How many ounces are in a US gallon?

How many ounces are in a US gallon?

• A. 128
• B. 120
• C. 100
• D. 144

Answer: (A)

Think in terms of how a US gallon is built from smaller US units. A gallon equals 4 quarts, each quart equals 2 pints, and each pint equals 16 fluid ounces. Multiply these: 4 × 2 × 16 = 128. So there are 128 fluid ounces in a US gallon. This is about volume, not weight. The other numbers don’t fit the standard chain of conversions (8 pints in a gallon times 16 ounces per pint gives 128; 144 would be 9 pints, which is more than a gallon).

Think in terms of how a US gallon is built from smaller US units. A gallon equals 4 quarts, each quart equals 2 pints, and each pint equals 16 fluid ounces. Multiply these: 4 × 2 × 16 = 128. So there are 128 fluid ounces in a US gallon. This is about volume, not weight. The other numbers don’t fit the standard chain of conversions (8 pints in a gallon times 16 ounces per pint gives 128; 144 would be 9 pints, which is more than a gallon).