A fluid ounce (US) is a unit of volume used to measure liquids in the U.S. customary system. It's abbreviated as fl oz and is commonly seen in cooking, nutrition labeling, and liquid packaging. One US fluid ounce is defined as 1/128 of a US gallon, which equals exactly 29.5735 milliliters.
Despite the term "ounce" also being used for weight, a fluid ounce specifically measures liquid volume. It's important to distinguish the two, especially in recipes or products where both liquid and solid measurements appear. The US fluid ounce is a standard unit across many industries, from beverages and sauces to cleaning products and personal care items,
Uses: The fluid ounce is widely used in everyday life throughout the United States. In the kitchen, it shows up in recipes for measuring water, milk, oil, and other liquids. You'll also find it on nutrition labels, drink containers, and liquid medicine bottles. Most bottled drinks sold in the U.S., from soda cans to sports drinks, are labeled in fluid ounces.
Outside the kitchen, fluid ounces are also used to measure everyday products like shampoo, lotion, and household cleaners. Packaging labels often list fluid ounces to help shoppers gauge how much liquid is inside each bottle. In pharmacies, you may still see fluid ounces on medication packaging, though many prescriptions now use milliliters for greater accuracy and consistency.
The gallon (US) is a large unit of volume used in the U.S. customary measurement system. One US gallon is equal to 128 US fluid ounces, or approximately 3.785 liters. It's commonly abbreviated as gal and is often used for measuring larger quantities of liquids in household and commercial settings.
As one of the largest common units for liquid measurement in the United States, the gallon is widely recognized for storing and transporting liquids like milk, water, and gasoline. Its size makes it practical for bulk quantities and remains a standard unit in industries ranging from agriculture to retail packaging.
Uses: In everyday life, the US gallon is most commonly seen on milk jugs, bottled water, and fuel pumps. Whether you're filling up a gas tank or picking up a gallon of juice at the grocery store, this unit is a familiar part of American routines.
Beyond the home, the gallon is used across industries that handle large volumes—such as food service, chemical production, and farming. It's also a staple in recipes or instructions for making batches of beverages, soups, or cleaning solutions. Thanks to its capacity and widespread use, the gallon remains one of the most practical and recognizable units for measuring liquids in bulk.
1 fl oz = 0.007812 gal
Let’s say you want to convert 100 fl oz to gal.
Using the formula:
100 × 0.007812 = 0.781 gal
So, 100 fl oz is approximately 0.781 gal.
| Fluid Ounce (US) (fl oz) | Gallon (US) (gal) |
|---|---|
| 1 fl oz | 0.008 gal |
| 2 fl oz | 0.016 gal |
| 3 fl oz | 0.023 gal |
| 4 fl oz | 0.031 gal |
| 5 fl oz | 0.039 gal |
| 6 fl oz | 0.047 gal |
| 7 fl oz | 0.055 gal |
| 8 fl oz | 0.062 gal |
| 9 fl oz | 0.07 gal |
| 10 fl oz | 0.078 gal |
| 11 fl oz | 0.086 gal |
| 12 fl oz | 0.094 gal |
| 13 fl oz | 0.102 gal |
| 14 fl oz | 0.109 gal |
| 15 fl oz | 0.117 gal |