Health Calculators
Chronotype Calculator
Estimate your chronotype (morningness-eveningness tendency), social jet lag, and a suggested sleep schedule.
About This Calculator
What It Does
This calculator estimates your chronotype based on your preferred sleep timing, energy peak, and morning difficulty. Chronotype reflects your natural tendency to feel alert earlier or later in the day.
Worked Example
If you naturally prefer sleeping from midnight to 8 AM, feel most energetic in the afternoon, and have moderate difficulty waking early, your result is likely intermediate. Social jet lag occurs if your required schedule conflicts with your natural preference.
Real-World Usage
Understanding your chronotype can help you schedule work, study, and exercise at times when you are naturally more alert. Social jet lag โ the mismatch between your internal clock and your external schedule โ is common in shift workers and early-start cultures.
Local Context
Chronotype varies by age. Teenagers and young adults tend to have later chronotypes (evening preference). Older adults tend to shift earlier. Cultural factors such as siesta traditions or late dinner times can also influence natural sleep timing.
Last reviewed: May 2026.
This calculator provides an educational estimate of your chronotype. Chronotype is a tendency, not a fixed category. Individual sleep needs vary.
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