Sprocket Center Distance Calculator
Input	Output
#25 = .25, #35 = .375, #40 = .5, #50 = .625, #60 = .75 Chain Pitch (inches) Drive Sprocket Teeth Driven Sprocket Teeth Links in chain	Center Distance Reduction Ratio

Chain Length Calculator
Input	Output
Chain Pitch (inches) Drive Sprocket Teeth Driven Sprocket Teeth Center Distance (inches)	Links Length (inches) Reduction Ratio