Demanded length of roller chain
Utilizing the center distance among the sprocket shafts and also the amount of teeth of the two sprockets, the chain length (pitch variety) is 
often obtained through the following formula:
Lp＝（N1 ＋ N2）/2＋ 2Cp＋｛（ N2－N1 ）／2π｝2
Lp : All round length of chain (Pitch amount)
N1 : Amount of teeth of small sprocket
N2 : Variety of teeth of massive sprocket
Cp: Center distance concerning two sprocket shafts (Chain pitch)
The Lp (pitch variety) obtained through the over formula hardly becomes an integer, and commonly consists of a decimal fraction. Round up the decimal to an integer. Use an offset link should the amount is odd, but select an even variety around probable.
When Lp is determined, re-calculate the center distance concerning the driving shaft and driven shaft as described during the following paragraph. In case the sprocket center distance are not able to be altered, tighten the chain using an idler or chain tightener .
Center distance in between driving and driven shafts
Naturally, the center distance between the driving and driven shafts has to be more compared to the sum of your radius of both sprockets, but usually, a right sprocket center distance is viewed as to be 30 to 50 occasions the chain pitch. However, when the load is pulsating, 20 occasions or much less is good. The take-up angle concerning the tiny sprocket as well as the chain have to be 120°or more. In case the roller chain length Lp is given, the center distance amongst the sprockets can be obtained in the following formula:
Cp＝１/4Lp－(N1＋N2)/2+√(Lp－(N1＋N2)/2)^2－2/π2（N2－N1）^2
Cp : Sprocket center distance (pitch variety)
Lp : All round length of chain (pitch number)
N1 : Number of teeth of small sprocket
N2 : Number of teeth of big sprocket
