Epworth Sleepiness Scale Calculator
Rate your chance of dozing in 8 situations to get your ESS score and daytime sleepiness severity.
😴 What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale (ESS) is a validated, self-administered questionnaire developed by Dr. Murray Johns at Epworth Hospital in Melbourne, Australia, and first published in the journal Sleep in 1991. It measures a person's average level of daytime sleepiness — not how tired they feel after a bad night, but their general, chronic tendency to doze off during the day across a range of passive and mildly stimulating situations.
The test presents 8 common everyday situations and asks the respondent to rate the chance they would doze off in each on a four-point scale from 0 (would never doze) to 3 (high chance of dozing). Scores are summed to give a total ESS score between 0 and 24. Scores of 0–10 are considered normal; 11–12 suggest mild excessive daytime sleepiness (EDS); 13–15 indicate moderate EDS requiring medical evaluation; and 16–24 represent severe EDS that may impair daily functioning and make driving dangerous.
The ESS is widely used as a first-line clinical screening tool for sleep disorders, particularly obstructive sleep apnea (OSA), narcolepsy, and idiopathic hypersomnia. It is included in the American Academy of Sleep Medicine (AASM) clinical practice guidelines and is one of the most cited instruments in sleep medicine research, with over 4,000 published studies using it as an outcome measure.
📐 ESS Scoring
Epworth Sleepiness Scale Score
ESS = Sum of ratings for all 8 situations | Range: 0 to 24
Each situation rated: 0 = never, 1 = slight, 2 = moderate, 3 = high chance of dozing
Score Interpretation
0 – 10: Normal — unlikely to have abnormal daytime sleepiness
11 – 12: Mildly sleepy — above average; review sleep hygiene
13 – 15: Moderately sleepy — consult a doctor; sleep study may be needed
16 – 24: Severely sleepy — seek medical attention promptly; driving may be unsafe
📖 How to Use This Calculator
Steps
1
Read each situation and select the rating that best describes your chance of dozing: 0 (never), 1 (slight), 2 (moderate), or 3 (high chance). Base your answers on the past month, not just today.
2
Rate all 8 situations — include situations you have not been in recently. Estimate how likely you would be to doze if you were in that situation.
3
Click Calculate Score to see your total ESS score out of 24, your severity category, and clinical guidance appropriate for your score range.
4
Track over time — re-take the ESS after 4–8 weeks of treatment or lifestyle changes (new CPAP, sleep hygiene improvements). A reduction of 3+ points indicates a meaningful clinical improvement.
💡 Example Score Profiles
Example 1 — Score 4 (Normal range, well-rested individual)
1
Ratings: Reading=1, TV=0, Public=0, Car passenger=1, Afternoon rest=2, Talking=0, After lunch=0, Traffic=0. Total = 4.
ESS: 4 / 24 — Normal Alertness. Unlikely to have a sleep disorder. Maintain consistent 7–9 hour sleep schedule.
Example 2 — Score 14 (Moderate EDS, suspected sleep apnea)
1
Ratings: Reading=2, TV=2, Public=2, Car passenger=3, Afternoon rest=3, Talking=0, After lunch=1, Traffic=1. Total = 14.
ESS: 14 / 24 — Moderately Sleepy. A medical consultation is recommended. This score is typical of untreated mild-to-moderate obstructive sleep apnea.
Example 3 — Score 19 (Severe EDS, possibly narcolepsy or severe OSA)
1
Ratings: Reading=3, TV=3, Public=2, Car passenger=3, Afternoon rest=3, Talking=1, After lunch=3, Traffic=1. Total = 19.
ESS: 19 / 24 — Severely Sleepy. Seek medical attention promptly. Scores in this range are strongly associated with narcolepsy, severe OSA, or idiopathic hypersomnia. Driving is potentially unsafe.
❓ Frequently Asked Questions
What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale (ESS) is a validated, self-administered questionnaire developed by Dr. Murray Johns and first published in 1991. It measures chronic daytime sleepiness by asking respondents to rate their chance of dozing in 8 everyday situations on a 0–3 scale. Total scores range from 0 to 24. The ESS is widely used in sleep medicine clinics, primary care screening, and research studies worldwide as a first-line daytime sleepiness measure.
What is a normal ESS score?
Scores from 0 to 10 are considered within the normal range; most healthy adults without a sleep disorder score between 2 and 10. A score of 11 or above indicates some degree of excessive daytime sleepiness. Clinical thresholds: 0–10 normal; 11–12 mildly excessive; 13–15 moderately excessive; 16–24 severely excessive. Some guidelines use 11 as the clinical follow-up cut-off; others use 10 or higher.
What causes excessive daytime sleepiness?
Common causes include: obstructive sleep apnea (OSA) — most common, where airway blockages fragment sleep; chronic sleep deprivation from insufficient time in bed; narcolepsy and idiopathic hypersomnia (rare but important); restless leg syndrome and periodic limb movement disorder; circadian rhythm disorders (shift work, delayed sleep-wake phase); depression and anxiety; hypothyroidism; and sedating medications including antihistamines, benzodiazepines, opioids, and some antidepressants.
Is the Epworth Sleepiness Scale validated?
Yes. The ESS has been extensively validated across multiple cultures, age groups, and languages. It shows good internal consistency (Cronbach's alpha 0.73–0.88 across studies), strong test-retest reliability over a four-week interval, and significant correlations with objective measures including the multiple sleep latency test (MSLT) and polysomnographic apnea-hypopnea index (AHI). It is included in AASM guidelines for OSA screening.
How is the ESS different from the Pittsburgh Sleep Quality Index?
The ESS measures excessive daytime sleepiness — the tendency to doze in passive situations. The Pittsburgh Sleep Quality Index (PSQI) measures sleep quality over the past month across seven components: subjective quality, latency, duration, efficiency, disturbances, medication use, and daytime dysfunction. The ESS takes about 1 minute; the PSQI takes 5–10 minutes. They measure different constructs and are often used together in clinical practice.
Should I see a doctor if my ESS score is above 10?
An ESS score above 10 warrants a discussion with your doctor, particularly if sleepiness affects work, driving safety, or quality of life. Your doctor may ask about snoring, witnessed apneas, and morning headaches (suggesting OSA) and may order a home sleep apnea test or full polysomnography. Scores above 15 are particularly likely to reflect an underlying sleep disorder requiring treatment.
Can sleep apnea cause a high ESS score?
Yes. Obstructive sleep apnea (OSA) is the most common cause of high ESS scores in adults. Repeated airway obstructions fragment sleep architecture and suppress deep restorative sleep, leaving patients profoundly sleepy during the day. Studies show mean ESS scores of 12–16 in untreated moderate-to-severe OSA. Effective CPAP therapy typically reduces ESS scores by 4–8 points within weeks of starting treatment.
Does sleep deprivation raise ESS scores?
Yes. Chronic sleep deprivation — sleeping less than your biological need — reliably increases ESS scores. Even mild restriction of 1–2 hours less than needed per night can elevate ESS scores by 3–5 points after several days. If your score normalises after a period of adequate sleep (a week of full-length nights), the cause was behavioural sleep insufficiency rather than a pathological disorder.
How often should I take the Epworth test?
Taking the ESS every 3–6 months provides useful longitudinal data, especially during treatment for a sleep disorder. Re-testing after starting CPAP, changing sleep habits, or treating a medical condition shows whether the intervention is working. For healthy individuals without symptoms, a single periodic baseline screening is sufficient unless sleepiness develops or worsens.
Can narcolepsy be detected with the ESS?
The ESS is a useful screening tool — people with narcolepsy type 1 typically score between 17 and 22. However, the ESS cannot diagnose narcolepsy, which requires the multiple sleep latency test (MSLT) showing mean sleep onset latency of 8 minutes or less with two or more sleep-onset REM periods, plus CSF hypocretin-1 measurement in type 1. The ESS identifies candidates for further investigation.
Is the pediatric ESS different from the adult ESS?
For children aged 2–12, modified pediatric ESS versions exist with age-appropriate situations. The Pediatric Daytime Sleepiness Scale (PDSS) is also commonly used for school-age children. For teenagers aged 13 and above, the standard adult ESS is generally considered applicable, though normative values differ slightly from the adult population. This calculator uses the standard adult ESS validated for adults aged 18 and over.
What sleep disorders are associated with high ESS scores?
Sleep disorders commonly associated with elevated ESS scores: obstructive sleep apnea (most common, mean ESS 12–16 in moderate-severe cases); narcolepsy type 1 and 2 (ESS typically 17–22); idiopathic hypersomnia (ESS often 14–18); restless leg syndrome and periodic limb movements (mild elevation); circadian rhythm disorders such as shift work disorder and delayed sleep-wake phase disorder; and upper airway resistance syndrome (similar to OSA). Depression and hypothyroidism also raise scores.