
This study introduces the 9‑item ABC‑MHPB scale, a validated instrument for assessing mental health promoting behaviours in the general population. Grounded in the Act‑Belong‑Commit framework, the scale was evaluated in a large Danish sample (N = 119,221, aged 18–103). Confirmatory factor analysis supported a three‑factor structure with good fit, full invariance across education, and partial invariance across sex and age. Reliability, content, discriminant, and convergent validity were all satisfactory. Scale scores showed clear dose‑response associations with mental wellbeing and loneliness, supporting the instrument’s utility for population‑level monitoring and intervention evaluation. Further longitudinal and cross‑cultural validation is warranted to consolidate its predictive value.
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