volume conversion
How many fluid ounces are in 1 gallon?
Quick answer, a live calculator, and reference values—built for fast, mobile-friendly lookups.
Main answer
1 gallon = 128 fluid ounces
Result
1 gallon = 128 fluid ounces
Factor: 128
There are 128 fluid ounces in 1 gallon.
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Examples
- 1 gallon128 fluid ounces
- 5 gallons640 fluid ounces
- 10 gallons1,280 fluid ounces
- 100 gallons12,800.01 fluid ounces