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. Screenshots from RPM-Decisions Click on the figures to see them larger Data input in spread sheet environment (e.g. project scores, lower and upper bounds, costs, resource constraints), hierarchical value tree presentation and elicitation of incomplete weight information using the RICH method or interval-valued weight statements