You can try a google conversion of ml to tsp online. The liquid ml conversion is almost equal to 2 tsp. It's 1.9? tsp per gallon and the powder, I forget the conversion, but it about equal to between 1/2 to 3/4th tsp...it doesn't have to be exact, a little more will not hurt them...it's a thiamine blocker so you won't od them if it is a tad over, by say .05 ml per gallon...I think the 2 tsp one on the liquid is 1.92 tsp per gallon but didn't want to put in print if I was off by a few.0?, if you are looking for the EXACT amount, just treat in ml. with a syringe that uses the ml and add that to the gallon of water.