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Mass Unit Conversion Calculator

Type values into the field.

ounce (avoirdupois)oz
ounce (troy)oz
pound (avoirdupois)lb
ton (long UK)tn
tonne (metric ton)t
ton (short US)tn

A fundamental physical quantity; one of the seven SI base quantities from which all the derived physical quantities are formed. The SI base unit of mass is the kilogram.

Weight and mass are different physical quantities and should not be confused. Weight is a quantity of force exerted by an object due to external interaction with its surroundings like gravity. The weight of an object will vary depending on its environment; an object will weigh less on the moon and more if accelerated upwards in a lift. The mass of an object is a fundamental quantity and its value will not change with changes in environment. In static every day life on earth the value of weight and mass are very similar.