Man ur sharp as a bowlin ball arent ya. Wut r u converting...........NOTHING..........as u sed, u "asked simple math". Basic elementary addition here............that's all. U stated ur compound was 250 mg/ml, u wanted 2 verify that filling the barrel of the syringe to the 2 ml mark, makes a total of 500 mg. Sounds like 1 + 1 = 2 to me..................& u had 2 start a thread 2 figure it out.