Psychiatry Calculators
55 calculators & risk scores
Browse 55 Psychiatry clinical calculators and risk scores used in everyday UK practice. Every tool runs entirely in your browser — enter the values and get instant scoring, colour-coded interpretation bands and a link to the underlying guideline or publication. ClinCalc Pro is free, needs no sign-up, and is built for working clinicians.
These psychiatry tools span Diagnosis, Prognosis, Suicide Risk Assessment, Substance Misuse Risk, Depression Assessment, Bipolar Screening and more.
- PHQ-9 Depression ScalePatient Health Questionnaire-9 for screening and monitoring depression severity.
- PHQ-2 Depression ScreenTwo-item ultra-brief screening tool for depression. Score ≥3 warrants full PHQ-9.
- GAD-7 Anxiety ScaleGeneralised Anxiety Disorder 7-item scale for screening and severity assessment.
- AUDIT — Alcohol Use Disorders Identification TestWHO 10-item questionnaire to identify hazardous/harmful alcohol use and alcohol dependence.
- AUDIT-C — Alcohol ScreenAbbreviated 3-item version of AUDIT. Score ≥3 (women) or ≥4 (men) is positive.
- CAGE QuestionnaireFour-question screening tool for alcohol misuse. Score ≥2 is clinically significant.
- CIWA-Ar — Alcohol Withdrawal ScaleClinical Institute Withdrawal Assessment for Alcohol — Revised. Guides benzodiazepine dosing in alcohol withdrawal.
- COWS — Opioid Withdrawal ScaleClinical Opiate Withdrawal Scale. Guides buprenorphine induction timing and severity monitoring.
- MADRS — Montgomery-Åsberg Depression Scale10-item clinician-rated scale for measuring severity of depression episodes. Commonly used in clinical trials.
- Epworth Sleepiness ScaleSelf-administered 8-item questionnaire measuring daytime somnolence. Used to screen for sleep disorders including OSA.
- Geriatric Depression Scale-1515-item yes/no scale validated for depression screening in the elderly.
- DAST-10 — Drug Abuse Screening Test10-item yes/no questionnaire assessing drug misuse (excluding alcohol and tobacco) in the past 12 months.
- SAD PERSONS Scale10-item mnemonic scale for assessing suicide risk. Each positive factor scores 1 point.
- Young Mania Rating ScaleClinician-rated 11-item scale measuring severity of manic episodes. Widely used in bipolar disorder trials.
- Columbia Suicide Severity Rating Scale (C-SSRS)Standardised tool for assessing suicidal ideation and behaviour. Used in emergency, inpatient, and outpatient settings. Recommended by FDA for clinical trials and widely adopted globally.
- Opioid Risk Tool (ORT)Predicts risk of aberrant drug-related behaviour in patients prescribed opioids for chronic pain. Scored separately for male and female patients.
- Hamilton Depression Rating Scale (HAM-D17)Clinician-administered 17-item scale measuring depression severity. Standard outcome measure in antidepressant trials and clinical practice.
- Mood Disorder Questionnaire (MDQ)Self-report screening tool for bipolar spectrum disorders. Positive screen requires ≥7 of 13 symptoms, symptom clustering, and moderate/serious functional impairment.
- PCL-5 — PTSD Checklist for DSM-520-item self-report measure of DSM-5 PTSD symptom severity. Score 0–80. Provisional PTSD diagnosis threshold: score ≥33.
- PANSS Brief — Positive and Negative Syndrome Scale (Abbreviated)Abbreviated PANSS assessing positive, negative, and general psychopathology domains in schizophrenia and related disorders. Full PANSS is 30-item; this abbreviated version covers key domains.
- MAST — Michigan Alcohol Screening Test25-item structured interview for detecting lifetime alcohol use disorder. Score ≥5 indicates possible alcohol problem.
- Montreal Cognitive — Short Screening for Substance MisuseCRAFFT screening tool for alcohol and substance misuse in adolescents (12–21 years). CRAFFT = Car, Relax, Alone, Forget, Friends, Trouble.
- Geriatric Depression Scale (GDS-15)15-item self-report screening tool for depression in older adults (>65 years). Avoids somatic items that confound depression screening in the elderly. Short form of original 30-item GDS.
- Brief Alcohol Withdrawal Scale (BAWS)Brief validated tool for assessing alcohol withdrawal severity in clinical settings. Assesses 8 domains. Score ≥5 suggests significant withdrawal requiring pharmacological management.
- Glasgow Modified Alcohol Withdrawal Scale (GMAWS)Validated 5-item scale for monitoring alcohol withdrawal severity. Developed at Glasgow Royal Infirmary. Simpler than CIWA-Ar and validated in UK acute settings. Score ≥2 = consider benzodiazepines.
- Prediction of Alcohol Withdrawal Severity Scale (PAWSS)10-item tool to predict risk of complicated alcohol withdrawal (seizures, delirium tremens) before symptoms develop. Score ≥4 = high risk requiring prophylactic benzodiazepines.
- Subjective Opiate Withdrawal Scale (SOWS)16-item self-rated scale measuring severity of opiate withdrawal symptoms. Score 0–64. Complements objective COWS scale. Used to monitor withdrawal in opioid detoxification.
- Brief Addiction Monitor (BAM)17-item instrument for monitoring patients in addiction treatment. Assesses substance use, protective factors, and risk factors for relapse. Designed for routine use at each treatment visit.
- Hamilton Anxiety Rating Scale (HAM-A)14-item clinician-administered scale measuring anxiety severity. Each item rated 0–4. Total score 0–56. Widely used in clinical trials and clinical practice for anxiety disorders.
- Major Depression Index (MDI)10-item self-report depression scale derived from ICD-10 and DSM-IV criteria. Can be used as a severity measure (score 0–50) or for diagnosis of depression. Validated in primary care and general practice.
- Quick Inventory of Depressive Symptomatology (QIDS)16-item (QIDS-C clinician-rated; QIDS-SR self-report) measure of depression severity based on 9 DSM-IV symptom domains. Score 0–27. Used in clinical trials and STAR*D study.
- Primary Care PTSD Screen for DSM-5 (PC-PTSD-5)5-item screen for PTSD in primary care settings. A positive screen (≥3) warrants further evaluation. Validated against structured clinical interview (SCID). Requires a traumatic event as a precondition.
- Edinburgh Postnatal Depression Scale (EPDS)10-item self-report scale for screening perinatal depression in pregnancy and up to 1 year postpartum. Score ≥13 = probable depression. Score ≥10 = risk of depression. Item 10 (suicidal ideation) always reviewed regardless of total score.
- Abnormal Involuntary Movement Scale (AIMS)Clinician-rated 12-item scale for assessing tardive dyskinesia and other abnormal involuntary movements in patients on antipsychotic medications. Items 1–7 are scored 0–4; items 8–12 are additional assessments.
- Brief Psychiatric Rating Scale (BPRS)18-item clinician-administered scale assessing psychiatric symptoms in patients with major mental illness, particularly schizophrenia. Each item 1–7. Total 18–126. Widely used in clinical trials and acute settings.
- Montreal Cognitive Assessment (MoCA)30-point cognitive screening instrument for mild cognitive impairment (MCI) and dementia. Assesses visuospatial, naming, memory, attention, language, abstraction, and orientation. Score <26 = cognitive impairment. +1 point if ≤12 years education.
- Stanford Sleepiness Scale (SSS)7-point self-report scale measuring subjective level of sleepiness at a given moment. Developed at Stanford. Used in sleep research and clinical assessment. Score 1 = feeling active/alert; score 7 = fighting sleep.
- Adult ADHD Self-Report Scale (ASRS v1.1)18-item self-report screening tool for adult ADHD developed with WHO. Part A (items 1–6) is the validated screener — a positive screen requires ≥4 items shaded in the dark zone. Full 18-item scale assesses full symptom picture.
- PHQ-15 for Somatic Symptom Severity15-item somatic symptom severity scale derived from the full PHQ. Score 0–30. Assesses frequency of physical complaints with no medical explanation. Score ≥10 = high somatic symptom severity.
- CRAFFT Substance Use Screening Tool6-item screening tool for problematic substance use in adolescents (12–21 years). CRAFFT is an acronym: Car, Relax, Alone, Forget, Friends, Trouble. Score ≥2 = positive screen for problem use.
- SCOFF Questionnaire for Eating Disorders5-item screening questionnaire for anorexia nervosa and bulimia nervosa. Validated in primary care. Score ≥2 = likely eating disorder. SCOFF = Sick, Control, One stone, Fat, Food.
- Revised Opioid Risk Tool (ORT-OUD)Revised version of the Opioid Risk Tool specifically predicting opioid use disorder (OUD) risk in patients prescribed opioids for chronic pain. 5 items, score 0–26. Score ≥8 = high risk.
- Short Michigan Alcoholism Screening Test (SMAST)13-item brief version of the MAST for alcohol use disorder screening. Score ≥3 = probable alcoholism. Score 1–2 = possible; score 0 = unlikely. Validated in multiple settings.
- Behavioral Activity Rating Scale (BARS)7-point single-item scale for rapidly assessing sedation and agitation in clinical settings. Used to guide pharmacological management of acute agitation. Score 1 = difficult to arouse; score 4 = calm; score 7 = violently agitated.
- Short Michigan Alcoholism Screening Test — Geriatric Version (SMAST-G)10-item version of the SMAST adapted for older adults (≥65 years). Addresses age-specific alcohol use issues (drinking to cope, loneliness, pain). Score ≥2 = probable alcohol use problem.
- DSM-5 Criteria for Major Depressive DisorderDSM-5 diagnostic criteria checklist for Major Depressive Disorder (MDD). Requires ≥5 symptoms for ≥2 weeks, with at least one being depressed mood or anhedonia, causing significant distress or functional impairment.
- DSM-5 Criteria for Bipolar DisorderDSM-5 diagnostic criteria checklist for Bipolar I (manic episode required) and Bipolar II (hypomanic + depressive episode required) disorders. Distinguishing features of mania vs hypomania are duration and impairment.
- SAD PERSONS Scale (Suicide Risk)Screens for suicide risk using 10 clinical factors. Mnemonic: Sex, Age, Depression, Previous attempts, Ethanol/drug use, Rational thinking loss, Social support lacking, Organised plan, No spouse/partner, Sickness.
- PICU Admission Criteria (Psychiatric Intensive Care)Guides admission to Psychiatric Intensive Care Unit (PICU) based on risk level and behavioural criteria per NAPICU standards.
- Y-BOCS — Yale-Brown Obsessive Compulsive Scale10-item clinician-rated severity scale for OCD (Goodman 1989). 5 obsession items + 5 compulsion items, each 0–4. Total 0–40.
- Calgary Depression Scale for Schizophrenia (CDSS)9-item clinician-rated scale designed to disentangle depressive symptoms from negative or extrapyramidal symptoms in schizophrenia (Addington 1993). Each item 0–3. Total 0–27. Cut-off ≥6 for clinically significant depression.
- IES-R — Impact of Event Scale-Revised22-item self-report of subjective trauma response in past 7 days (Weiss 1997). Three subscales: intrusion, avoidance, hyperarousal. Each 0–4. Total 0–88.
- ASRS-v1.1 — Adult ADHD Self-Report ScaleWHO 6-item screener (Part A) for adult ADHD (Kessler 2005). Each item rated 0–4 (never to very often). Items 1–3 score 2+ and items 4–6 score 3+ are clinically significant ('darkened-box scoring'). This calc returns simple sum 0–24 — ≥4 darkened-box items strongly suggests ADHD.
- Vanderbilt ADHD Diagnostic Parent Rating Scale (VADPRS)47-item parent rating scale for ADHD in children 6–12 yr (Wolraich 2003). Includes 9 inattention + 9 hyperactivity items (DSM-5 Criteria A) plus oppositional, conduct, anxiety/depression screens, and 8 performance items. Picks the diagnostic category band.
- Sheehan Disability Scale (SDS)Self-report disability scale across work/school, social and family/home domains (Sheehan 1996). Each domain 0–10 visual analogue. Total 0–30.