Vehicle gear ratio, speed and engine RPM calculator Vehicle gear ratio, speed and engine RPM calculator

Quick start

Calculate speed or engine RPM and compare your gear ratios.

  1. Choose speed or RPM calculation
  2. Enter the tire and drivetrain ratios
  3. Calculate and export the gear comparison

Vehicle gear ratio, speed and engine RPM calculator

Convert engine speed into wheel speed and vehicle speed using the selected transmission ratio, final-drive ratio and tire diameter.

Calculator settings

Geometric speed onlyThe model uses tire diameter and gear ratios without tire deformation or slip. Speed at redline is not a prediction of attainable top speed; engine power, drag and traction are not modeled.

Result

Vehicle Speed
89.7 km/h
Vehicle speed at maximum engine speed
194.2 km/h
Wheel Rpm
732 rpm
Overall Ratio
4.1 :1
Distance Per Wheel Turn
2.04 m
Engine RPM
3,000 rpm

Compare gears at the calculated engine RPM

Gear
1
Ratio
3.5
Speed
25.6 km/h
Speed at redline
55.5 km/h
Gear
2
Ratio
2.1
Speed
42.7 km/h
Speed at redline
92.5 km/h
Gear
3
Ratio
1.4
Speed
64 km/h
Speed at redline
138.7 km/h
Gear
4
Ratio
1
Speed
89.7 km/h
Speed at redline
194.2 km/h
Gear
5
Ratio
0.8
Speed
112.1 km/h
Speed at redline
242.8 km/h

Vehicle gear ratio, speed and engine RPM calculator online

Convert engine speed into wheel speed and vehicle speed using the selected transmission ratio, final-drive ratio and tire diameter.

The result is an engineering or planning estimate. Verify critical dimensions, prices, limits and safety requirements before making a final decision.

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