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Single conversion
To convert from Pound (lb) to Ounce (oz), use the following formula:
Let's convert 5 Pound (lb) to Ounce (oz).
Using the formula:
Therefore, 5 Pound (lb) is equal to Ounce (oz).
Here are some quick reference conversions from Pound (lb) to Ounce (oz):
| Pounds | Ounces |
|---|---|
| 0.000001 lb | oz |
| 0.001 lb | oz |
| 0.1 lb | oz |
| 1 lb | oz |
| 2 lb | oz |
| 3 lb | oz |
| 4 lb | oz |
| 5 lb | oz |
| 6 lb | oz |
| 7 lb | oz |
| 8 lb | oz |
| 9 lb | oz |
| 10 lb | oz |
| 20 lb | oz |
| 30 lb | oz |
| 40 lb | oz |
| 50 lb | oz |
| 100 lb | oz |
| 1000 lb | oz |
| 10000 lb | oz |
For all Weight converters, choose units using the From/To dropdowns above.
The pound (lb) is a basic unit of mass and weight in the imperial system. It's widely used in the United States and elsewhere to measure things like groceries, body weight, and shipping.
Have you ever wondered why we write "lb" for pound? The abbreviation has ancient Roman roots.
It originates from the Roman unit of mass, the libra, which is Latin for "scales" or "balance."
The whole Roman phrase was libra pondo, meaning "a pound by weight." While English speakers adopted the pondo part, which became the word "pound," the abbreviation "lb" was retained from the phrase "libra."
Not all pounds are created equal. The two most common types are the avoirdupois pound and the troy pound.
To ensure global consistency, the pound is officially defined in relation to the kilogram (kg), the base unit of mass in the metric system.
Since 1959, one pound has been internationally defined as exactly 0.45359237 kilograms.
This agreement ensures that a pound in the US is the same as a pound in the UK. For everyday calculations, you can remember that 1 pound is about 0.45 kg.
An ounce (oz) is a unit of mass in the imperial system, equal to 0.0625 (or 1/16) Pounds (lb).
While most people are familiar with the standard ounce used for groceries, there is another crucial measurement called the Troy Ounce.
The standard ounce, officially known as the Avoirdupois ounce, is approximately 28.35 grams and is used for weighing everyday items.
The Troy ounce, however, is slightly heavier, at approximately 31.1 grams, and is the universal standard for measuring precious metals, such as gold, silver, and platinum. This distinction is vital in the jewelry and investment markets.
A common point of confusion is the difference between an ounce (oz) and a fluid ounce (fl oz).
An ounce is a unit of mass (weight), while a fluid ounce is a unit of volume.
For example, you would use ounces to weigh a block of cheese but fluid ounces to measure a glass of milk. The weight of one fluid ounce of a liquid depends entirely on its density; one fluid ounce of honey, for instance, weighs more than one fluid ounce of water.
The word "ounce" comes from the Latin uncia.
In ancient Rome, an uncia was one-twelfth of a libra (the Roman pound), and that system helped shape many European measures.
Today's avoirdupois ounce is one-sixteenth of a pound. However, the name still preserves a direct link to Rome's old system of weights and measures.