Many microcentrifuges only have settings for speed (revolutions per minute, RPM), not relative centrifugal force, but to be more accurate, certain procedures necessitate precise centrifugation conditions, which must be specified in terms of relative centrifugal force (RCF) expressed in units of gravity (times gravity or × g).
The relationship between revolutions per minute (RPM) and relative centrifugal force (RCF) is:
Where g is the relative centrifugal force, R is the radius of the rotor in centimeters, and S is the speed of the centrifuge in RPM.
In the following online tool you can calculate the centrifuge rotor speed, taking into account the different rotor types available. If you do not find your rotor here, you can enter the parameters manually.