Online Weight/Mass Converter

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Weight/Mass Converter

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Microgram (ug)
Milligram (mg)
Kilogram (kg)
Pound (lb)
Ounce (oz)
Gram (g)
Carat (ct)
Metric Ton (t)
Short Ton (ton)
Long Ton (lt)
Stone (st)

Early the kilogram was defined as the mass of a cubic decimeter water. Since 1901 is the kilogram a block of platinum-iridium saved in France. One liter water weights according the present norms 0.998 kg.

Often the mass and weights are confused with each other. The weight is proportional with the gravitation. On earth is the gravity is not equal everywhere, so the weight is not equal everywhere, but the mass is. If you weigh a mass on the moon, it will be 6 times lighter than on earth, because there is the gravity six times smaller. You can measure the mass in kilograms with a mass balance and the weight with a weigh-beam in Newton. You can calculate the weight with:

F is the weight in N
m = mass in kilogram
g = gravity in m/s2

The mass has a strange unit, because in the unit is a prefix. This is due to the history of the SI. The unit supposed to be equal to one liter of water. This would be called a grave. The volume unit liter is derived from the unit of length. The French thought that the unit was too big and thought that it could give problems with trading and daily use. That is why they have rejected the grave and introduced a new unit. This unit is equal to one milliliter of water. That is 1/1000 of the liter. This new unit got the name gram. This did not seem to be so practical at all and that is why they wanted go back to the grave, but with a new name. The gram was exactly one thousandth of a grave, so the new unit was kilogram, in other words: 1000 gram. That is why there is a prefix in the SI. Later the definition was rejected, because is was not so exact. Nowadays the kilogram is a block of platinum-iridium that is kept in Sèvres, France. This is not in line with the conditions. It is an instable unit, because is isn't based on a nature constant. There is a risk that the value of the kilogram could change. That is why scientists are holding up with the precise definition, but that is very difficult, because it is too difficult to refer on a nature constant.

How do you calculate mass from weight?

Mass does not change with location. To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons. In the formula for determining mass based on weight, mass is measured in Newtons.

What is my mass if I weigh 120 pounds?

The pound is a unit of weight. If your weight on Earth is 120 pounds — and if we're going to stick with Imperial units — then your mass is 3.7 slugs.

What is the formula of the Mass?

The formula mass is calculated by adding up all the atomic masses for every atom in the formula. Note: The atomic mass of an atom is the atom's mass relative to 1/12th of the mass of a carbon-12 atom on which the standard atomic mass scale is based (e.g. H = 1, C = 12, P = 31 etc).

What is the weight of a 75 kg mass?

On the surface of Earth, a person with a mass of 75kg will have a weight of around 735 N. On the moon, the same person would have a weight of around 120 N. Or around 1/6 of his weight on Earth.

If a person has a mass of 80kg, then they will weigh 80kg x 9.8m/s^2 or 784 Newtons on the Earth.