Calculate your Epworth Sleepiness Scale (ESS) score from 8 everyday situations to rate daytime sleepiness from 0 to 24 and find your severity level.
Epworth Sleepiness Scale Formula
The Epworth Sleepiness Scale (ESS) score is the sum of eight ratings, one for each everyday situation. You rate each situation from 0 to 3, so the total runs from 0 to 24.
ESS = I1 + I2 + I3 + I4 + I5 + I6 + I7 + I8
- ESS = total Epworth Sleepiness Scale score (0 to 24)
- I1 = chance of dozing while sitting and reading (0 to 3)
- I2 = chance of dozing while watching TV (0 to 3)
- I3 = chance of dozing while sitting inactive in a public place, such as a theater or meeting (0 to 3)
- I4 = chance of dozing as a passenger in a car for an hour without a break (0 to 3)
- I5 = chance of dozing while lying down to rest in the afternoon (0 to 3)
- I6 = chance of dozing while sitting and talking to someone (0 to 3)
- I7 = chance of dozing while sitting quietly after lunch without alcohol (0 to 3)
- I8 = chance of dozing in a car while stopped for a few minutes in traffic (0 to 3)
Every item uses the same rating scale: 0 means you would never doze, 1 a slight chance, 2 a moderate chance, and 3 a high chance of dozing. Rate the chance of actually falling asleep, not just feeling tired, based on your usual recent weeks. If you have not been in a situation lately, estimate how it would affect you.
The calculator adds your eight answers to produce the 0 to 24 total, then matches that total to a severity band. If a provider has already given you a total, the interpret mode maps that number to the same bands without re-entering every answer. The details also show two descriptive item subtotals. These groupings are not validated severity subscales and do not identify a cause:
Active subtotal = I6 + I8
- Active subtotal = chance of dozing during the two more alert situations, talking and sitting in stopped traffic (0 to 6)
- Passive subtotal = the remaining six restful situations (0 to 18)
Mention concerning dozing episodes to a healthcare professional. No diagnostic threshold is assigned to either descriptive subtotal. Do not drive when sleepy.
Epworth Score Ranges and Typical Values
The first table shows how the total maps to a severity band. The second table lists average ESS scores reported for different groups in the original 1991 validation study by Murray Johns, so you can see roughly where a score tends to fall for each group. The condition averages are the piece most score pages leave out, and they give a real reference point instead of a single normal or abnormal label.
| Total score | Interpretation | What it suggests |
|---|---|---|
| 0 to 5 | Lower normal daytime sleepiness | Typical for a well rested adult |
| 6 to 10 | Higher normal daytime sleepiness | Still normal, but review your sleep habits |
| 11 to 12 | Mild excessive daytime sleepiness | Above normal; consider talking to a provider |
| 13 to 15 | Moderate excessive daytime sleepiness | A provider may suggest further testing |
| 16 to 24 | Severe excessive daytime sleepiness | Ask a provider about further evaluation |
| Group | Average ESS score |
|---|---|
| Healthy adults (control group) | 5.9 |
| Primary snoring, no sleep disorder | 6.5 |
| Periodic limb movement disorder | 9.2 |
| Obstructive sleep apnea | 11.7 |
| Narcolepsy | 17.5 |
| Idiopathic hypersomnia | 17.9 |
These averages overlap, so a single score cannot tell you which condition, if any, you have. They show the pattern: scores near 6 are typical without a sleep disorder, scores near 12 are common with sleep apnea, and scores near 17 or higher are seen with narcolepsy and idiopathic hypersomnia.
Example Problems
Example 1. You rate the eight situations as 1, 2, 1, 2, 3, 0, 1, 2. Adding them gives 1 + 2 + 1 + 2 + 3 + 0 + 1 + 2 = 12, which falls in the 11 to 12 band, mild excessive daytime sleepiness. The active subtotal is item 6 plus item 8, or 0 + 2 = 2, which is a descriptive subtotal rather than a validated cutoff. Mention dozing while stopped in traffic to a healthcare professional.
Example 2. You rate the situations as 1, 1, 0, 1, 1, 0, 1, 0. The total is 1 + 1 + 0 + 1 + 1 + 0 + 1 + 0 = 5, which lands in the 0 to 5 band, lower normal daytime sleepiness. The descriptive talking and stopped-traffic subtotal is 0; it does not rule out a sleep disorder.
FAQ
What is a normal Epworth Sleepiness Scale score?
A total of 0 to 10 is considered normal daytime sleepiness. Scores of 0 to 5 sit at the lower end and 6 to 10 at the higher end of normal. A total of 11 or more points to excessive daytime sleepiness that is worth discussing with a healthcare provider.
Does a high score mean I have sleep apnea or narcolepsy?
No. The ESS measures the symptom of daytime sleepiness, not any specific condition. A high score means you tend to doze off easily, which can happen with sleep apnea, narcolepsy, insufficient sleep, medications, and other causes. It is used as a screening step, and a provider confirms a diagnosis with a sleep study or other tests.
How should I answer if I have not been in one of the situations recently?
Estimate how the situation would affect you if it happened now. The scale asks about your usual way of life in recent times, so a reasonable estimate for a situation you rarely encounter is expected and keeps the total meaningful.
