Free Tools
Sleep Tools
Simple, free calculators to help you sleep better. No sign-up required.
Tool
Bedtime Calculator
Enter your wake-up time and get four optimal bedtimes based on 90-minute sleep cycles.
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Sleep Debt Calculator
Set your nightly shortfall and number of nights to see how much sleep debt has built up — and how long recovery takes.
Tool
Caffeine Cutoff Calculator
Enter your bedtime and caffeine sensitivity to find the latest time caffeine is unlikely to affect your sleep.
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Sleep Journal
Log your bedtime, wake time, and sleep quality to spot patterns over time. Saved on your device only — no account, no cloud.