Abstract The different methods of determination of black holes (BHs) masses are presented for three classes of BHs observed in the Universe: stellar mass BHs, intermediate mass BHs (IMBHs) and supermassive BHs (SBHs). The results of these determinations are briefly reviewed: stellar mass BHs are found in the range of about 3 to about 20 M_⊙, IMBHs in the range of a few hundreds to a few tens of thousands M_⊙ (the determinations are much less precise for these objects) and SBHs in the range of about 3 × 10^5 M_⊙ to about 6 × 10^{10} M_⊙.
Keywords black holes: mass determination stars: black holes intermediate mass black holes supermassive black holes
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