US gallons to US fluid ounces
1 US gallon = 128 US fluid ounces. Type any value below for an instant conversion.
Enter a value to convert.
How to convert US gallons to US fluid ounces
Multiply the US gallon value by 128:
US fluid ounces = US gallons × 128
Example: 10 gal × 128 = 1,280 fl oz. Going the other way, divide by 128 (or multiply by 0.007813) — or use our US fluid ounces to US gallons converter.
Conversion table
| US gallons | US fluid ounces |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 5 gal | 640 fl oz |
| 8 gal | 1,024 fl oz |
| 10 gal | 1,280 fl oz |
| 12 gal | 1,536 fl oz |
| 16 gal | 2,048 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 fl oz |
| 50 gal | 6,400 fl oz |
| 100 gal | 12,800 fl oz |
| 250 gal | 32,000 fl oz |
| 500 gal | 64,000 fl oz |
| 750 gal | 96,000 fl oz |
| 1,000 gal | 128,000 fl oz |
About these units
US gallon (gal) and US fluid ounce (fl oz) are both units of volume. Liters and milliliters are the international standard; gallons, cups, and fluid ounces here are US customary measures (UK imperial versions differ slightly).
Need a different pair? Try the full unit converter.
Related: Liters to US gallons · US gallons to liters · Milliliters to US fluid ounces · US fluid ounces to milliliters · US cups to milliliters · Milliliters to US cups