Y-BOCS Calculator — Yale-Brown Obsessive Compulsive Scale
The Y-BOCS (Yale-Brown Obsessive Compulsive Scale) is the gold-standard tool for measuring OCD severity. This calculator scores 10 items across two subscales — obsessions (5 items) and compulsions (5 items) — on a 0–4 scale each, for a total score of 0–40. Scores guide clinicians and patients in assessing symptom burden and treatment response.
Understanding the Yale-Brown Obsessive Compulsive Scale
Developed by Goodman et al. in 1989 at Yale and Brown Universities, the Y-BOCS was designed to measure OCD severity independently of the specific content of obsessions or compulsions. This was a major advance over earlier scales that confused severity with symptom type. The scale has two main subscales: the Obsession Subscale (5 items rated 0–4 each, max 20) and the Compulsion Subscale (5 items rated 0–4 each, max 20). Total scores range from 0 to 40.
Each subscale evaluates five dimensions: time occupied by symptoms, degree of interference with daily functioning, subjective distress, resistance to symptoms, and degree of control over symptoms. The multidimensional structure makes Y-BOCS particularly useful for tracking which aspects of OCD are improving with treatment.
Disclaimer: This calculator is for educational and clinical reference use only. It is not a diagnostic tool. If you are experiencing significant obsessions or compulsions that interfere with daily life, please consult a mental health professional.
Y-BOCS Scoring and Clinical Interpretation
Interpreting your Y-BOCS score requires understanding both the total score and the subscale profiles. A patient with a total of 20 but with 16 on the obsession subscale and 4 on compulsions has a very different clinical presentation than a patient with a balanced 10+10 profile — even though both score 20 overall. Subscale asymmetry can guide treatment selection: predominantly obsessional OCD (Pure-O) often responds differently to ERP (Exposure and Response Prevention) compared to predominantly compulsive presentations.
In randomized controlled trials of OCD treatments (SSRIs, clomipramine, ERP therapy), a reduction of 35% or more in Y-BOCS score from baseline is the standard definition of treatment response. Remission is typically defined as a Y-BOCS total score below 8.
OCD Treatment and Y-BOCS Monitoring
Effective OCD treatments that produce measurable Y-BOCS reductions include ERP (Exposure and Response Prevention) — the first-line psychological treatment, typically delivered over 12–20 weekly sessions; SSRIs (fluoxetine, fluvoxamine, sertraline, paroxetine, escitalopram) at higher doses than used for depression; and clomipramine (a TCA with demonstrated efficacy comparable to SSRIs but a higher side-effect burden). For treatment-resistant OCD, augmentation strategies include low-dose antipsychotics, deep brain stimulation, and transcranial magnetic stimulation (TMS). Y-BOCS monitoring every 4–8 weeks helps track response and inform dose adjustments.
Frequently Asked Questions
What is the Y-BOCS calculator?
The Y-BOCS calculator computes your Yale-Brown Obsessive Compulsive Scale score, the most widely used clinical measure of OCD severity. It rates 10 items on a 0–4 scale: 5 items for obsessions and 5 for compulsions. Total scores range from 0 to 40.
What do Y-BOCS scores mean?
Y-BOCS score interpretation: 0–7 = subclinical (minimal symptoms); 8–15 = mild OCD; 16–23 = moderate OCD; 24–31 = severe OCD; 32–40 = extreme OCD. In clinical trials, a 35% reduction in Y-BOCS score from baseline is considered a meaningful treatment response.
How is the Y-BOCS administered?
Originally designed as a clinician-administered scale during a structured interview, the Y-BOCS is also used in self-report format (Y-BOCS-SR). Each of the 10 items is rated from 0 (none) to 4 (extreme) based on time spent, interference with functioning, distress experienced, resistance to symptoms, and perceived control.
Is the Y-BOCS the same as the OCI-R?
No. The OCI-R (OCD Inventory Revised) is an 18-item self-report scale measuring distress from specific OCD symptom categories. The Y-BOCS measures overall severity rather than symptom types. Both are validated, but Y-BOCS is preferred for tracking treatment response in clinical settings.
Can this Y-BOCS score diagnose OCD?
No. The Y-BOCS measures the severity of symptoms in people who already meet diagnostic criteria for OCD per DSM-5. A diagnosis of OCD must be made by a qualified mental health professional. This calculator is a clinical reference tool and does not replace professional evaluation.