Chain Drive Ratio Calculator

Find the ratio of a chain and sprocket drive for a bicycle with this Chain Drive Ratio Calculator.

Drive Sprocket Radius :
Driven Sprocket Radius :

Fill in the radius of both sprockets to calculate the total ratio. Mechanical power travels from the Drive Sprocket to the Driven Sprocket.

How do you calculate the chain sprocket ratio?

The ratio in a drive system is represented in reference to the number 1. A ratio of 2 to 1 would be signified by 2:1. A ratio of 1/4 to one would be signified by .25:1.

To find the total ratio, use the equation: Ratio = (Radius of Driven Sprocket) / (Radius of Drive Sprocket)

Example: On a bicycle, the sprocket that is attached to the pedals is the drive sprocket and is 4 inches in radius. The driven sprocket at the rear wheel is 2 inches in radius. What is the total ratio?

Ratio = 2 / 4

Calculated out this drive has a .5:1 ratio. For every full revolution of the pedals, the rear wheel turns 2 revolutions.

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