Epworth Sleepiness Scale
Free online Epworth Sleepiness Scale calculator to assess daytime sleepiness. Answer 8 questions, get your ESS score from 0-24 with severity interpretation and charts.
For each situation below, select how likely you are to doze off or fall asleep. Use the following scale:
0 = Would never doze | 1 = Slight chance | 2 = Moderate chance | 3 = High chance
About This Calculator
About the Epworth Sleepiness Scale
The Epworth Sleepiness Scale (ESS) is a validated medical screening questionnaire developed by Dr. Murray Johns at Epworth Hospital in Melbourne, Australia. It measures your general level of daytime sleepiness by asking how likely you are to doze off or fall asleep in 8 common everyday situations. Each situation is rated from 0 (would never doze) to 3 (high chance of dozing), producing a total score between 0 and 24.
The ESS is widely used in sleep medicine as a first-line screening tool for conditions such as obstructive sleep apnea, narcolepsy, idiopathic hypersomnia, and other sleep disorders. It helps clinicians determine whether further diagnostic testing, such as a polysomnography (sleep study) or Multiple Sleep Latency Test (MSLT), is warranted. The questionnaire takes only 2–3 minutes to complete but provides valuable insight into your sleep health.
How the Score Is Calculated
Your ESS score is the sum of your responses to all 8 questions, each scored 0–3. The total ranges from 0 to 24. Scores are categorized as: 0–5 (Lower Normal Daytime Sleepiness), 6–10 (Higher Normal Daytime Sleepiness), 11–12 (Mild Excessive Daytime Sleepiness), 13–15 (Moderate Excessive Daytime Sleepiness), and 16–24 (Severe Excessive Daytime Sleepiness). A score above 10 generally warrants further evaluation by a healthcare professional.
Regional Notes
India: The ESS is used by Indian sleep physicians and pulmonologists to screen for obstructive sleep apnea, which affects an estimated 10–15% of the urban Indian population. The All India Institute of Medical Sciences (AIIMS) and other major hospitals routinely use the ESS in their sleep disorder clinics. If you have symptoms like loud snoring, witnessed breathing pauses, or excessive daytime sleepiness, consult a sleep specialist.
United States: The American Academy of Sleep Medicine (AASM) recommends the ESS as a standard screening tool for hypersomnia and sleep-related breathing disorders. It is commonly administered in primary care, neurology, and pulmonary clinics. An ESS score above 10, combined with other risk factors, often triggers a referral for a sleep study.
United Kingdom: The National Institute for Health and Care Excellence (NICE) recognizes the ESS as a validated tool for assessing daytime sleepiness in the context of suspected sleep apnea. The NHS uses the ESS both for initial screening and for monitoring treatment effectiveness, such as response to CPAP therapy in obstructive sleep apnea patients.
Frequently Asked Questions
What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale (ESS) is a validated medical screening questionnaire that measures your general level of daytime sleepiness. It asks how likely you are to doze off in 8 common situations, each rated 0–3, for a total score ranging from 0 (normal) to 24 (severe excessive sleepiness).
How is the ESS score interpreted?
The ESS total score ranges from 0 to 24. Scores are interpreted as follows: 0–5 Lower Normal Daytime Sleepiness, 6–10 Higher Normal Daytime Sleepiness, 11–12 Mild Excessive Daytime Sleepiness, 13–15 Moderate Excessive Daytime Sleepiness, and 16–24 Severe Excessive Daytime Sleepiness. A score above 10 may warrant further evaluation by a healthcare professional.
What conditions can cause a high ESS score?
A high ESS score (above 10) may indicate excessive daytime sleepiness caused by conditions such as obstructive sleep apnea, narcolepsy, restless legs syndrome, depression, insomnia, or other sleep disorders. It can also result from lifestyle factors like chronic sleep deprivation or shift work. A healthcare professional should evaluate persistently high scores.
Can I use the ESS for self-diagnosis?
No. The Epworth Sleepiness Scale is a screening tool, not a diagnostic instrument. It cannot replace a comprehensive medical evaluation by a qualified healthcare professional. If you have concerns about your sleepiness levels, please consult a doctor or a sleep specialist for proper assessment and diagnosis.
Is the ESS suitable for everyone?
The standard ESS is validated for adults aged 18 and above. For children and adolescents, a modified version called the Pediatric Epworth Sleepiness Scale (ESS-CHAD) is available. The ESS is used worldwide in countries including India, the United States, and the United Kingdom as a standard screening tool for daytime sleepiness.
How long does it take to complete the ESS?
The Epworth Sleepiness Scale takes approximately 2–3 minutes to complete. It consists of 8 simple questions about your likelihood of dozing off in different everyday situations. The quick administration time makes it a practical screening tool in both clinical and occupational settings.
What is a normal ESS score?
A normal ESS score ranges from 0 to 10. Scores of 0–5 indicate lower normal daytime sleepiness, while 6–10 indicate higher normal daytime sleepiness. Most healthy adults score between 4 and 8. Scores above 10 suggest excessive daytime sleepiness and may warrant further medical investigation.
How is the ESS used in sleep medicine?
In sleep medicine, the ESS is used by physicians in India, the US, and the UK as a first-line screening tool for sleep disorders. It helps identify patients who may need polysomnography (sleep study) for conditions like obstructive sleep apnea. The ESS is also used to monitor treatment response, for example after CPAP therapy for sleep apnea patients.