How to calculate pitching rate

Pitching rate or final cell count , C2 = number of cells/ml when diluted in final volume of wort to be fermented. To determine final cell count C2, use the dilution equation C1 X V1 = C2 X V2, where C1 is the cell count shown on  RBY yeast product label, V1 is the volume of slurry used, and  V2 is final volume of wort. Convert to  volumes to ml (10 barrels = 1,170,000 ml). Solve for C2. C2 = (C1 x V1)/V2. C2 should be between 5-10 million/ml for a 1.040 beer. Stronger beers require more yeast.