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Calculate optimal bedtimes or wake-up times based on 90-minute sleep cycles for better rest.
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Calculate your BMR using the Mifflin-St Jeor equation.
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Try tool →Find your exact age in years, months, days, and more.
Try tool →Find the number of days between any two dates.
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Try tool →Learn how sleep cycles work, the 90-minute rule, and how to use a sleep calculator to find your optimal bedtime and wake-up time.
Read article →Learn what circadian rhythm is, how your body's internal clock regulates sleep, hormones, and metabolism, and how to reset it for better health.
Read article →Learn how to fix your sleep schedule with a step-by-step plan. Reset your circadian rhythm, use a sleep calculator, and build habits for consistent, restful sleep.
Read article →💡 Tip: For optimal rest, complete 5-6 sleep cycles (90 minutes each).