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I'd like to know how to identify the charge and the mass in a mass spectrum. How do I get the mass corresponding to a peak. I know how they are related

p=\frac{m}{z}

p_1=\frac{M_r+z_1}{z_1}

p_2=\frac{M_r+(z_1-1)}{(z_1-1)}

z_1 =\frac{p_2-1}{p_2-p_1}

M_r = \frac{1}{\frac{1}{p_1-1}-\frac{1}{p_2-1}}

but do I need a reference mass for a mass-to-tof calibration or?