Mass Unit Conversions
Definition
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The term mass is often used interchangeably with "weight". Strictly speaking, this is incorrect because weight varies with the force of gravity and mass does not.
For example, an astronaut would be almost weightless in outer space, but his or her mass would be unchanged from that on Earth. Therefore, one can say that mass is an expression of "how much stuff" something has.
Here is a handy conversion calculator for some common and uncommon mass (weight) terms. Each term is defined in the next section.
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Mass Conversion Calculator (Enter number on the left side; answer appears on the right side)
This many:
metric tons kilograms grams carats milligrams micrograms nanograms picograms femtograms attograms zeptograms long tons short tons (tons) pounds ounces drams grains
Equals
metric tons kilograms grams carats milligrams micrograms nanograms picograms femtograms attograms zeptograms long tons short tons (tons) pounds ounces drams grains