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  • Type your value into appropriate edit box.
  • Converter will translate the value into other systems automatically as you type.
Accuracy - number of significant decimal digits:
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Metric SystemImperial & US System
milligram [mg] ounce [oz]
gram [g] pound [lb]
decagram [dag] stone
kilogram [kg] US hundredweight [cwt]
metric tonne [T] Imp. hundredweight [cwt]
Other short ton [S/T]
carat [ct] long ton [L/T]
quintal [q] grain [gr]

Atomic Mass Unit [u],[amu] or [Da]
Planck Mass
Examples of different masses
Electron Mass Proton Mass Neutron Mass Carbon C12  Cullinan Diamond Lunar Mass Earth Mass Jupiter Mass Solar Mass To see description put the mouse cursor over left side of this window .

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Mass of the Electron

Electron Mass is equal 9.11*10-31kg (0.0005u, 0.511 MeV/c2) and it is approximately 1/1836 of proton mass.
Mass of the Proton

Proton Mass is equal 1.6726*10-27kg (1.0073u, 938.272 MeV/c2) an it is approximately equal to neutron mass and approximately 1836 times greater then the mass of an electron.
Mass of the Neutron

Neutron Mass is approximately equal to proton mass and is equal 1,6748*10-27 (939,55 MeV/c2, 1.0087u).
Carbon C12 Mass

Carbon isotop C12 contains 6 neutrons and 6 protons. Its mass is used as a base to define an Atomic Mass Unit and its 12u by definition. (Earlier Atomic Mass Unit was defined as 1/16 of O16)
Mass of the Moon

Lunar Mass is widely used in astronomy to describe masses of other moons. Lunar Mass is approximately equal 7.3477 × 1022 kg or 1.62 × 1023 pounds
Mass of the Earth

Earth Mass is widely used in astronomy to describe masses of other planets. Earth Mass is approximately equal 5.9736 × 1024 kg or 1.32 × 1025 pounds
Mass of the planet Jupiter

Jupiter Mass is widely used in astronomy to describe masses of other planets, gas giants and extrasolar planets. Jupiter Mass is approximately equal 1.8986 × 1027 kg or 4.1857 × 1027 pounds The Jupiter was choosen as a base because it is the largest planet in our solar system.
Mass of the Sun

Solar Mass is widely used in astronomy to describe masses of other stars and galaxies. Solar Mass is approximately equal 1.9889 × 1030 kg or 4.3848 × 1030 pounds
Cullinan Diamond Mass

The Cullinan Diamond is the largest diamond ever found. Its mass was 3106.75 ca (carats) (621.35 grams, 1.3698 pounds). The famous Koh-i-noor diamond weights 'only' 105 ca (21 grams, 0.0463 pounds) The stone was found in Cullinan, Gauteng, South Africa, on January 25, 1905 by Frederick Wells. It was divided into 9 large and 96 smaller stones by Joseph Asscher. The largest part named 'Great Star of Africa' or Cullinan I weights 530.2 ca.
Kilogram vs. Pound Example
If your weight or mass is given in kilograms and you want to know pound weight/mass, you should type quantity of kilograms in the edit box labeled 'kilogram'. You will get pound weight in the edit box labeled 'pound [lb]'. On the other hand, if you want to know kilogram weight (or tonne, long ton, stone, carat weight) of any substance/item knowing how many pounds it weights, simply type the pound weight into the edit box labeled 'pound [lb]' and the system will give you an answer.

Fundamental unit of mass in the International System Of Units (SI) is:
kilogram [kg]
UnitIn kilograms
Metric System
milligram [mg]0.000001
gram [g]0.001
decagram [dkg]0.01
kilogram [kg]1
metric ton1000
Us & Imperial System
ounce [oz]0.028349523
pound [lb]0.45359237
US hundredweight [cwt]45.359237
Imperial hundredweight [cwt]50.80234544
short Ton [S/T]907.18474
long Ton [L/T]1016.0469088
grain [gr]0.00006479891
carat [ct]0.0002
quintal [q]100

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