For Bi 2 TeO 2 the calculations predict a larger ZT = 0.21 than the reported value of 0.13 under the experimental conditions of n = 1.1 × 10 18 cm -3 and T = 573K, which is due to a 25% larger predicted absolute Seebeck coefficient. Moreover, the calculations predict that an even higher ZT = 0.81 should be achievable at this temperature with a modest increase in the doping level to n = 10 19 cm -3 . The largest ZT max = 1.05 is obtained with n = 5 × 10 19 cm -3 and T = 900 K, and we predict a ZT > 1 should be achievable over two narrow windows with n between 10 19 -10 20 cm -3 and T from 700-900 K. Bi 2 TeO 2 is therefore the only one of the three oxychalcogenides the calculations predict can attain a benchmark ZT > 1 with n-type doping.