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.
A cubic inch is a unit of volume used in the imperial and U.S. customary systems. It represents the space occupied by a cube, with each side measuring exactly one inch. One cubic inch is equal to 16.387 milliliters or approximately 0.0005787 cubic feet, and it's abbreviated as in³.
The cubic inch is often used to measure smaller volumes in areas like automotive design, mechanical components, and product manufacturing. It’s a go-to unit for things like engine size, compact storage, and custom parts where detailed, space-specific measurements are needed.
Uses: The cubic inch is most widely recognized in the automotive world, where it's often used to express engine size—especially in classic American vehicles. It's also used in engineering and manufacturing for parts design, packaging, and product specifications where precision is important.
In everyday use, you might see cubic inches listed when measuring the internal dimensions of a drawer, estimating the volume of a small box, or comparing product capacities. It remains a trusted unit for capturing volume in tight spaces where accuracy matters.
1 fl oz = 1.804682 in³
Let’s say you want to convert 100 fl oz to in³.
Using the formula:
100 × 1.804682 = 180.468 in³
So, 100 fl oz is approximately 180.468 in³.
| Fluid Ounce (US) (fl oz) | Cubic inch (in³) |
|---|---|
| 1 fl oz | 1.805 in³ |
| 2 fl oz | 3.609 in³ |
| 3 fl oz | 5.414 in³ |
| 4 fl oz | 7.219 in³ |
| 5 fl oz | 9.023 in³ |
| 6 fl oz | 10.828 in³ |
| 7 fl oz | 12.633 in³ |
| 8 fl oz | 14.437 in³ |
| 9 fl oz | 16.242 in³ |
| 10 fl oz | 18.047 in³ |
| 11 fl oz | 19.851 in³ |
| 12 fl oz | 21.656 in³ |
| 13 fl oz | 23.461 in³ |
| 14 fl oz | 25.266 in³ |
| 15 fl oz | 27.07 in³ |