When converting, you need to make sure you convert the units properly, which is easier when using a calculator. First, enter the diameter in feet and multiply it by pi, which is approximately 3. For example, if the diameter of a tire is two feet, then the circumference is 6. Multiply this by the rotational speed. Divide this number by 5,, which converts feet per hour to miles per hour. Push the equal sign to see the speed in mph. In this example, when you push the equals sign, your calculator displays 7.
Mark Kennan is a writer based in the Kansas City area, specializing in personal finance and business topics. Multiply this number by 60 to convert it from feet per minute to feet per hour. In the following section, we will see how we can use our RPM calculator to quickly and easily convert RPM to mph and vice versa.
In a nutshell, with this RPM calculator, you can compute any one of the RPM , vehicle speed , transmission ratio , or tire diameter by providing the other three! For example, let's say you are driving a car at 60 mph , you're in 3 rd gear, and your tachometer indicates 3, rpm. Notice that this is a ratio between two rotational speeds; thus, it does not have a unit.
Now let's say that you wish to get a new set of sportier wheels for your car. That is normal because the new wheels are bigger than the old ones, so the engine and the wheels do not need to turn as fast to produce the same vehicle speed of 60 mph!
The term RPM stands for revolutions per minute. It is defined as the number of revolutions completed by a rotating object. Embed Share via. Table of contents: What is RPM? How to calculate RPM? How to use the RPM calculator? What is RPM? First, you can look up a tire size chart or, more conveniently, use our tire size calculator to get your tire diameter.
No problem! How do you calculate revolutions per minute? To calculate revolutions per minute: Multiply wheels RPM with transmission ratio. How do I convert vehicle speed into wheel's RPM? Divide the resultant by What are the units for RPM? RPM is measured in min Salam Moubarak , PhD. Engine RPM. Drivetrain transmission ratio. Wheel RPM. Tire diameter.
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