Pounds Conversion

Scales are used to measure weight

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

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

Common pound values and equivalent imperial and metric weight measurements
pounds tons ounces metric tons long tons kilograms grams milligrams carats calories stones
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 3,500 kcal 0.071429 st
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 7,000 kcal 0.142857 st
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 10,500 kcal 0.214286 st
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 14,000 kcal 0.285714 st
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 17,500 kcal 0.357143 st
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 21,000 kcal 0.428571 st
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 24,500 kcal 0.5 st
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 28,000 kcal 0.571429 st
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 31,500 kcal 0.642857 st
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 35,000 kcal 0.714286 st
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 38,500 kcal 0.785714 st
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 42,000 kcal 0.857143 st
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 45,500 kcal 0.928571 st
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 49,000 kcal 1 st
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 52,500 kcal 1.071429 st
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 56,000 kcal 1.142857 st
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 59,500 kcal 1.214286 st
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 63,000 kcal 1.285714 st
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 66,500 kcal 1.357143 st
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 70,000 kcal 1.428571 st

References

  1. Encyclopædia Britannica, Avoirdupois weight, https://www.britannica.com/science/avoirdupois-weight
  2. 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