Use our Gear Ratio RPM Calculator to precisely determine your vehicle's engine revolutions per minute (RPM) based on speed, tire size, transmission gear ratio, and axle ratio. This essential tool is perfect for automotive enthusiasts, mechanics, and anyone looking to optimize their vehicle's performance or fuel economy. Get instant, accurate results!
Formula:
RPM = (Speed (MPH) × Transmission Gear Ratio × Axle Ratio × 336) / Tire Diameter (inches)
- RPM: Engine Revolutions Per Minute
- Speed: Vehicle Speed in Miles Per Hour (MPH)
- Transmission Gear Ratio: The ratio of the specific gear in your transmission (e.g., 1st, 2nd, 3rd, OD)
- Axle Ratio: The final drive ratio (differential gear ratio)
- Tire Diameter: Overall diameter of your tire in inches
- 336: A constant for unit conversion