1. Sleepyti.me
The classic bedtime calculator built on 90-minute cycles.
Pros
- Dead-simple wake-time presets
- Fall-asleep latency included
Cons
- No tracking, history, or debt views
Best for: One-tap 'when should I sleep' answers · Price: Free
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4 tested picks · 4 with a free tier · Updated 2026-09-18
Best sleep calculator alternatives: Sleepyti.me — The classic bedtime calculator built on 90-minute cycles. Best fully free: Sleepyti.me. Compare all 4 below.
Waking mid-cycle is why alarms can leave you groggy after eight hours yet refreshed after six: sleep runs in roughly 90-minute cycles, and timing matters as much as duration. The tools below compute bedtimes and wake times from cycle math, with extras like sleep-debt tracking and nap planning.
Pair any calculator with consistent wake times — the single habit sleep researchers agree matters most — and use the numbers as a schedule scaffold, not a medical verdict.
| Tool | Price | Free tier | Best for | Rating |
|---|---|---|---|---|
| 😴Sleepyti.me | Free | One-tap 'when should I sleep' answers | 4.6 / 5 | |
| 🛏️Sleep Foundation | Free | Advice you can trust with context | 4.5 / 5 | |
| 📉Hillarys Sleep Calculator | Free | Visual planners and nap optimizers | 4.2 / 5 | |
| 🌙Omni Sleep | Free | Shift workers with irregular schedules | 4.3 / 5 |
Sponsored rows are highlighted but ranked by the same editorial order — payment never buys position.
The classic bedtime calculator built on 90-minute cycles.
Pros
Cons
Best for: One-tap 'when should I sleep' answers · Price: Free
Evidence-based sleep timing plus deep guides.
Pros
Cons
Best for: Advice you can trust with context · Price: Free
Visual cycle timeline from bedtime to alarm.
Pros
Cons
Best for: Visual planners and nap optimizers · Price: Free
Sleep timing with cited research per input.
Pros
Cons
Best for: Shift workers with irregular schedules · Price: Free
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