Convert US gallons to US fluid ounces
1 US gallon = 128 US fluid ounces · fl oz = gal × 128
When you need this conversion
This conversion goes from US gallons, the fuel and liquid volume unit in the US, to US fluid ounces, used for drinks and recipe liquids. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
US gallons to US fluid ounces conversion table
| US gallons (gal) | US fluid ounces (fl oz) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1,280 fl oz |
| 15 gal | 1,920 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 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 |
The formula
fl oz = gal × 128Because both units measure volume, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
US fluid ounces to US gallons →Related volume conversions
- Milliliters to US fluid ounces
- US gallons to liters
- Milliliters to US cups
- Liters to cubic meters
- Liters to US gallons
- Cubic meters to liters
- Cubic meters to cubic feet
- Cubic feet to cubic meters
- US cups to milliliters
- US fluid ounces to milliliters
- Liters to US fluid ounces
- Cubic meters to US fluid ounces
Frequently asked questions
- How many US fluid ounces are in a US gallon?
- There are 128 US fluid ounces in 1 US gallon. The formula is fl oz = gal × 128.
- How do you convert US gallons to US fluid ounces?
- Use the formula fl oz = gal × 128. For example, 10 US gallons equals 1,280 US fluid ounces.
- Is the US gallons to US fluid ounces conversion exact?
- Yes. US gallons and US fluid ounces are both units of volume, related by an exact defined factor. Displayed results are rounded for readability.
- What is gal short for?
- gal is the standard symbol for US gallon (also written as gallons). fl oz is the symbol for US fluid ounce.