A carat is much greater.
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If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
1 kilogram = 1,000,000 milligrams, so multiply it by 1,000,000.
0.5 milligram......
"mg" is generally considered to mean "milligram" while "mcg" is usually considered to mean "microgram". If these are the meanings intended by the questioner, then 1 mg = 1000 mcg, so that the mg is definitely greater.
Milligram is a small unit of mass in metric system and the abbreviation is "mg". Gram is a metric system unit of mass. The abbreviation is "g". One Milligram is equivalant to 0.001 Gram. Therefore 540mg would equal 54g.