Converting revolutions per minute to a speed of miles per hour.
Like you need to know this we will make this calculation about a skill saw.
If you look at the specs of your skill saw, among other things, it will state the no-load speed given in revolutions per minute the saw can operate at. This is the speed your saw blade will run at when you pull the trigger and of course the instance you cut into a material the RPM's will be reduced.To be able to calculate the speed in miles per hour in addition to the RPM's, you need to know the diameter of the saw blade and convert this to its circumference.
Formula : circumference = 2 * radius * pi or circumference = diameter * pi. pi = 3.14159...........7 1/4" saw blade
The speed at which this saw blade runs is 127.255 miles per hour.