K 2 {\displaystyle K_{2}} is the K-factor of the other rotor, and T 2 {\displaystyle T_{2}} , the time to pellet in the other rotor, can be calculated. In this manner, one does not need access to the exact rotor cited in a protocol, as long as the K-factor can be calculated. Many online calculators are available to perform the calculations for common rotors.