Hey there! Boo! yes this is a real blog, first in my life! The simplest way to try this is to post the back of the new 3rdi Solutions business card which has concentration information on the back for Lugol's as well as SSKI formulations:
To summarize, if you want to know how many milligrams per drop your Lugol's solution has just multiply the percent (using USA convention) by 1.25.
The amount of iodide per metric drop (20-drops/ml) dissolved in a saturated solution of potassium iodide is given in the table at temperatures Farhenhiet from 33 to 212.
If you have any questions, feel free to ask.