VOLUME CONVERSION
US gallon to US fluid ounce.
Convert us gallon (gal (US)) to us fluid ounce (fl oz (US)), with the math explained.
1 gal (US) = 128 fl oz (US)
US and UK gallons, pints, and fluid ounces are different sizes. A metric cup is 250 mL; a US customary cup is 236.5882365 mL.
THE MATH, MADE SIMPLE
How to convert us gallon to us fluid ounce
Multiply your us gallon value by 128 to get the equivalent in us fluid ounce. Both units are normalized through the liter.
fl oz (US) = gal (US) × 12810 gal (US) = 1,280 fl oz (US)
Result rounded to 12 significant digits. Change the precision in the calculator to suit your task.US and UK gallons, pints, and fluid ounces are different sizes. A metric cup is 250 mL; a US customary cup is 236.5882365 mL.
QUICK REFERENCE
gal (US) to fl oz (US) conversion table
| US gallon (gal (US)) | US fluid ounce (fl oz (US)) |
|---|---|
| 1 gal (US) | 128 fl oz (US) |
| 2 gal (US) | 256 fl oz (US) |
| 5 gal (US) | 640 fl oz (US) |
| 10 gal (US) | 1,280 fl oz (US) |
| 20 gal (US) | 2,560 fl oz (US) |
| 50 gal (US) | 6,400 fl oz (US) |
| 100 gal (US) | 12,800 fl oz (US) |
| 500 gal (US) | 64,000 fl oz (US) |
| 1,000 gal (US) | 128,000 fl oz (US) |
About the us gallon
The us gallon (gal (US)) is a unit of volume. One us gallon equals 3.785411784 liter (base unit) in this calculator.
All us gallon conversionsAbout the us fluid ounce
The us fluid ounce (fl oz (US)) is a unit of volume. One us fluid ounce equals 0.0295735295625 liter (base unit) in this calculator.
All us fluid ounce conversionsCommon questions
What is 1 gal (US) in fl oz (US)?
One us gallon equals 128 fl oz (US). Use the formula above for other values.
Why might another calculator show a different last digit?
Calculators may round at different stages or use different unit conventions. We keep full JavaScript numeric precision during calculation and round only for display. Choose up to 15 significant digits. Check US versus UK units and the notes for this category.
BROWSE BY UNIT