ATLAS+CMS ultimate precisions on H(125)

A summary of recent projections is presented for ATLAS and CMS measurements on Standard Model Higgs boson signal strengths, couplings, CP mixing, and rare decays on the timescale of Run III (300 fb-1) and the HL-LHC (3000 fb-1). Assuming Standard Model-like behaviour, limits on the expected precision, along with brief details on the underlying methodology, are shown for each measurement. Expected signal significance values are also presented for rare Higgs boson decay processes, outlining which may be discovered or observed at the HL-LHC after the collection of 3000 fb-1 of data.