Critical micelle concentrations (cmc) have been calculated from conductivity measurements at 293.15, 298.15, 303.15, 308.15, and 313.15 K for sodium n-decyl sulfate (SDES), sodium n-undecyl sulfate (SUNDS), and sodium n-dodecyl sulfate (SDS) in a medium of pH 10.0 and ionic strength 0.0312. Thermodynamic parameters of micellization, standard Gibbs energies (Delta G(m)degrees), standard enthalpies (Delta H(m)degrees), and standard entropies (Delta S(m)degrees), have been obtained by application of the model of Evans and Ninham in terms of hydrophobic and surface contributions.