A US gallon of water weighs about 8.34 pounds, or roughly 133.4 ounces by weight, near room temperature.
How Many Ounces Are in a Gallon of Water by Weight: explained
This is different from its 128 US fluid ounces of volume.
Water density varies slightly with temperature.
Useful reference
Choose the correct unit system and assumptions before calculating. Exact conversions are better than rounded shortcuts when precision matters.
When the answer can differ
Never use fluid-ounce and weight-ounce figures interchangeably.
Common questions
What should I remember?
A US gallon of water weighs about 8.34 pounds, or roughly 133.4 ounces by weight, near room temperature.
What is an easy mistake to avoid?
Never use fluid-ounce and weight-ounce figures interchangeably.
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