Volume Converter
Liters, gallons, cups and more.
Conversion
US Gallons to US Fluid Ounces Converter
1 US gallon = 128 fl oz. Enter any value to convert US gallons (gal) to US fluid ounces (fl oz), or use the table below for common values.
Formula
fl oz = gal × 128
Example: 10 gal = 1,280 fl oz. To convert the other way, use gal = fl oz × 0.0078125.
Quick mental estimate: multiply by about 130.
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 |
| 4 gal | 512 fl oz |
| 5 gal | 640 fl oz |
| 6 gal | 768 fl oz |
| 7 gal | 896 fl oz |
| 8 gal | 1,024 fl oz |
| 9 gal | 1,152 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 |
| 30 gal | 3,840 fl oz |
| 40 gal | 5,120 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 |
About US gallons and US fluid ounces
The US gallon is exactly 231 cubic inches, about 3.785 liters. Fuel and milk are sold by the gallon in the US; the UK imperial gallon is about 4.546 liters.
The US fluid ounce is 1/128 of a US gallon, about 29.57 mL. It is used on drink and cosmetics labels in the US.
Other Volume conversions
US Fluid Ounces → US GallonsReverse conversionMilliliters → US Fluid OuncesmL → fl ozLiters → US Fluid OuncesL → fl ozCubic Meters → US Fluid Ouncesm³ → fl ozUS Teaspoons → US Fluid Ouncestsp → fl ozUS Tablespoons → US Fluid Ouncestbsp → fl ozUS Cups → US Fluid Ouncescup → fl ozUS Pints → US Fluid Ouncespt → fl ozUS Quarts → US Fluid Ouncesqt → fl ozUS Gallons → Millilitersgal → mLUS Gallons → Litersgal → LUS Gallons → Cubic Metersgal → m³US Gallons → US Teaspoonsgal → tspUS Gallons → US Tablespoonsgal → tbspUS Gallons → US Cupsgal → cupUS Gallons → US Pintsgal → ptUS Gallons → US Quartsgal → qt
Frequently asked questions
How do I convert US gallons to US fluid ounces?
Use the formula fl oz = gal × 128. For example, 10 gal = 1,280 fl oz.
What is 1 US gallon in US fluid ounces?
1 gal = 128 fl oz.
How do I convert US fluid ounces back to US gallons?
Use gal = fl oz × 0.0078125. 1 fl oz = 0.0078125 gal.