  We show how LHC Higgs boson production and decay data can be used to extract
gauge and fermion couplings of Higgs bosons. We show that very mild theoretical
assumptions, which are valid in general multi-Higgs doublet models, are
sufficient to allow the extraction of absolute values for the couplings rather
than just ratios of the couplings. For Higgs masses below 200 GeV we find
accuracies of 10-40% for the Higgs boson couplings and total width after
several years of LHC running. Slightly stronger assumptions on the Higgs gauge
couplings even lead to a determination of couplings to fermions at the level of
10-20%. We also study the sensitivity to deviations from SM predictions in
several supersymmetric benchmark scenarios as a subset of the analysis.
