◑ HEALTH Updated July 25, 2026

Sleep Cycle Calculator

Wake between cycles instead of in the middle of deep sleep.

Plan by
Time (HH:MM, 24h)
Minutes to fall asleep
Result
Ad space · belowTool · horizontal

How it works

A full sleep cycle averages about 90 minutes. Working backwards from your alarm in 90-minute blocks — plus the time it takes you to drop off — lines your wake-up with light sleep rather than deep sleep.

Related tools

◕BMR Calculator◈Calorie Calculator▣Body Fat Calculator

Frequently asked questions

Why 90 minutes?

One cycle through light, deep and REM sleep averages roughly 90 minutes for adults, though it ranges from 80 to 110.

How many cycles do I need?

Five to six cycles, about 7.5 to 9 hours, suits most adults.

Comments

Comments aren't enabled yet. When you're ready, this is where a service like Giscus, Disqus, or a custom form would go — the slot is already reserved on every tool page.