1 kilograms is equal to
= 2.20462442018 pounds

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Mass-Weight

In physics, mass is a property of a physical body. It is the measure of an object's resistance to acceleration (a change in its state of motion) when a force is applied. It also determines the strength of its mutual gravitational attraction to other bodies. In the theory of relativity a related concept is the mass–energy content of a system. The SI unit of mass is the kilogram (kg).

Mass is not the same as weight, even though we often calculate an object's mass by measuring its weight with a spring scale, rather than comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force.

The standard International System of Units (SI) unit of mass is the kilogram (kg). The kilogram is 1000 grams (g), first defined in 1795 as one cubic decimeter of water at the melting point of ice. Then in 1889, the kilogram was redefined as the mass of the international prototype kilogram, and as such is independent of the meter, or the properties of water. As of January 2013, there are several proposals for redefining the kilogram yet again, including a proposal for defining it in terms of the Planck constant.

Mass unitsSymbolDefinitionRelation to SI units
atomic mass unit, unifiedu; AMU ≈ 1.660538921(73)×10−27 kg
atomic unit of mass, electron rest massme ≈ 9.10938291(40)×10−31 kg
bag (coffee) ≡ 60 kg= 60 kg
bag (Portland cement) ≡ 94 lb av= 42.63768278 kg
barge ≡  22 1⁄2 short ton= 20411.65665 kg
caratkt≡  3 1⁄6 gr= 205.1965483 mg
carat (metric)ct≡ 200 mg= 200 mg
clove ≡ 8 lb av= 3.62873896 kg
crith  ≈ 89.9349 mg
daltonDa ≈ 1.660538921(73)×10−27 kg
dram (apothecary; troy)dr t≡ 60 gr= 3.8879346 g
dram (avoirdupois)dr av≡  27 11⁄32 gr= 1.7718451953125 g
electronvolteV≡ 1 eV (energy unit) / c2= 1.78266184(45)×10−36 kg
gammaγ≡ 1 μg= 1 μg
graingr≡  1⁄7000 lb av≡ 64.79891 mg
gravegv.grave was the original name of the kilogram≡ 1 kg
hundredweight (long)long cwt or cwt≡ 112 lb av= 50.80234544 kg
hundredweight (short); centalsh cwt≡ 100 lb av= 45.359237 kg
kilogramkg≡ mass of the prototype near Paris (≈ mass of 1 L of water)≡ 1 kg (SI base unit)
kipkip≡ 1000 lb av= 453.59237 kg
mark ≡ 8 oz t= 248.8278144 g
mite ≡  1⁄20 gr= 3.2399455 mg
mite (metric) ≡  1⁄20 g= 50 mg
ounce (apothecary; troy)oz t≡  1⁄12 lb t= 31.1034768 g
ounce (avoirdupois)oz av≡  1⁄16 lb= 28.349523125 g
ounce (US food nutrition labelling)oz≡ 28 g= 28 g
pennyweightdwt; pwt≡  1⁄20 oz t= 1.55517384 g
point ≡  1⁄100 ct= 2 mg
pound (avoirdupois)lb av≡ 0.45359237 kg = 7000 grains≡ 0.45359237 kg
pound (metric) ≡ 500 g= 500 g
pound (troy)lb t≡ 5760 grains= 0.3732417216 kg
quarter (imperial) ≡  1⁄4 long cwt = 2 st = 28 lb av= 12.70058636 kg
quarter (informal) ≡  1⁄4 short ton= 226.796185 kg
quarter, long (informal) ≡  1⁄4 long ton= 254.0117272 kg
quintal (metric)q≡ 100 kg= 100 kg
scruple (apothecary)s ap≡ 20 gr= 1.2959782 g
sheet ≡  1⁄700 lb av= 647.9891 mg
slug; geepound; hylslug≡ 1 ɡ0 × 1 lb av × 1 s2/ft≈ 14.593903 kg
stonest≡ 14 lb av= 6.35029318 kg
ton, assay (long)AT≡ 1 mg × 1 long ton ÷ 1 oz t= 32.6 g
ton, assay (short)AT≡ 1 mg × 1 short ton ÷ 1 oz t= 29.16 g
ton, longlong tn or ton≡ 2240 lb= 1016.0469088 kg
ton, shortsh tn≡ 2000 lb= 907.18474 kg
tonne (mts unit)t≡ 1000 kg= 1000 kg
wey ≡ 252 lb = 18 st= 114.30527724 kg
ZentnerZtr.Definitions vary.