Planted Tank Enthusiast
Join Date: Apr 2004
Location: Des Moines, Iowa
It would hard to make an exact conversion of any substance from teaspoons to grams due to variables in density, i.e. a teaspoon of lead obviously is going to weigh more than a teaspoon of flour.
However, for the dry chemicals I use, the general rule of thumb is 1 teaspoon equals approximately 5 grams, I would think that's close enough for your purposes.