calculator / Sleep
Sleep duration calculator
How long a day’s sleep came to, from the times you wrote down.
Answers now
Sleep that day
10 h 30 min
- 9 h 30 min
- Night
- 1 h 0 min
- Nap
Time in bed, minus minutes awake in the night, plus that day’s nap.
Step by step
Whether waking was the next day or the same day is something you tick, because it cannot be inferred: 21:30 to 07:00 is either nine and a half hours overnight or a typo, and 13:00 to 15:30 is a nap. Night-time and nap are given separately, and shown separately.
What this number cannot tell you
This is not sleep tracking. Lights-out is the time you wrote down, not a moment a device detected, so time in bed usually exceeds time asleep. What you get is how long the interval you recorded was — not how long the child slept, and certainly not whether it was enough. That last one needs a reference by age, and none is published here yet.
An example
In bed at 21:30, awake at 07:00, no waking in the night, a 60-minute nap: 10 hours 30 minutes.
Common questions
- Will this tell me whether my child is normal?
- No. What happens here is arithmetic, and “normal” needs an age-based reference table before it means anything — there is none behind these figures. The section above spells out what stays out of reach.
- Do the numbers I type reach your server?
- No. Everything is worked out in the browser on this device, and the page has no channel for sending data out — the site’s security policy closes that route outright, so it is not a promise you have to take on trust. Reload and the numbers are gone; to keep them, copy them.
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