Convert LB To KG

Please enter a value below to convert pounds to kilograms:

In order to do a reverse conversion from kilograms to pounds clear values in the above fields and input the value in the “Kilograms” field or go to kilograms to pounds converter page.

Fact about Pound

Basic facts:  A pound is a unit of mass used in the United States customary and imperial systems of measurement. Its symbol is [lb.]. The common pound used today is the international avoirdupois pound. It is defined as precisely 0.45359237 kilograms. One avoirdupois pound is equal to 16 (sixteen) avoirdupois ounces.

History: Prior to the international avoirdupois pound that is widely used today, numerous different definitions of the pound were used throughout history. The pound descended from the Roman libra. The avoirdupois system was commonly used in the 13th century. In 1959, it was updated to its current form. This system was based on a physical standardized pound that used a prototype weight. This prototype weight could be divided into a number that had three even divisors [8, 4, 2] i.e., 16 ounces.

Use: In the United States, the pound as a unit of weight is widely used, often for measuring body weight. Many versions of the pound existed in the past in the UK, and although the United Kingdom largely uses the International System of Units, pounds are still used within specific contexts, such as labeling of packaged foods [by law the metric values must also be displayed]. The United Kingdom also often uses both pounds and stones when defining body weight, where a stone is comprised of 14 (fourteen) pounds.

Fact about Kilogram

Baci fact: A kilogram [symbol: kg] is the base unit of mass in the SI (International System of Units). It is also known as “kilogramme.” Based on fixed fundamental constants of nature, the kilogram nowadays is defined in terms of the second and the meter. The actual size of the unit remained the same, even though the definition of the kilogram was changed in 2019. Mentioned changes were intended to enhance the definitions of SI base units.

History: The name of this mass unit was derived from the French [kilogramme], which in turn came from adding Greek terminology meaning [a thousand] before the Late Latin term [gramma] that meant “a small weight.”

With an SI prefix, the kilogram is the only SI base unit. SI is a system based on the system of units: meter-kilogram-second rather than a centimeter-gram-second system. This is at least partly due to the lack of coherence and inconsistencies that can occur through the use of centimeter-gram-second systems, like those between the systems of electromagnetic and electrostatic units.

In 1794, the kilogram was initially defined as the mass of one liter of water at its freezing point, though, ultimately defined, since measuring the mass of a volume of water was cumbersome and imprecise.

In 2019, based on Planck’s constant and changes to the definition of the second, a new definition of the kilogram was introduced. Prior to that definition, the kilogram was defined as being equivalent to the mass of a physical prototype, a cylinder made of a platinum-iridium alloy, which was an inadequate measure. The mass of the initial prototype for the kilogram now weighs 50 micrograms less than other copies of the standard kilogram.

Use: The kilogram is used globally in almost all fields and applications, with the exception of countries like the United States, where the kilogram is used in many areas, at least to some degree [such as science, government, industry, and the military] but normally not in everyday applications.

How many kilograms in a lb? 

1 lb is equivalent to 0.45359237 kilograms. Use 0.45359237 as the factor to convert pounds to kilograms. Below find some popular pounds to kilograms conversion questions:

• How many kilograms in 2 pounds?  2 pounds x 0.45359237 = 0.90718474 number kilograms
• How many kilograms in 3 pounds?  3 pounds x 0.45359237 = 1.36077711 number kilograms
• How many kilograms in 5 pounds?  5 pounds x 0.45359237 = 2.26796185 number kilograms
• How many kilograms in 10 pounds? 10 pounds x 0.45359237 = 4.5359237 number kilograms
• How many kilograms in 20 pounds? 20 pounds x 0.45359237 = 9.0718474 number kilograms
• How many kilograms in 50 pounds? 50 pounds x 0.45359237 = 22.6796185 number kilograms
• How many kilograms in 100 pounds? 100 pounds x 0.45359237 = 45.359237 number kilograms
• How many kilograms in 1000 pounds? 1000 pounds x 0.45359237 = 453.59237 number kilograms

Pounds to Kilograms Conversion Chart

Pounds	Kilograms	Pounds	Kilograms	Pounds	Kilograms	Pounds	Kilograms
1	0.45359237	26	11.79340162	51	23.13321087	76	34.47302012
2	0.90718474	27	12.24699399	52	23.58680324	77	34.92661249
3	1.36077711	28	12.70058636	53	24.04039561	78	35.38020486
4	1.81436948	29	13.15417873	54	24.49398798	79	35.83379723
5	2.26796185	30	13.6077711	55	24.94758035	80	36.2873896
6	2.72155422	31	14.06136347	56	25.40117272	81	36.74098197
7	3.17514659	32	14.51495584	57	25.85476509	82	37.19457434
8	3.62873896	33	14.96854821	58	26.30835746	83	37.64816671
9	4.08233133	34	15.42214058	59	26.76194983	84	38.10175908
10	4.5359237	35	15.87573295	60	27.2155422	85	38.55535145
11	4.98951607	36	16.32932532	61	27.66913457	86	39.00894382
12	5.44310844	37	16.78291769	62	28.12272694	87	39.46253619
13	5.89670081	38	17.23651006	63	28.57631931	88	39.91612856
14	6.35029318	39	17.69010243	64	29.02991168	89	40.36972093
15	6.80388555	40	18.1436948	65	29.48350405	90	40.8233133
16	7.25747792	41	18.59728717	66	29.93709642	91	41.27690567
17	7.71107029	42	19.05087954	67	30.39068879	92	41.73049804
18	8.16466266	43	19.50447191	68	30.84428116	93	42.18409041
19	8.61825503	44	19.95806428	69	31.29787353	94	42.63768278
20	9.0718474	45	20.41165665	70	31.7514659	95	43.09127515
21	9.52543977	46	20.86524902	71	32.20505827	96	43.54486752
22	9.97903214	47	21.31884139	72	32.65865064	97	43.99845989
23	10.43262451	48	21.77243376	73	33.11224301	98	44.45205226
24	10.88621688	49	22.22602613	74	33.56583538	99	44.90564463
25	11.33980925	50	22.6796185	75	34.01942775	100	45.359237

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