# Pounds Conversion

The pound is a unit used to measure weight. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about pounds.

## Pound Conversion Calculators

Choose a unit of weight to convert to.

**US Customary & Imperial Units**

**SI Units**

**Other Units**

## Pound Definition and Usage

One pound is defined as a unit of mass/weight equal to 16 ounces, or 0.45359237 kilograms.
One pound is equal to 7,000 grains in the avoirdupois or apothecaries' systems.^{[1]}

The pound is a US customary and imperial unit of weight. A pound is sometimes also referred to as a common ounce. Pounds can be abbreviated as *lb*, and are also sometimes abbreviated as *lbs*, *lb _{m}*, or

*#*. For example, 1 pound can be written as 1 lb, 1 lbs, 1 lb

_{m}, or 1 #.

### Background and Origin

The pound originates from the libra, which is where the abbreviation "lb" comes from.
The libra was a Roman unit of mass equal to 328.9 grams, or about 123 ounces.^{[2]}

Over time, the libra was replaced by variations of the pound, such as the tower pound and the troy pound. Eventually it evolved into the modern variation, the avoirdupois pound.

## Pounds Measurement Conversion Table

pounds | tons | ounces | metric tons | long tons | kilograms | grams | milligrams | carats |
---|---|---|---|---|---|---|---|---|

1 lb | 0.0005 t | 16 oz | 0.000454 t | 0.000446 lt | 0.453592 kg | 453.59237 g | 453,592 mg | 2,268 ct |

2 lb | 0.001 t | 32 oz | 0.000907 t | 0.000893 lt | 0.907185 kg | 907.18474 g | 907,185 mg | 4,536 ct |

3 lb | 0.0015 t | 48 oz | 0.001361 t | 0.001339 lt | 1.360777 kg | 1,361 g | 1,360,777 mg | 6,804 ct |

4 lb | 0.002 t | 64 oz | 0.001814 t | 0.001786 lt | 1.814369 kg | 1,814 g | 1,814,369 mg | 9,072 ct |

5 lb | 0.0025 t | 80 oz | 0.002268 t | 0.002232 lt | 2.267962 kg | 2,268 g | 2,267,962 mg | 11,340 ct |

6 lb | 0.003 t | 96 oz | 0.002722 t | 0.002679 lt | 2.721554 kg | 2,722 g | 2,721,554 mg | 13,608 ct |

7 lb | 0.0035 t | 112 oz | 0.003175 t | 0.003125 lt | 3.175147 kg | 3,175 g | 3,175,147 mg | 15,876 ct |

8 lb | 0.004 t | 128 oz | 0.003629 t | 0.003571 lt | 3.628739 kg | 3,629 g | 3,628,739 mg | 18,144 ct |

9 lb | 0.0045 t | 144 oz | 0.004082 t | 0.004018 lt | 4.082331 kg | 4,082 g | 4,082,331 mg | 20,412 ct |

10 lb | 0.005 t | 160 oz | 0.004536 t | 0.004464 lt | 4.535924 kg | 4,536 g | 4,535,924 mg | 22,680 ct |

11 lb | 0.0055 t | 176 oz | 0.00499 t | 0.004911 lt | 4.989516 kg | 4,990 g | 4,989,516 mg | 24,948 ct |

12 lb | 0.006 t | 192 oz | 0.005443 t | 0.005357 lt | 5.443108 kg | 5,443 g | 5,443,108 mg | 27,216 ct |

13 lb | 0.0065 t | 208 oz | 0.005897 t | 0.005804 lt | 5.896701 kg | 5,897 g | 5,896,701 mg | 29,484 ct |

14 lb | 0.007 t | 224 oz | 0.00635 t | 0.00625 lt | 6.350293 kg | 6,350 g | 6,350,293 mg | 31,751 ct |

15 lb | 0.0075 t | 240 oz | 0.006804 t | 0.006696 lt | 6.803886 kg | 6,804 g | 6,803,886 mg | 34,019 ct |

16 lb | 0.008 t | 256 oz | 0.007257 t | 0.007143 lt | 7.257478 kg | 7,257 g | 7,257,478 mg | 36,287 ct |

17 lb | 0.0085 t | 272 oz | 0.007711 t | 0.007589 lt | 7.71107 kg | 7,711 g | 7,711,070 mg | 38,555 ct |

18 lb | 0.009 t | 288 oz | 0.008165 t | 0.008036 lt | 8.164663 kg | 8,165 g | 8,164,663 mg | 40,823 ct |

19 lb | 0.0095 t | 304 oz | 0.008618 t | 0.008482 lt | 8.618255 kg | 8,618 g | 8,618,255 mg | 43,091 ct |

20 lb | 0.01 t | 320 oz | 0.009072 t | 0.008929 lt | 9.071847 kg | 9,072 g | 9,071,847 mg | 45,359 ct |

## References

- Encyclopædia Britannica, Avoirdupois weight, https://www.britannica.com/science/avoirdupois-weight
- Arika Okrent, Why are pound and ounce abbreviated as 'lb' and 'oz'?,
*The Week*, https://theweek.com/articles/461362/why-are-pound-ounce-abbreviated-lb-oz