Driveshaft RPM Calculator

Inputs

View results
Vehicle road speed.
mph
Loaded or calculated tire diameter.
in
Axle or differential ratio between driveshaft and wheel.
Use 1 if the shaft speed you want is directly ahead of the axle. Include transfer or drop-box reduction only when it is between the shaft and wheels.
Estimated or manufacturer shaft speed limit for utilization comparison.
rpm

Results

Default result
Edit inputs
Driveshaft RPM
3,134rpm

Driveshaft RPM = wheel RPM * final drive * additional reduction.

Also computed

Wheel RPM840rpm

Speed at critical RPM124.4mph

Critical-speed utilization52.2%

Speed per 1000 shaft RPM20.74mph

Tire circumference81.68in

Shaft-to-wheel ratio3.73

Method notes 3 notes
  • Wheel RPM = road speed / tire circumference. Shaft RPM multiplies wheel RPM by the ratio between the shaft and the wheels.
  • For a conventional rear driveshaft ahead of the differential, use final drive ratio and leave additional reduction at 1.
  • This does not check driveshaft tube critical speed, joint angle, balance, torque, plunge, yoke strength or vibration. Use it with a separate critical-speed screen.

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