We Help You Wake Up Refreshed — Every Morning
WakeCalc is a free sleep cycle calculator built on one simple idea: waking up at the right time in your sleep cycle makes all the difference between a groggy morning and a great one.
Our Mission
Millions of people wake up feeling exhausted every single day — not because they slept too little, but because they woke up at the wrong point in their sleep cycle. WakeCalc exists to fix that. We use the science of 90-minute sleep cycles to calculate the exact times you should go to sleep or wake up — for free, forever.
The Science Behind WakeCalc
Sleep research has consistently shown that the human brain moves through sleep cycles of approximately 90 minutes each night. Each cycle includes light sleep, deep sleep, and REM sleep. Waking up at the end of a complete cycle — rather than in the middle of deep sleep — results in significantly less grogginess and better mental clarity throughout the day. WakeCalc calculates your ideal sleep and wake times based on this well-established 90-minute cycle model, adding 15 minutes to account for average sleep latency (the time it takes to fall asleep).
Why Is WakeCalc Free?
WakeCalc is and will always be completely free to use. We believe better sleep should be accessible to everyone. The site is supported by display advertising which allows us to keep the tool free for all users worldwide.
Have a question or suggestion?
We’d love to hear from you. WakeCalc is constantly improving and your feedback helps.
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