RPM Calculator
Estimate engine RPM from speed and gearing, or reverse-calculate speed from RPM.
Inputs
Results
Run a calculation to view results.
Example Values
- 65 mph, 41in tire, 3.55 axle, 1:1 trans
Formula and Notes
RPM = (mph x axle ratio x transmission ratio x 336) / tire diameter (in)
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Diesel Toolkit provides estimated calculations only and does not replace OEM service information, engineering specs, or manufacturer procedures.