A combined measurement of differential and inclusive total cross sections of Higgs boson production is performed using 36.1 fb^(-1) of 13 TeV proton-proton collision data produced by the LHC and recorded by the ATLAS detector in 2015 and 2016. Cross sections are obtained from measured H -> gamma-gamma and H -> ZZ* -> 4-leptons event yields, which are combined taking into account detector efficiencies, resolution, acceptances and branching fractions.