RPM Calculator

RPM Calculator is an online handy tool that computes the relation between speed of a vehicle and RPM of engine. You can use this as RPM to mph Calculator too based on your requirement. Simply provide the inputs like Engine, Wheel RPM, Tire Diameter, etc. to find the other parameters like Drive Transmission Ratio, Vehicle Speed, etc. in no time.


Choose calculation:
Wheel RPM
Transmission Ratio
Engine RPM in:

Online RPM Calculator: If you face any difficulties while answering questions related to RPM then don't fret anymore as you have come the right way. The free RPM Calculator will make it easy for you to determine the Drivetrain Transmission Ratio, Vehicle Speed in no time. Along with this we have included information on What is RPM, How to Calculate RPM, How is engine RPM and Vehicle Speed related, procedure explaining how to use the RPM Calculator clearly.

What is meant by RPM?

RPM is a term that we often use when it comes to any rotating objects. RPM is nothing but the Rotations Per Minute or Revolutions Per Minute. In other words, it is the unit of Rotational Speed. In Internal Combustion Engine, Fuel and Air burn in the Cylinders and Push the Pistons. These Pistons are connected to crankshafts via rods and the mechanism transforms the piston's linear movement into rotation of crankshaft. The Crankshaft's Rotation is what we call RPM.

How to Calculate RPM?

Let us talk about what are the factors that influence the Engine's RPM and which moving Parts are related to RPM. Let us Consider the moving parts of a vehicle's powertrain which started in engine's cylinders. Once it reaches the crankshaft rotational movement continue's the car's drivetrain consisting of gears and mechanical links. The gears existing in the final drive and gear box consider this RPM as input speed and transforms it different speed at output shaft. Output Speed is the Wheel's Speed and the ratio between Wheel's Speed and RPM is nothing but the transmission ratio.

The relation between RPM and Wheels RPM is given by the equation RPM = Wheels RPM * Transmission Ratio. However, the transmission ratio can take up various values on basis of driving scenarios.

Relationship between Vehicle Speed and RPM

The equation that denotes the relationship between Vehicle Speed and RPM is given by the formula Vehicle Speed = Wheels RPM* Tire Diameter*π*60/63360. Tire diameter can be easily found in the tire size charts.

  • Where, π is the circle constant
  • 60 is the number of minutes in an hour
  • 63360 is the number of inches in a mile

How to use the RPM Calculator?

The process to use the RPM Calculator is given below for your reference. Follow the steps easily and get the results instantly.

  • Check Tire Size Chart to obtain the Tire Diameter.
  • Enter the inputs Tire Diameter, RPM and Vehicle Speed in the tool.
  • Now, hit the calculate button.
  • That's it our userfriendly tool will give you the Drivetrain Transmission Ratio in no time.

For more such similar concept tools do check out our handy portal onlinecalculator.guide and resolve all your doubts in split seconds.

FAQs on Online RPM Calculator

1. What is meant by RPM?

RPM or Revolutions Per Minute is the number of revolutions a rotating object makes in a minute.

2. How to find RPM?

RPM can be found using the formula RPM = Wheels RPM * Transmission Ratio

3. How do you calculate Vehicle Speed from RPM?

Vehicle Speed can be found using the formula Vehicle speed = Wheels RPM × Tire diameter × π × 60 / 63360.

4. How to use the Online RPM Calculator?

All you have to do is simply enter the inputs required such as Tire Diameter, RPM, and Vehicle Speed and click on the calculate button to get the drivetrain transmission ratio, and vehicle speed in seconds.