Sleep Calculator is a free online tool that helps you plan your rest around the body's natural 90-minute sleep cycles, so you can wake up feeling refreshed instead of groggy.
Working with Sleep Calculator is simple: you can count backward from a target wake-up time to find the best moment to go to bed, or count forward from the current time to see when you should set your alarm. Either way, it builds in an estimated 15 minutes for falling asleep, so your schedule stays realistic.
Whether you are preparing for an early morning, recovering from a late night, or just trying to build better sleep habits, Sleep Calculator gives you practical bedtimes and wake-up times in seconds.
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