Sleep Duration Calculator
Time in bed and time asleep are two different things. Measure both, accounting for the minutes it takes to fall asleep and any night wakings.
Bathroom trips, tossing and turning, checking the phone.
Your sleep breakdown will appear here after you calculate.
How it works
Eight hours in bed rarely means eight hours asleep. The minutes spent falling asleep plus any time awake during the night quietly shrink the total. This calculator subtracts both from your time in bed to estimate actual sleep.
If the gap between bedtime and real sleep surprises you, it is worth tracking for a week. Small, consistent habits around light, screens, and bedtime regularity tend to close the gap more reliably than any single trick.
These calculators give planning estimates based on average sleep cycle timing. They are not medical advice and cannot diagnose sleep problems. If poor sleep persists, talk to a clinician.