Is 64 oz Half a Gallon? Unpacking Common Liquid Measurements
                                
                                
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                                    3 min read                                
                            
                                According to the US Customary System, there are 128 fluid ounces in one gallon. Given this standard, it is mathematically straightforward to conclude that 64 oz is indeed half a gallon. This simple conversion can be helpful for everything from cooking to tracking your daily hydration goals.