 to get US fluid ounces. Going the other way, divide by 128 (or multiply by 0.0078125).
One US gallon is exactly defined as 128 US fluid ounces (to 12 significant figures), and one US fluid ounce is 0.0078125 US gallons.
Worked examples
- Convert 5 US gallons: 5 × 128 = 640 640 US fluid ounces.
- Convert 12.5 US gallons: 12.5 × 128 = 1,600 1,600 US fluid ounces.
- Convert 250 US gallons: 250 × 128 = 32,000 32,000 US fluid ounces.
Quick-reference table
| US gal | US fl oz |
|---|---|
| 1 | 128 |
| 2 | 256 |
| 3 | 384 |
| 5 | 640 |
| 10 | 1,280 |
| 15 | 1,920 |
| 20 | 2,560 |
| 25 | 3,200 |
| 50 | 6,400 |
| 75 | 9,600 |
| 100 | 12,800 |
| 1,000 | 128,000 |
| US fl oz | US gal |
|---|---|
| 1 | 0.0078125 |
| 2 | 0.015625 |
| 3 | 0.0234375 |
| 5 | 0.0390625 |
| 10 | 0.078125 |
| 15 | 0.1171875 |
| 20 | 0.15625 |
| 25 | 0.1953125 |
| 50 | 0.390625 |
| 75 | 0.5859375 |
| 100 | 0.78125 |
| 1,000 | 7.8125 |
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Frequently asked questions
How many US fluid ounces are in 1 US gallon?
1 US gallon equals 128 US fluid ounces.
What is the formula to convert US gallons to US fluid ounces?
Use US fl oz = US gal × 128. Multiply the number of US gallons by 128 to get US fluid ounces. Going the other way, divide by 128 (or multiply by 0.0078125).
What is 100 US gallons in US fluid ounces?
100 US gallons is 12,800 US fluid ounces.