Relative centrifugal force (RCF) is the ratio between the number of rotations and the radius of the centrifuge. The values can be calculated from one another using the formula: RCF = 1.118*10-6*r*n2. r = radius of the centrifuge, n = number of rotations (= rotations/min), g = 9.81 m/s2 (= gravity), RCF = relative centrifugal force.