This won't answer your original question, but it may help you to treat your plants while you search
for the conversion.
Make up a large batch, maybe 3 - 5 gallons of the solution using one measure per one gallon of water (chill, I know, I know*) and pour the solution into a very large tray (I use the concrete mixing trays sold at Home Depot), set all you pots into the tray of solution and allow each pot to soak up as much water as it requires. There. Done.
*Since there is no such thing as a standard one gallon plant pot like there is in the world of weights and measures, that is my best answer.