Epworth Sleepiness Scale Calculator — ESS Score & Daytime Sleepiness
Rate your chance of dozing off in eight common daytime situations to compute the Epworth Sleepiness Scale (ESS) score. Developed by Murray Johns in 1991, the ESS is the most widely used self-report measure of daytime sleepiness. A score above 10 suggests excessive daytime sleepiness warranting medical evaluation.
1. Sitting and reading
2. Watching TV
3. Sitting inactive in a public place (theatre, meeting)
4. As a passenger in a car for 1 hour without a break
5. Lying down to rest in the afternoon
6. Sitting and talking to someone
7. Sitting quietly after lunch without alcohol
8. In a car, stopped for a few minutes in traffic
Range 0–24; score > 10 suggests excessive daytime sleepiness
- 1
Items 1–4 total
0 + 0 + 0 + 0 = 0 - 2
Items 5–8 total
0 + 0 + 0 + 0 = 0 - 3
ESS total score
0 + 0 = 0
How does this calculator work?
Rate the chance of dozing off in 8 situations (0 = never, 3 = high) and sum for the ESS score (0–24). Normal: 0–10; mild EDS: 11–12; moderate: 13–15; severe: ≥ 16. Score > 10 warrants medical evaluation. Developed by Johns (1991); most widely used self-report daytime sleepiness measure.
Formula
How this is calculated
The Epworth Sleepiness Scale asks you to rate the chance of dozing off or falling asleep in eight ordinary situations using a 4-point scale: 0 = would never doze, 1 = slight chance, 2 = moderate chance, 3 = high chance. The eight situations were specifically chosen to vary in their soporific tendency — from low (talking to someone) to high (lying down to rest) — covering a range where both sleepy and alert individuals can be differentiated. You should rate each situation based on your general recent experience, even if you have not been in that exact situation recently.
The total score ranges from 0 to 24. The original validation by Johns (1991) defined 0–9 as normal and 10–24 as excessive daytime sleepiness (EDS). Subsequent refinements by the same author split the range further: 0–5 lower normal, 6–10 higher normal, 11–12 mild EDS, 13–15 moderate EDS, and 16–24 severe EDS. Scores above 10 are associated with conditions such as obstructive sleep apnea, narcolepsy, hypersomnia, and insufficient sleep syndrome, and should trigger further clinical evaluation including, where appropriate, polysomnography.
The ESS is a screening tool, not a diagnostic instrument, and results can be influenced by factors such as depression, sedating medications, shift work, or age. A high score should always be discussed with a healthcare provider. The scale is validated for use in adults; paediatric versions exist but use different reference ranges.
Frequently asked questions
A score above 10 suggests excessive daytime sleepiness and is a commonly used threshold for clinical follow-up. Scores of 11–12 indicate mild EDS, 13–15 moderate EDS, and 16–24 severe EDS. However, the ESS does not diagnose the cause — conditions ranging from sleep apnea to narcolepsy can produce elevated scores.
No. Some patients with objectively confirmed obstructive sleep apnea have normal ESS scores. The AHI (apnea-hypopnea index) from a sleep study is the gold-standard measure. A normal ESS with snoring, witnessed apneas, or morning headaches should still prompt clinical assessment.
The ESS measures the subjective experience of daytime sleepiness across general situations; it is not specific to sleep apnea. STOP-BANG is a quick screening tool specifically for obstructive sleep apnea risk using anatomical and clinical risk factors (snoring, tiredness, observed apnea, blood pressure, BMI, age, neck circumference, gender). The two tools complement each other.
Also known as
TG we-Calculate Editorial Team. (2026). Epworth Sleepiness Scale Calculator — ESS Score & Daytime Sleepiness [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/epworth-sleepiness-scale-calculator
TG we-Calculate Editorial Team. "Epworth Sleepiness Scale Calculator — ESS Score & Daytime Sleepiness." TG we-Calculate. 2026. https://we-calculate.com/calculator/epworth-sleepiness-scale-calculator.
TG we-Calculate Editorial Team, "Epworth Sleepiness Scale Calculator — ESS Score & Daytime Sleepiness," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/epworth-sleepiness-scale-calculator
@misc{wecalculate_epworth_sleepiness_scale_calculator, title = {Epworth Sleepiness Scale Calculator — ESS Score & Daytime Sleepiness}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/epworth-sleepiness-scale-calculator}}, year = {2026}, note = {TG we-Calculate} }
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