Assess your daytime sleepiness · Screen for sleep disorders
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The Epworth Sleepiness Scale (ESS) is a widely used questionnaire that measures your general level of daytime sleepiness. Developed by Dr. Murray Johns in 1991, the ESS asks you to rate your chance of dozing off in 8 common situations from sitting and reading to being stuck in traffic. Your responses provide a reliable estimate of your average daytime sleepiness, which can be an important indicator of underlying sleep disorders such as obstructive sleep apnea, narcolepsy, or insomnia.
This interactive ESS Calculator guides you through all 8 questions, each scored from 0 (no chance of dozing) to 3 (high chance). The total score ranges from 0 to 24, with higher scores indicating greater daytime sleepiness. Results are classified as Normal, Mild, Moderate, or Severe, with clear recommendations for next steps.
How to Use the Epworth Sleepiness Scale Calculator
Read each of the 8 questions about everyday situations.
For each situation, rate your chance of dozing off from 0 to 3 using the dropdown menu:
0 = No chance of dozing
1 = Slight chance of dozing
2 = Moderate chance of dozing
3 = High chance of dozing
Answer each question honestly based on your recent experience.
Use the quick example buttons to test different sleepiness profiles.
The calculator updates your ESS score automatically as you answer.
View your Total Score out of 24 in the results section.
Check your Classification (Normal, Mild, Moderate, or Severe).
Review your Risk Level and personalized Recommendation.
Read the severity classification table for clinical context.
Copy, share, or embed your results using the buttons below.
The Epworth Sleepiness Scale uses a simple additive scoring system. Each of the 8 situations is scored on a 0-3 scale, and the total score is the sum of all responses.
Formula: ESS Score = Σ(Responses to each question)
Each question offers four response options:
0 = No chance of dozing
1 = Slight chance of dozing
2 = Moderate chance of dozing
3 = High chance of dozing
Interpretation:
Normal: 0 – 10 (normal daytime sleepiness)
Mild: 11 – 14 (mild excessive daytime sleepiness)
Moderate: 15 – 17 (moderate excessive daytime sleepiness; consider sleep study)
Severe: 18 – 24 (severe excessive daytime sleepiness; strongly consider medical evaluation)
Sarah is a 42-year-old who often feels tired during the day. She takes the ESS test:
| Question | Response | Score |
|---|---|---|
| Sitting and reading | Moderate chance | 2 |
| Watching TV | Moderate chance | 2 |
| Sitting in a public place | Slight chance | 1 |
| As a passenger in a car | Moderate chance | 2 |
| Lying down to rest | High chance | 3 |
| Sitting and talking | No chance | 0 |
| Sitting after lunch | Moderate chance | 2 |
| Stopped in traffic | Slight chance | 1 |
Total Score: 2 + 2 + 1 + 2 + 3 + 0 + 2 + 1 = 13
Classification: Sarah’s score of 13 falls in the Mild range (11–14). The calculator recommends: “You have mild excessive daytime sleepiness. Consider evaluating your sleep habits, and discuss with a healthcare provider if symptoms persist.
Several factors can influence your ESS score:
Sleep duration: Short sleep duration (< 6 hours) is a strong predictor of higher ESS scores. Chronic sleep deprivation significantly increases daytime sleepiness.
Sleep quality: Poor sleep quality — frequent awakenings, sleep apnea, or other sleep disorders — leads to higher daytime sleepiness.
Sleep disorders: Obstructive sleep apnea is the most common medical cause of excessive daytime sleepiness. Other conditions include narcolepsy, periodic limb movement disorder, and circadian rhythm disorders.
Medications: Sedative medications, antihistamines, antidepressants, and muscle relaxants can increase daytime sleepiness.
Alcohol and substance use: Alcohol consumption, especially close to bedtime, disrupts sleep architecture and can increase daytime sleepiness.
Mental health: Depression, anxiety, and chronic stress are associated with higher ESS scores.
Physical health: Chronic pain, heart disease, diabetes, and other medical conditions can affect sleep quality and daytime alertness.
Age: Daytime sleepiness tends to increase with age, though the clinical significance may vary.
The Epworth Sleepiness Scale is a questionnaire that measures your average daytime sleepiness. It works by asking you to rate your chance of dozing off in 8 different everyday situations, from 0 (no chance) to 3 (high chance). The total score (0–24) indicates your level of daytime sleepiness and helps screen for sleep disorders.
A normal ESS score is 10 or below. Scores of 11–14 indicate mild excessive daytime sleepiness, 15–17 indicate moderate, and 18–24 indicate severe excessive daytime sleepiness. Scores above 10 suggest you should consider discussing your sleepiness with a healthcare provider.
The ESS measures subjective daytime sleepiness (how likely you are to fall asleep), while the AHI (Apnea-Hypopnea Index) measures the objective number of breathing interruptions per hour during sleep. They are complementary tools — a high ESS may indicate a sleep disorder, and a sleep study (which produces an AHI) can confirm the diagnosis.
The highest possible score is 24, which would mean you rated every situation as a “high chance” of dozing (3 out of 3 across all 8 questions). A score of 24 indicates severe excessive daytime sleepiness.
An ESS score of 15 falls in the Moderate range (15–17). This indicates moderate excessive daytime sleepiness and suggests you should consider a sleep study or medical evaluation, as this level of sleepiness is associated with increased risks of accidents and health problems.
No, the ESS is a screening tool, not a diagnostic tool. It can indicate excessive daytime sleepiness, which is a common symptom of sleep apnea, but it cannot diagnose sleep apnea on its own. A formal diagnosis requires a sleep study (polysomnography).
The ESS can be used as needed to screen for daytime sleepiness or to monitor treatment effectiveness. For people being treated for sleep apnea, it’s common to repeat the ESS at follow-up visits (e.g., every 3–6 months) to ensure treatment is working.
The Epworth Sleepiness Scale was developed by Dr. Murray Johns at the Epworth Hospital in Melbourne, Australia, in 1991. It was initially published in the journal Sleep and has since become one of the most widely used sleepiness measures worldwide.
The standard ESS was developed and validated for adults (typically 18+ years). Modified versions of the ESS exist for children and adolescents, but they have different scoring and interpretation systems.
If your ESS score is above 10, consider discussing your sleepiness with a healthcare provider. They can evaluate potential causes, recommend appropriate screening, and help you develop a treatment plan if needed. Lifestyle changes like improving sleep hygiene, maintaining a regular sleep schedule, and increasing physical activity can also help.
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