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Free sleep calculator and bedtime calculator. Enter your wake up time and get the best time to sleep on 90 minute cycles. Instant, private, no sign up.

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Website, pricing, platforms and company facts side by side.
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| Website | bedtimesleepcalculator.com | diffee.me |
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| Company | 2026 | — |
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In their own words, as submitted to SaaSHub.


BedtimeCalc is a free sleep calculator that tells you the best time to go to bed or wake up. Enter the time you need to wake up and it shows bedtimes that line up with 90 minute sleep cycles, so you can wake at the end of a cycle instead of in the middle of deep sleep. It allows about 15 minutes...
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As answered by people managing BedtimeCalc and Diffee.
BedtimeCalc's answer
BedtimeCalc keeps sleep planning simple. You enter one time and get bedtimes built on 90 minute sleep cycles, with about 15 minutes added for falling asleep. It is free, instant and private, with no sign up, no app download and no ads in the way of your result. It also comes with a blog of sleep guides, so you learn why those times work, not just what they are.
BedtimeCalc's answer
Choose BedtimeCalc if you want an answer in seconds without creating an account or handing over an email. It shows 6, 5, 4 and 3 cycle options so you can pick what fits your night, and it works the same on phone and desktop. Many sleep calculators push apps or sign ups. BedtimeCalc is just the calculator plus clear guides.
BedtimeCalc's answer
Anyone who wakes up groggy and wants a better sleep schedule: students, shift workers, busy parents, professionals with early starts, and athletes who plan recovery. It also suits people who are new to sleep cycles and want a simple, no jargon tool.
BedtimeCalc's answer
BedtimeCalc was built to make sleep timing easy. Most people know they need 7 to 9 hours, but waking up in the middle of a sleep cycle is what makes mornings feel heavy. The goal was a fast, private calculator that works out your best bedtime or wake time on 90 minute cycles, backed by a blog that explains the science in plain language.
BedtimeCalc's answer
HTML, CSS and JavaScript. Static pages that load fast, with the calculator running in the browser.
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