`Gear Ratio = "Number of Ring Gear Teeth" / "Number of Pinion Gear Teeth"`

Enter a value for all fields

This Gear Ratio From Teeth count calculator computes the rear end gear ratio, or axle ratio, or how many times the driveshaft spins for one full rotation of the tires. 

INSTRUCTIONS: Choose units and enter the following:

• (R) Number of teeth on the main gear
• (P) Number of teeth on pinion gear

Gear Ratio: The value is returned as a ratio (ex: 3.73:1)

The Math / Science