How many mg are in a teaspoon?

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Answer

Teaspoons measure volume and mg measure weight, so there is no universal conversion factor - the conversion factor depends on what substance you are measuring. There are 4.9 ml in a US teaspoon, so you need to figure out the density of the substance and work from there.

If you are trying to measure a dose of something in solution, you need to know the concentration of the solution. The concentration should be listed on the bottle, probably in mg / ml (if not, convert). Multiply mg / ml by 4.9 to get mg / teaspoon.

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