Templates / Emotion reactivity scale (ERS-21): Scoring guide and PDF

Mental Health

Emotion reactivity scale (ERS-21): Scoring guide and PDF

Free PDF • 2 pages, print-ready • Clinician-reviewed

Monika Lazarevska Last updated November 9, 2026 Reviewed by Dr. Vanja Kitanova

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When a patient says they're "too emotional", the emotion reactivity scale (ERS) shows what that means in numbers. It's a 21-item self-report questionnaire covering how easily emotions are triggered, how strongly they land and how long they last.

Patients rate each statement from 0 (not at all like me) to 4 (completely like me). The ratings add up to a total between 0 and 84, plus Sensitivity, Arousal/Intensity and Persistence subscale scores. Our free PDF prints the options as 1 to 5, so subtract 1 from each rating before you score it. DBT and self-harm teams use the total as a baseline to repeat at each review.

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Scale

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Printable PDF, 2 pages

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2 sections

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Mental Health

Key takeaways

The emotion reactivity scale (ERS) is a 21-item self-report measure of emotional sensitivity, arousal/intensity and persistence.

Patients rate each statement from 0 (not at all like me) to 4 (completely like me). Our PDF prints the options as 1 to 5, so subtract 1 from each rating.

The total is the sum of all 21 items (0 to 84). Each subscale is the sum of its own items, using the key for your version.

The total is the best-validated score, while the subscale profile is a clinical aid for the conversation. Neither one makes a diagnosis.

Record the scale version and the date with every score, so results stay comparable from one review to the next.

The emotion reactivity scale measures three sides of reactivity

The emotion reactivity scale (ERS) measures how strongly a person reacts to emotional triggers, across three dimensions. Matthew Nock and colleagues at Harvard published the scale in 2008, testing it with 87 adolescents and young adults.

• Sensitivity: How easily emotions are triggered, even by small events.
• Arousal/Intensity: How strongly the emotion is felt, including in the body.
• Persistence: How long the reaction lasts before it settles.

Keeping the three apart changes the treatment plan. One patient is highly sensitive yet recovers within minutes. Another reacts less often but stays upset for days. Both might call themselves “very emotional”, yet they need different skills work.

The original study also found that emotion reactivity partly explained the link between psychopathology and self-injurious thoughts and behaviors. That finding is why the ERS appears so often in self-harm research and DBT-informed care.

The ERS-21 rates 21 statements on a five-point scale

The ERS-21 is the full 21-item version. Each item is a first-person statement, such as “My feelings get hurt easily”, rated on a five-point scale. The anchors are 0 = not at all like me and 4 = completely like me.

The items feed three subscales: Sensitivity, Arousal/Intensity and Persistence. The original paper names the middle one “Arousal/Intensity”, so use that label in your notes to match the published key.

Our free PDF prints the five options as 1 to 5 and leaves the anchor words off. Read 1 as “not at all like me” and 5 as “completely like me”. Then subtract 1 from each rating, so the scores line up with the published 0 to 84 range.

How to score the emotion reactivity scale in five steps

Scoring by hand takes a few minutes once you have the item key. Work through these steps with the completed form in front of you, in this order.

1. Check that every item has exactly one rating. Ask the patient about any blanks before they leave.
2. Convert each rating to the published 0 to 4 scale. On our 1 to 5 PDF, that means subtracting 1 from every answer.
3. Add up each subscale from the Nock 2008 key. Sensitivity has 10 items (2, 5, 7, 9, 12 to 16, and 18). Arousal/Intensity has 7 items (3, 4, 6, 17, 19, 20 and 21). Persistence has 4 items (1, 8, 10 and 11).
4. Add all 21 items together for the total score.
5. Check that the three subscale scores add up to the total, then record each score with the date and form version.

The ERS total is the sum of all 21 items, giving a range of 0 to 84. None of the items is reverse-scored, so a higher number always means more reactivity.

Because each subscale’s items are scattered across the form, the key below is the quickest way to sort ratings before you add them.

Here’s a quick worked example. Suppose a patient rates every Sensitivity item 3, every Arousal/Intensity item 2 and every Persistence item 1. That gives subscale scores of 30, 14 and 4, for a total of 48.

The total sits mid-range, and it is the number to track from one review to the next. The profile then gives you a starting point for the conversation. Sensitivity is close to its ceiling of 40 while Persistence is low, so this patient may react fast and recover fast.

Five scoring mistakes that skew ERS results

Most scoring errors come from habits carried over from other questionnaires. Watch for these five.

• Mixing response formats. Our PDF and some other printed versions number the options 1 to 5. Subtract 1 from each rating first, or the total runs 21 points too high.
• Reverse-scoring out of habit. Many questionnaires flip a few items, but the ERS has none. Flipping one lowers a score that should stay high.
• Using the wrong key. Shortened adaptations, such as a seven-item Portuguese version, use different items. Score each version with its own key.
• Guessing missing answers. A blank item drags down the subscale it belongs to. Ask the patient to complete it rather than filling in a number yourself.
• Skipping the subscale scores. Two patients with a total of 40 can have opposite profiles. Record the three subscale scores as well, since they help you shape the session.

Interpreting ERS scores: Start with the total, then read the profile

With the scores on the form, the next job is reading them. Higher scores mean stronger reactivity. The original validation paper did not set a clinical cut-off, so read scores against the patient’s history and their own earlier results.

The total is the best-validated score, because factor analyses favor a single reactivity factor. Use the subscale patterns below as a clinical aid to guide the conversation, not as three separate measures.

High reactivity was linked with self-injurious thoughts and behaviors in the original study. So treat an elevated profile as a prompt to ask about self-harm, and use a structured self-harm assessment to keep that conversation consistent across clinicians.

If a US patient is in distress or thinking about self-harm, share the 988 Suicide & Crisis Lifeline. They can call or text 988 at any time, day or night.

The ERS gives DBT and self-harm work a baseline to repeat

Emotional dysregulation is a core target in dialectical behavior therapy (DBT), so the ERS gives DBT teams a baseline before skills training starts. Repeat it at review points, alongside a DBT diary card that tracks day-to-day urges and skills use.

• DBT programs: Baseline and review scores for emotion regulation skills work.
• Borderline personality disorder: A structured picture of reactivity, alongside a full diagnostic assessment.
• Self-harm risk work: Context for a risk formulation, never a replacement for one.
• Anxiety and depression: Exploring how reactivity feeds internalizing symptoms.

The ERS pairs well with the Emotion Regulation Questionnaire. The ERS shows how strongly emotions arrive, while the ERQ shows which strategies the patient uses to manage them.

Psychologists, therapists, psychiatrists, mental health nurses and counselors can all use it. It does not diagnose borderline personality disorder or any other condition, and it should never be the only basis for a risk decision.

Psychometric evidence: The ERS is reliable, within limits

Before you lean on those numbers, it helps to know how well the scale holds up. The original study reported strong internal consistency, with a Cronbach’s alpha of .94. It also showed convergent and divergent validity against measures of behavioral inhibition, activation and temperament.

Factor analysis in that study found that a single reactivity factor fit the data best. A Dutch validation in 615 high school students (Claes and colleagues, 2014) later confirmed both a one-factor and a three-factor structure.

Because the three subscales correlate very highly (r = .87 to .94 in the Dutch study), the authors preferred a single total score. Treat subscale profiles as a descriptive aid for clinical conversation, not as independent measures.

Keep the limits in mind. The original sample was small and young, and every self-report scale depends on the patient’s insight and candor. Check which language version your patient completes, since results can differ between versions.

ERS vs Perth Emotional Reactivity Scale: Pick by what you need to measure

If a colleague suggests a different reactivity measure, it is usually this one. The Perth Emotional Reactivity Scale (PERS) is a separate instrument from Australian researchers. It splits reactivity by emotional valence, so it suits work where positive emotions matter too.

Choose the ERS for DBT and self-harm work, where its research base is strongest. Choose the PERS when you also need to see how a patient reacts to positive emotions.

Before you hand the scale to a patient: A quick checklist

A few minutes of setup keeps ERS scores comparable from one review to the next. Run through this list before each administration.

• The form is the 21-item version, with the version and date written on it.
• You’ve explained the anchors. On our PDF, 1 means “not at all like me” and 5 means “completely like me”.
• US patients know the date field on our PDF reads dd / mm / yyyy, so the date doesn’t get flipped.
• The patient completes it alone, in a quiet space, without a relative reading over their shoulder.
• Someone on the team owns the scoring, and the results have a slot in the next session.
• A risk protocol is ready in case the conversation turns to self-harm.

Many practices send the scale with their digital intake forms before the first session. The patient completes it at home, and you start the appointment with the scores already in front of you.

How Pabau scores the ERS and tracks it across sessions

Paper scoring works for a small caseload, but it gets messy across a team. Forms go missing, totals get added up twice, and earlier scores end up in a filing cabinet.

In Pabau, the practice management platform we build, you set up the ERS once as a digital form. Each answer maps to its 0 to 4 value, so nobody converts ratings by hand. With automated assessment scoring, the total is calculated the moment the patient submits and saved to their record.

Each new score lands on a trend graph next to earlier results, so progress through a DBT program is visible at a glance. Results sit in the patient’s file through patient record management, next to session notes and appointments.

The same setup handles the PHQ-9, GAD-7 and other scales in our software built for therapists. The ERS slots into an assessment routine your team already knows.

Score and track the ERS automatically

See how Pabau totals submitted questionnaires, stores each score in the patient record and charts progress across sessions.

Book a demo

Conclusion

The ERS earns its place when you score it the same way every time. Convert to the 0 to 4 scale, sum each subscale from the published key, and record the version and date with every result.

Do that, and a vague sense that a patient is “very reactive” becomes a total you can follow through treatment. The profile then helps you steer each review. The trade-off is that it stays a self-report screen. Pair it with your interview and a risk assessment whenever scores run high.

Book a demo to see how Pabau scores emotional reactivity questionnaires and keeps every result in the patient’s record.

Continue your research

Building skills after a high Sensitivity score? Opposite action worksheet helps patients act against an unhelpful emotional urge.

Working on reactions that outrun the situation? Checking the facts DBT worksheet guides patients to test whether a reaction fits the facts.

Need a grounding skill for DBT sessions? Wise mind worksheet helps patients balance emotion and reason before acting.

Want a structured regulation exercise? Emotional regulation worksheet walks patients through naming and managing strong feelings.

Measuring self-control alongside reactivity? Self-regulation questionnaire assesses how patients plan, monitor and adjust their behavior.

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