This converter allows you to quickly convert us gallons (gal)
into us fluid ounces (fl oz).
Simply enter a value, choose your units, and get an instant, accurate result.
US Gallon to US Fluid Ounce Conversion Table
US Gallon (gal)
US Fluid Ounce (fl oz)
1
128
2
256
5
640
10
1,280
20
2,560
50
6,400
100
12,800
200
25,600
500
64,000
1000
128,000
2000
256,000
5000
640,000
10000
1,280,000
20000
2,560,000
50000
6,400,000
100000
12,800,000
200000
25,600,000
500000
64,000,000
1000000
128,000,000
2000000
256,000,000
How to convert US Gallons to US Fluid Ounces?
To convert us gallons to us fluid ounces, multiply by the conversion factor:
Example: Convert 10 US Gallons to US Fluid Ounces
Frequently asked questions
How many us fluid ounces are in 1 us gallon?
1 US Gallon (gal) equals 128 us fluid ounces (fl oz).
How many us gallons are in 1 us fluid ounce?
1 US Fluid Ounce (fl oz) equals 0.0078125 us gallons (gal).
How do I convert us fluid ounces back to us gallons?
Use the swap button above to flip the converter, or type a value directly into the "US Fluid Ounce" field — this page converts in both directions instantly as you type, with no submit button needed.
Which is larger, us gallon or us fluid ounce?
1 US Gallon is larger — it takes 128 us fluid ounces to equal 1 us gallon.