Formula
Bedtime = wake-up time − number of sleep cycles × 90 minutes − time to fall asleep.
Health & Body · Tool 610 of 200,000
Sleep Cycle Calculator
Enter your values for a transparent, reproducible sleep cycle calculator, with the formula and scope shown.
LiveScenario estimateLocal calculationUS · USD
Your inputs
Enter real numbers
✓ Inputs are calculated on this page and are not uploaded or saved.
Live result
Suggested bedtime
18:15
Planned sleep: 7.5 hours, plus 15 minutes to fall asleep.
- Estimated sleep time
- 18:30
- Wake-up time
- 07:00
- Number of cycles
- 5 cycles
Reproducible, not guessed
How was this calculated?
Scope
Use values that match your situation and location. Verify rule-based, contractual, financial or health decisions against an authoritative local source.
Model context
localeen-UScountryUScurrencyUSDtimezoneAmerica/New_Yorkunit_systemimperialrules_versionus-2026.08source_languageen-US
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.