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We present FlexibleEFTHiggs, a method for calculating the SM-like Higgs polemass in SUSY (and even non-SUSY) models, which combines an effective fieldtheory approach with a diagrammatic calculation. It thus achieves an all orderresummation of leading logarithms together with the inclusion of allnon-logarithmic 1-loop contributions. We implement this method intoFlexibleSUSY and study its properties in the MSSM, NMSSM, E6SSM and MRSSM. Inthe MSSM, it correctly interpolates between the known results of effectivefield theory calculations in the literature for a high SUSY scale andfixed-order calculations in the full theory for a sub-TeV SUSY scale. Wecompare our MSSM results to those from public codes and identify the origin ofthe most significant deviations between the DR-bar programs. We then perform asimilar comparison in the remaining three non-minimal models. For all fourmodels we estimate the theoretical uncertainty of FlexibleEFTHiggs and thefixed-order DR-bar programs thereby finding that the former becomes moreprecise than the latter for a SUSY scale above a few TeV. Even for sub-TeV SUSYscales, FlexibleEFTHiggs maintains the uncertainty estimate around 2-3 GeV,remaining a competitive alternative to existing fixed-order computations.

Precise Higgs mass calculations in (non-)minimal supersymmetry at both high and low scales