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
3,134 rpm

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

Also computed

Wheel RPM 840 rpm

Speed at critical RPM 124.4 mph

Critical-speed utilization 52.2 %

Speed per 1000 shaft RPM 20.74 mph

Tire circumference 81.68 in

Shaft-to-wheel ratio 3.73

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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