Measure your engine’s RPM based on the ring gear and pinion gear ratio, speed, and tire height.
In order to calculate the engine RPM based on ring gear and pinion gear ratio, speed and tire height, this calculator makes the following assumptions:
- You may not be sure of the type of transmission you are currently using. The results will then be:
- Automatic transmission in drive
- Automatic transmission in overdrive
- 3 speed (manual transmission) in last (3rd) gear
- 5 speed or higher manual transmission in last gear
- The ratios used for the transmissions are 0.70 for the automatic and 0.80 for the manual
- You know the ring gear and pinion gear ratio; see the Gear Ratio Calculator to determine your ratio
- You know the tire height in inches; see the Tire Height Calculator to determine your tire height
- The speed will be the vehicle speed, measured in miles per hour (MPH)
How to use this calculator:
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