The electronic and magnetic structures of Pd_1-yNi_y alloys were calculated using the charge and spin self-consistent Korringa-Kohn-Rostoker method combined with the coherent potential approximation (KKR-CPA). The total and atomic magnetic moments were estimated versus y, the nickel concentration. For 0.0 1 ≤ y ≤ 0.1 and 0.5 ≤ y ≤ 0.99, the magnetic moment of Ni does not vary, being respectively 0.44 and 0.69 μ_B/f.u., and for intermediate compositions it increases linearly with y. For several Ni contents, the total and atomic magnetic moments were calculated versus x for Pd_1-yNi_yH_x and then compared with other theoretical and experimental data.