RPM to MPH Calculator for Stationary Bike

This tool converts RPM (Revolutions Per Minute) to MPH (Miles Per Hour) for a stationary bike

Enter

  • Diameter or Circumference of the Bike’s flywheel
  • RPM

The tool will provide the speed in MPH

Formula

To convert from revolutions per minute (RPM) to miles per hour (mph), you need to know the diameter d of bicycle flywheel. The circumference C of a circle is calculated by:

C = π × d

where:

  • π is approximately 3.14159,
  • d is the diameter of the circle.

The conversion from RPM to miles per hour can be done with the following formula:

Miles Per Hour = RPM × π × d × 0.03728

Here’s how it works:

  • RPM is the rotational speed you want to convert.
  • π×d gives the circumference in meters.
  • 0.03728 converts to Miles per hour

Example Calculations

Consider a bike flywheel with a diameter of 0.4 meter. If the bike is spinning at 100 RPM the linear speed is approximately 58.56 Miles per hour.

Background

Rotational Speed refers to the number of complete turns a rotating object makes per unit of time. It is commonly measured in revolutions per minute (RPM), indicating how many full rotations occur in one minute. This measurement is critical in understanding the dynamics of rotating machinery, such as engines, turbines, and wheels.

Linear Speed is the distance traveled by a point on the circumference of the rotating object along its path in a given period of time, measured in miles per hour (m/s). Converting RPM to MPH helps in understanding the relationship between the rotational motion of an object and its linear motion.

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