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Pounds - Kilograms Converter

- By Dr. Minas E. Lemonis, PhD - Updated: February 28, 2024

Enter the mass in either of the next two fields and get it converted instantly!

Kilograms [kg]:
Pounds [lb]:
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Definitions

Table of contents

Pound of mass

The pound is a unit of mass according to the Imperial and US customary systems of units. Many definitions of the pound can be found throughout history, but today the international (avoirdupois) pound is standardized as exactly 0.45359237 kilograms. The symbol used for pound is 'lb' (from the Roman libra that is the equivalent to pound mass unit). Sometimes the lbm or lb-m abbreviation is used to distinguish it from the lbf or lb-f pound, which is a unit of force.

The relationships of pound to other mass units are shown in the following table:

UnitSymbol[lb]
Graingr \frac{1}{7000}
Dramdr \frac{1}{256}
Ounceoz \frac{1}{16}
Ton (short)cwt 2000
Kilogramkg \frac{1}{0.45359237}\approx 2.204623
Metric tonnetn \frac{1000}{0.45359237}\approx 2204.623

Kilogram

Kilogram [kg] is a unit of mass according to the SI system of units. It was originally conceived as the mass of pure water included in a volume equal to 1 litre (10cm x 10cm x 10cm cube), at a temperature of 4°C (triple point of water). Today, it is defined as the mass that is equal to the mass of a particular prototype specimen, preserved by the International Bureau of Weights and Measures. Although kilogram is the base SI unit of mass, the SI multiple and fraction mass units are defined relative to the gram [g], because the word kilogram already contains the prefix 'kilo-' (for 1000). One kilogram is equal to 1000 grams.

The relationship of kilogram [kg] with other mass units are shown in the following table:

UnitSymbol[kg]
Nanogramng 10^{-12}
Microgramμg 10^{-9}
Milligrammg 10^{-6}
Gramg 0.001
Megagram (tonne)Mg (t) 1000
Poundlb 0.45359237
Ounceoz \frac{0.45359237}{16} \approx 0.0283495

How to convert pounds to kilograms (lb to kg)

  • Multiply mass in lb with 0.45359237
  • The result is the mass in kilograms

For example 400lb is 400x0.45359237 = 181.436948 kg

How to convert kilograms to pounds (kg to lb)

  • Divide mass in kg by 0.45359237
  • The result is the mass in lb

For example 100 kg is 100/0.45359237 ≈ 220.4623 lb

Conversion table from lb to kg

In the following table some typical masses in pounds are converted to kilograms:

[lb][kg]
0.250.1134
0.50.2268
0.750.3402
10.4536
20.9072
31.361
41.814
52.268
62.722
73.175
83.629
94.082
104.536
125.443
156.804
209.072
2511.34
3013.61
3515.88
4018.14
4520.41
5022.68
6027.22
7031.75
8036.29
9040.82
10045.36
15068.04
20090.72

Conversion table from [kg] to [lb]

In the following table some typical masses in kilograms are converted to pounds:

[kg][lb]
0.250.5512
0.51.102
0.751.653
12.205
24.409
36.614
48.818
511.02
613.23
715.43
817.64
919.84
1022.05
1226.46
1533.07
2044.09
2555.12
3066.14
3577.16
4088.18
4599.21
50110.2
60132.3
70154.3
80176.4
90198.4
100220.5
150330.7
200440.9
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See also
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kNm - kip ft converter
Feet-metres converter
Inches-cm converter
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All quick Converters
All Unit Converters