Percentage residuals of cluster counts (left panel) and cluster clustering covariance matrices (central and right panels), computed with the bias from Tinker et al. (2010) in comparison to the one calculated using the bias calibrated in this study (Eq. (24)). We show the full covariance matrix for number counts in mass and redshift bins. For the two-point correlation function of galaxy clusters, we show two blocks of the full covariance (low and high redshift bins) as a function of the radial separation.