dosing calculator

have anyone used or can rate this brand of doing pump Ump

HI, Recently I bought the Red Sea Reefdose 4 and I'm looking for a website or spreadsheet to calculate how much i have to dose (based on the measurement from the lasts months): 1) KH/Alkalinity 2) NO3:PO4-X 3) Calcium 4) Magnesium Thank you