US Gallon to US Fluid Ounce Converter
Convert US Gallon (gal) to US Fluid Ounce (fl-oz) instantly with this volume converter. Use the calculator above, then check the formula, worked examples, table, and manual steps below.
Formula
fl-oz = gal × 128
Multiply the US Gallon value by 128 to get the equivalent value in US Fluid Ounce.
Example Conversions
1 US Gallon (gal)
128 US Fluid Ounce (fl-oz)
5 US Gallon (gal)
640 US Fluid Ounce (fl-oz)
10 US Gallon (gal)
1280 US Fluid Ounce (fl-oz)
25 US Gallon (gal)
3200 US Fluid Ounce (fl-oz)
100 US Gallon (gal)
12800 US Fluid Ounce (fl-oz)
Conversion Table
| US Gallon (gal) | US Fluid Ounce (fl-oz) |
|---|---|
| 0.1 | 12.8 |
| 0.5 | 64 |
| 1 | 128 |
| 2 | 256 |
| 5 | 640 |
| 10 | 1280 |
| 25 | 3200 |
| 50 | 6400 |
| 100 | 12800 |
| 250 | 32000 |
| 500 | 64000 |
| 1000 | 128000 |
How to Convert Manually
Use these steps to convert US Gallon values to US Fluid Ounce without the calculator.
- Write down the value in US Gallon (gal) that you want to convert.
- Multiply that value by 128.
- For example, 10 US Gallon × 128 = 1280 US Fluid Ounce.
- Label the result as US Fluid Ounce (fl-oz).
Relative Size Comparison
This chart shows the visual difference in size between exactly one US Gallon and one US Fluid Ounce.
About US Gallon and US Fluid Ounce
Converting US Gallon to US Fluid Ounce is common in volume applications, engineering, and everyday life. Whether you are translating specifications from international manuals, completing homework, or planning a project, having an accurate gal to fl-oz calculation ensures your measurements are correct.
The US Gallon is a unit of volume. One US Gallon equals 3.785411784 l in this converter's base scale.
The US Fluid Ounce is also a volume unit. One US Fluid Ounce equals 0.02957352956 l in the same base scale.
Precision and Rounding: When converting US Gallon to US Fluid Ounce, you may encounter long decimal numbers. For most practical purposes, rounding to two or three decimal places is sufficient. However, for machining, scientific research, or strict engineering tolerances, you should maintain as much precision as possible before your final calculation.
Worked Example
15 US Gallon equals 1920 US Fluid Ounce.
15 gal × 128 = 1920 fl-oz
FAQ
How do I convert US Gallon to US Fluid Ounce?
Multiply the US Gallon value by 128 to get the equivalent value in US Fluid Ounce.
What is the formula for US Gallon to US Fluid Ounce?
The formula is fl-oz = gal × 128.
How many US Fluid Ounce are in 1 US Gallon?
1 US Gallon equals 128 US Fluid Ounce.
Can I convert US Fluid Ounce back to US Gallon?
Yes. 1 US Fluid Ounce equals 0.0078125 US Gallon, and the related converter can reverse the calculation.
What are common names for US Gallon and US Fluid Ounce?
US Gallon is shown as gal and may also be searched as gallons, us gallons. US Fluid Ounce is shown as fl-oz and may also be searched as fluid ounces, fl oz, us fl oz.
Was this page helpful?
Let us know if this converter met your needs.