Gear Ratio Calculator
Estimate engine RPM from speed, tire diameter and axle gearing.
Enter your vehicle speed, tire diameter, axle ratio and transmission ratio to estimate engine RPM.
Estimated Results
Engine RPM
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Overall Gear Ratio
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Tire Revs/Mile
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Wheel RPM
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Speed Used
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💡 Gearing Note
Enter your vehicle information above to estimate engine RPM.
Important:
This calculator provides a theoretical RPM estimate. Actual engine RPM can
vary because of tire growth, torque-converter slip, clutch slip and other drivetrain factors.
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