Sleep Efficiency Index
Sleep-efficiency index: total sleep time / time in bed x 100; >= 85% normal, < 75% poor.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Total sleep time
- 420 minutes
- Time in bed
- 480 minutes
Result: Sleep efficiency 87.5% — normal (>= 85%).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- >= 85%
- Normal.
- 75-84%
- Moderately reduced.
- < 75%
- Poor (associated with insomnia); > 95% may signal sleep deprivation. A ratio, not a diagnosis.
What you enter
- Total sleep time
- Time in bed
How this is calculated
Sleep efficiency = total sleep time / time in bed x 100 (standard sleep-medicine metric; see AASM references and Wikipedia "Sleep efficiency"). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.