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Gallons to Fluid Ounces converter

Convert gal to fl oz instantly. Type any value and get the result in fluid ounces. 1 gal = 128 fl oz.

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Volume›gal → fl oz
From
To
result below ↓
1 gal=
128fl oz
formula1 gal = 128 fl oz

Common gallons → fluid ounces

=128 fl oz
=256 fl oz
=640 fl oz
=1,280 fl oz
=2,560 fl oz
=6,400 fl oz
=12,800 fl oz
=64,000 fl oz
=128,000 fl oz

Need a different value? .

Convert the other way
Fluid Ounces to Gallons

How to convert gallons to fluid ounces

To convert gallons to fluid ounces, multiply the value by 128.

Formula
fl oz = gal × 128

For example:

  • →5 gal = 640 fl oz
  • →100 gal = 12,800 fl oz

Quick reference

  • ▸1 gal = 128 fl oz
  • ▸1 fl oz = 0.0078125 gal

When you need to convert gal to fl oz

  • ·Cooking — recipes from different cuisines using different volume units.
  • ·Fuel — comparing fuel efficiency or filling up abroad.
  • ·Beverages — bottle and can sizes vary by region.
  • ·Chemistry — lab work and dilutions.
  • ·Gardening — watering and fertilizer ratios.

Frequently asked

How many fluid ounces are in 1 gallon?
One gallon equals 128 fluid ounces.
How do I convert gal to fl oz in my head?
Multiply the value in gallons by 128 to get fluid ounces.
What is the formula for gallons to fluid ounces?
fl oz = gal × 128.
What is the reverse — how many gallons in 1 fluid ounce?
One fluid ounce equals 0.0078125 gallons.

Related conversions

Fluid Ounces to Gallons
1 fl oz = 0.0078125 gal
Gallons to Milliliters
1 gal = 3,785.41 ml
Gallons to Liters
1 gal = 3.78541 L
Gallons to Teaspoons
1 gal = 768 tsp
Milliliters to Fluid Ounces
1 ml = 0.0338141 fl oz
Liters to Fluid Ounces
1 L = 33.8141 fl oz
Teaspoons to Fluid Ounces
1 tsp = 0.166667 fl oz
Tablespoons to Fluid Ounces
1 tbsp = 0.500002 fl oz
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