Power Nap
Power Nap: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.
Power Nap
Lie down at (hour)h
Lie down at (minute)min
I usually fall asleep inmin
Full 90-min cycle instead of 20 min (1 = yes)
Set the alarm in
27min
Alarm at
14:27
Sleep length
20min
Nap type
Power nap: no deep sleep, no grogginess
More about: Power Nap
What it calculates
The “Power Nap” calculator computes Set the alarm in in min from 4 parameters: lie down at (hour) (h), lie down at (minute) (min), i usually fall asleep in (min), full 90-min cycle instead of 20 min (1 = yes).
Used by professionals and patients to assess health metrics, dosages, and risks.
Example calculation
With parameters Lie down at (hour) = 14 h, Lie down at (minute) = 0 min, I usually fall asleep in = 7 min, Full 90-min cycle instead of 20 min (1 = yes) = 0 the result is 27 min (The best time for a nap is the early-afternoon dip, around 13:00–15:00).
How to use
- Enter lie down at (hour), lie down at (minute), i usually fall asleep in and full 90-min cycle instead of 20 min (1 = yes) — each field above is adjustable with a slider.
- Set the alarm in (min) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.
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