Volume
gal (US)tofl oz (US)
Convert US gallons (gal (US)) to US fluid ounces (fl oz (US)).
Factor1 gal (US) = 128 fl oz (US)
Converter
gal (US)
Accepts numbers or expressions, e.g. 150 + 14.7
Result
fl oz (US)
Rendered to 6 significant figures.
Formula
Formula
fl oz (US) = gal (US) × 128
Multiply any value in US gallons by 128 to obtain the value in US fluid ounces.
Worked example
Convert 1 gal (US) to fl oz (US).
- 01Start with 1 gal (US).
- 02Multiply by the conversion factor: 1 × 128 = 128 fl oz (US).
Result1 gal (US) = 128 fl oz (US)
Conversion table
| gal (US) | fl oz (US) |
|---|---|
| 1 | 128 |
| 2 | 256 |
| 5 | 640 |
| 10 | 1280 |
| 20 | 2560 |
| 50 | 6400 |
| 100 | 12800 |
| 200 | 25600 |
| 500 | 64000 |
| 1000 | 1.2800e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from gal (US) to fl oz (US)?
1 gal (US) equals 128 fl oz (US). To convert, multiply the value in US gallons by 128.
How do I convert 1 gal (US) to fl oz (US)?
1 gal (US) = 128 fl oz (US). For any value, multiply by 128.
How do I convert fl oz (US) back to gal (US)?
Divide by the same factor — or equivalently, multiply by 0.0078125. So 1 fl oz (US) = 0.0078125 gal (US).
When would I need to convert US gallon to US fluid ounce?
Volume conversions are used for tank sizing, batch calculations, and bridging between vendor specs (gallons, barrels, ft³) and process documentation (m³, litres).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).