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Conversion ratio "i," calculating

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Example: 

CALCULATION CHART OF CONVERSION RATIO "i" (EXAMPLE)

Gear 5th gear Final drive
Drive gear ZG1 = 51 ZA1 = 18
Driven gear ZG2 = 38 ZA2 = 66

i =Z2 /Z2 =Number of teeth on driven gear/Number of teeth on drive gear

iG = Gear ratio =ZG2 /ZG1 = 38/51 = 0.745

iA = Final drive ratio = ZA2 /ZA1 = 68/18 = 3.667

iOverall = Conversion ratio = iG x IA

iOverall = 0.745 x 3.667 = 2.732