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The average (thermal) gyroradius of charged particles is re-examined from aquantum-mechanical point of view. The straight quantum-mechanical calculationclearly reproduces its conventionally used random-mean-square (rms) expectationvalue. The quasi-classical approach reproduces its mean expectation value aswell thus confirming the purely classical calculation. It shows that thefluctuations in the gyroradius amount to 21.5% of its rms value. Thisfluctuation is, however, within the usual $\sqrt{2}$-"freedom" range of choicein the definition of the rms gyroradius respectively the mean thermal speed onwhich the rms value is based, its correct (nonrelativistic) value $v_t^2=2T_\perp/m_e$ and its simplified version $v_t^2=T_\perp/m_e$.

QM theory of the thermal electron gyroradius