RPM Gear Ratio Calculator

This tool calculates the engine RPMs at a given speed and gear. You can use the predefined vehicles on the left menu to get started, then edit the values to suit your vehicle. If you have stats on a vehicle you would like added to the quick select menu, please use the contact form on our site to e-mail the information to us.

Select Pre-Filled Vehicle Info

Manually Enter Specs

Transmission gears

Target RPM:
Low Range T-Case Ratio:
Measured Tire Diameter:
Axle Gear Ratio:
Max Engine RPMS:

High Range RPMs @ MPH / Gear Chart

Low Range RPMs @ MPH / Gear Chart

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Jeep Wrangler JK Gears