Alarm Calculator
Calculate optimal sleep and wake times based on sleep cycles.
Settings
About Sleep Cycles
A complete sleep cycle lasts about 90 minutes. Waking up at the end of a cycle helps you feel more refreshed. Adults typically need 5-6 cycles (7.5-9 hours) per night.
To Wake at 7:00 AM
Go to bed at one of these times:
9:45 PM
6 cycles - 9h 0m
11:15 PM
5 cycles - 7h 30m
12:45 AM
4 cycles - 6h 0m
2:15 AM
3 cycles - 4h 30m
If You Sleep Now (10:36 PM)
Set your alarm for:
3:21 AM
3 cycles - 4h 30m
4:51 AM
4 cycles - 6h 0m
6:21 AM
5 cycles - 7h 30m
7:51 AM
6 cycles - 9h 0m
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.