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How to convert Milligrams to Atomic Mass Unit (mg to u)? 1 mg = 6.0221366553018E+20 u. 1 x 6.0221366553018E+20 u = 6.0221366553018E+20 Atomic Mass Unit. Always check the results; rounding errors may occur.
Definition: In relation to the base unit of [mass weight] => (kilograms), 1 Milligrams (mg) is equal to 1.0E-6 kilograms, while 1 Atomic Mass Unit (u) = 1.660540199E-27 kilograms.