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We calculate for the first time the finite size corrections in the massive Thirring model. This is done by numerically solving the equations of periodic boundary conditions of the Bethe ansatz solution. It is found that the corresponding central charge extracted from the 1/L term is around 0.4 for the coupling constant of g_0=-π 4 and decreases down to zero when g_0=-π3. This is quite different from the predicted central charge of the sine-Gordon model.doi:10.1103/physrevd.58.085011 fatcat:qvaojavecvhjzl5dxsd6v5nrha