Sleep Calculator

Sleep Calculator is a free online sleep-planning tool designed to help people choose when to go to bed, wake up, or take a nap. It uses customizable sleep-cycle estimates—90 minutes by default—and accounts for the time needed to fall asleep and the user’s age group. Its calculator offers wake-up, bedtime, sleep-now, and nap modes, along with a personal plan for the evening that includes suggested timing for caffeine, screen use, and winding down.

Beyond its core calculator, the site provides tools to estimate weekly sleep debt and identify a chronotype through a short quiz. Users can explore browser-generated sleep sounds, including white, pink, and brown noise, rain, ocean waves, fan sounds, and calm music, with volume and timer controls. The service also offers reminders and shareable results. Informational resources explain sleep cycles and stages, recommended sleep by age, nap lengths, and habits that may support faster sleep. Sleep Calculator presents practical guidance and planning features in one accessible toolkit, while allowing users to personalize key estimates.