Gear Ratio Calculator

Enter the number of teeth found on your ring gear as well as your pinion gear in the boxes below to calculate their combined ring and pinion gear ratio.

Ring Gear Teeth:
Pinion Gear Teeth:
Gear Ratio:

(Confirm your answer with the standard gear ratios listed below.)

NEW! - Need help with this calculator? Check out the new comments section below!

Axle Parts

Gear Ratio Calculation Basics

Your axle gear ratio determines how many times your driveshaft rotates for every full tire rotation. For example, a 3.73 gear ratio requires 3.73 driveshaft rotations to turn your tires once around. You should be able to find your gear ratio listed on the axle tag, however, if that has gone missing, you can simply count the number of teeth on each gear and divide the number of ring gear teeth by the number of pinion gear teeth.

[ Ring Gear Teeth / Pinion Gear Teeth ] = [ 41 / 11 ] = [ 3.73 ]

Popular OEM and Aftermarket Gear Ratios

The following table contains a list of common aftermarket gear ratios. Keep in mind that in some applications the gear ratios might not calculate exactly, as is the case with 4.09, 4.10, and 4.11 gears and 4.30 and 4.31 gears.

2.47 3.54-3.56 4.50 5.50
2.84 3.60 4.56 5.57
2.91 3.64 4.63 5.67
3.00 3.70 4.71 5.75
3.07 3.75 4.78 5.83
3.08 3.82 4.86 6.00
3.10 3.89 5.00 6.14
3.15 4.00 5.11 6.20
3.25 4.09-4.11 5.13 6.33
3.33 4.30 5.25 6.43
3.40 4.33 5.29 6.50
3.45 4.40 5.33 6.86
3.50 4.44 5.43

For a complete list of gears available for your vehicle, visit the Filthy Motorsports Drivetrain Shop.

Helpful Gear Changing Tips

Other Ring and Pinion Gear Resources

Differential Locker Comparison
Gear Ratio Finder
Ring and Pinion Setup Specs
Thick Gears and Carrier Breaks
3.55 and 4.10 Gears Variations

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