You don't.
Milligrams are a measure of mass, teaspoons are a measure of volume. The two cannot be converted directly into each other. Perhaps if you knew the density of a specific substance, you could figure out how much a teaspoon of it would contain.
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There are 1000 micrograms in a milligram. To convert, you divide by 1000. 50000/1000 is 50 milligrams.
Multiply the number of milligrams by 1000.
There are 1,000 milligrams in a gram.
One gram equals 1,000 milligrams.
2.29 grams = 2290 milligrams