Measurement of patient-to-staff violence (PSV) is essential for the institution to prevent negative outcomes and provide effective interventions. Although there are several approaches to doing this in psychiatry, little is known about how well they adapt to different types of wards. The role of gender and age also needs further investigation. The present study aimed to examine and compare characteristics that contribute to the objective and subjective measurement of the severity of PSV in adult (AP) and geriatric (PG) psychiatric wards. Results show that 70% of the reported violence over 30 months (N = 589) was PSV, mostly perpetrated by male patients against nurses. Objective severity ratings were higher in PG than in AP wards, and conversely, subjective ratings were higher in AP than in PG wards. The findings support the systematic measurement of PSV in psychiatric wards and highlight the need for targeted interventions to address the risks associated with minimizing violence.