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US gallon to US fluid ounce
Convert US gallon to US fluid ounce and get the exact value instantly.
About this conversion
To convert US gallon to US fluid ounce, multiply the number of US gallon by 128.
Volume units divide between metric (liters, milliliters) and US customary (gallons, cups, fluid ounces), which trips up cooking, fuel figures and container sizing until you convert them.
Conversion table
| US gallon (gal) | US fluid ounce (fl oz) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1280 fl oz |
| 100 gal | 12800 fl oz |
How to use this converter
- Enter your US gallon value
Type any number into the US gallon field. It starts at 1 so you can read the rate straight away.
- Read the US fluid ounce result
The amount in US fluid ounce updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many US fluid ounce are in one US gallon?
- One US gallon equals 128 fl oz. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The US gallon to US fluid ounce conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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