The Yale-Brown Obsessive Compulsive Scale (Y-BOCS) is scored by rating 10 items on a 0 to 4 scale, then adding them up for a total between 0 and 40. The first five items measure obsessions, the second five measure compulsions, and higher scores indicate more severe OCD. Here’s how each piece works.
The 10 Core Items
The Y-BOCS is split into two subscales of five items each. The obsession subscale (items 1 through 5) and the compulsion subscale (items 6 through 10) mirror each other in structure. Each subscale covers the same five dimensions:
- Time occupied: How much of the day obsessions or compulsions take up
- Interference: How much they disrupt work, social life, or daily activities
- Distress: How much anxiety or discomfort they cause
- Resistance: How much effort the person puts into fighting the thoughts or behaviors
- Control: How successful the person is at controlling them
Each item is rated from 0 (no symptoms) to 4 (extreme). A score of 0 on the time-occupied item, for example, means no time is spent on obsessions, while a 4 means obsessive thoughts are nearly constant. For the control items, a 0 means complete control and a 4 means the person has virtually no ability to manage the symptom.
Calculating the Total Score
Add items 1 through 5 for the obsession subscale score (range: 0 to 20). Add items 6 through 10 for the compulsion subscale score (range: 0 to 20). Then add both subscales together for the total Y-BOCS score, which ranges from 0 to 40.
The two subscale scores are useful on their own. Some people have predominantly obsessional OCD with few compulsions, or vice versa, and the subscale breakdown captures that imbalance. For overall severity classification, though, the total score is what matters.
Ratings should reflect the average symptom experience over the prior week, up to and including the time of the interview. The goal is to capture a representative picture of the full week, not just the person’s worst or best day.
Severity Ranges
A study in Comprehensive Psychiatry mapped Y-BOCS totals to clinician-rated global severity and established these thresholds:
- 0 to 13: Mild or less. Little to no functional impairment.
- 14 to 25: Moderate. The person can function but with noticeable effort.
- 26 to 34: Moderate to severe. Functioning is limited.
- 35 to 40: Severe. The person needs assistance to function or is essentially unable to.
These cutoffs are widely used in clinical trials and treatment planning. Someone scoring in the moderate range is typically a good candidate for standard treatment, while scores above 26 often indicate the need for more intensive intervention.
Tracking Treatment Response
The Y-BOCS is designed to be administered repeatedly to measure change over time. Three benchmarks are commonly used to interpret progress:
Treatment response is defined as a reduction of 35% or more from the pre-treatment total score. So if someone starts at 28 and drops to 18 (a 36% reduction), that qualifies as a meaningful response. Some researchers use a more conservative 25% threshold, but 35% is the cutoff most reliably linked to clinician-rated improvement.
Symptom remission corresponds to a post-treatment score of 14 or below. At this level, remaining symptoms are mild enough that they cause little functional impairment.
Wellness, a higher bar that combines minimal OCD severity with good quality of life and social functioning, is best predicted by a post-treatment score of 12 or below.
Scoring the Resistance Items
The resistance items (items 4 and 9) are sometimes tricky. They measure how hard the person tries to push back against obsessions or compulsions, not how successful they are. Someone who has given up resisting entirely scores a 4 on resistance, even if their symptoms are otherwise moderate. This is an important distinction: a person with severe OCD who actively fights their symptoms might score lower on resistance than someone with milder OCD who has stopped trying.
This nuance matters because resistance scores don’t always track neatly with overall severity. Two people with the same total score can have very different resistance profiles, and clinicians use that information to guide treatment focus.
Self-Report vs. Clinician-Administered Versions
A self-report version of the Y-BOCS exists and uses the same 10 items and 0 to 4 scoring. Research shows moderate agreement between the two formats, but with some important gaps. The resistance items in particular show low consistency between self-report and clinician ratings. People tend to rate their own resistance differently than a trained interviewer would. The clinician-administered version also tends to generate higher compulsion severity ratings than the self-report. For these reasons, the clinician-administered version remains the gold standard in research and clinical settings.
Differences in the Y-BOCS-II
An updated version, the Y-BOCS-II, expanded each item from a 5-point scale (0 to 4) to a 6-point scale (0 to 5). This raises the maximum total score from 40 to 50 and gives more room to distinguish between patients at the severe end of the spectrum.
The Y-BOCS-II also replaced the obsession resistance item (item 4) with an “obsession-free interval” item, which measures how much uninterrupted time a person gets without intrusive thoughts. This change was made because obsession-free intervals often improve before overall time occupied by obsessions does, making the new item more sensitive to early treatment gains.
The Y-BOCS-II also split apart previously combined anchor points for the control and resistance items. Where the original scale grouped “moderate” and “some” control into a single rating, the revised version separates them. This can result in Y-BOCS-II scores that are up to 3 points higher than the original Y-BOCS for the same patient, so scores from the two versions are not directly interchangeable. If you’re tracking someone over time, use the same version at every assessment.