US gallon to US fluid ounce Converter
Convert us gallons to us fluid ounces with this free volume converter. The exact relationship used on this page is 1 us gallon = 128 us fluid ounces. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: US fluid ounce = US gallon × 128
How to convert us gallons to us fluid ounces
- Enter the value in us gallons in the converter.
- Read the equivalent amount in us fluid ounces.
- Use the swap link if you need us fluid ounce to us gallon instead.
- Check the table for common values without typing.
Worked examples
- 1 gal = 128 fl oz
- 5 gal = 640 fl oz
- 10 gal = 1,280 fl oz
- 25 gal = 3,200 fl oz
Conversion table
Common us gallons values converted to us fluid ounces.
| gal | fl oz |
|---|---|
| 1 | 128 |
| 2 | 256 |
| 3 | 384 |
| 4 | 512 |
| 5 | 640 |
| 6 | 768 |
| 7 | 896 |
| 8 | 1,024 |
| 9 | 1,152 |
| 10 | 1,280 |
| 20 | 2,560 |
| 50 | 6,400 |
| 100 | 12,800 |
| 250 | 32,000 |
| 500 | 64,000 |
| 1,000 | 128,000 |
About this conversion
US gallon (gal) and US fluid ounce (fl oz) are both volume units. Volume tools cover cooking cups and spoons, US and UK gallons, liters, milliliters, and cubic meters or feet. Bookmark this URL when you convert us gallons to us fluid ounces often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the us fluid ounce to us gallon converter.
FAQ
How many us fluid ounces are in 1 us gallon?+
1 us gallon equals 128 us fluid ounces.
What is the formula to convert us gallons to us fluid ounces?+
US fluid ounce = US gallon × 128
How do I convert us gallons to us fluid ounces by hand?+
Multiply the us gallon value by 128. Example: 10 us gallons × 128 = 1280 us fluid ounces.
Is this gal to fl oz converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.