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| Ounces (oz) | Gallons (gal) |
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Transform ounces (oz) to gallons (gal) or back again with this simple tool—perfect for cooking, home projects, or measuring liquids!
A fluid ounce (oz) is an imperial unit of volume, where 1 US fluid ounce equals 0.0078125 US gallons. A gallon (gal) is a larger imperial unit, equal to 128 ounces.
The fluid ounce originated from medieval British measurements, while the US gallon was standardized in the 19th century, derived from earlier English units.
Ounces are widely used in the US for small liquid measurements like recipes. Gallons are common for larger volumes, such as fuel, beverages, and bulk liquids.
One US gallon equals 128 US fluid ounces, making it easy to scale up or down your measurements.
This conversion is handy for cooking large batches, calculating fuel needs, or understanding product sizes in different units.
Yes, it’s based on the US gallon (128 oz). Note that the UK gallon (160 oz) differs, but this tool uses the US standard.