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The milligram is an SI unit of mass.

$1$ milligram is defined as $= \dfrac 1 {1 \, 000}$ of a gram.


The symbol for the milligram is $\mathrm {mg}$.

Also see

Linguistic Note

The original British English spelling of milligram was milligramme.

However, this is rarely used nowadays, as the American milligram is now the international standard.