Engine RPM - Speed Calculator
Calculate the vehicle's speed from engine RPM and gear ratio.
rpm
m
Result
100,2857 km/s
Speed: 100,2857 km/h
Result in all units
Step-by-step solution
What Is the RPM-Speed Relationship?
The RPM-speed calculation relates the vehicle's speed to engine RPM, gear ratio and tire circumference. It shows how the choice of gear and tire affects speed.
How is it calculated?
How Is It Calculated?
Speed depends on engine RPM and tire circumference; the gear and differential ratios reduce engine RPM to wheel RPM.
- Enter the engine RPM, gear and differential ratio, and tire circumference.
- Wheel RPM is multiplied by the tire circumference and converted to speed.
Frequently Asked Questions
How does a larger tire affect speed?
A tire with a larger circumference covers more distance at the same RPM; the speedometer may deviate from the actual speed.