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Dimensional models of personality disorders (PD) in the DSM-5 and ICD-11 share a focus on impairments in self and interpersonal functioning to represent the general features and severity of PD. This new perspective has led to the development of numerous measures for assessing individual differences in PD severity. While this improves choices for researchers and practitioners, it also poses the challenge of an increasing lack of standardization. The aim of this study is to establish a common metric across 6 widely used self-report measures of PD severity using item response theory models. 849 participants completed a survey including the Inventory of Personality Organization–16-item version (IPO-16), the Level of Personality Functioning Scale–Brief Form 2.0, the Level of Personality Functioning Scale–Self-Report, the Operationalized Psychodynamic Diagnosis–Structure …