Find Your Perfect Bedtime
Choose your desired sleep duration using a preset or enter your own hours and minutes. Then set your wake-up time and confirm your time zone. We do the rest.
Wake Up Refreshed.
Every Single Day.
Enter your wake-up time and how long you want to sleep. We calculate the exact bedtime you need, adjusted for your time zone, anywhere in the world.
Find Your Perfect Bedtime
Choose your desired sleep duration using a preset or enter your own hours and minutes. Then set your wake-up time and confirm your time zone. We do the rest.
Timezone: Asia/Kolkata (GMT +5:30)
Why Your Bedtime Calculation Matters
Most people guess when to go to bed. Guessing leads to waking up groggy, hitting snooze three times, and dragging through the morning. A precise bedtime removes the guesswork entirely.
Hit Your Ideal Duration
Get exactly the sleep you planned without an alarm doing manual math for you. Set it and know it.
No More Foggy Mornings
Stop waking up mid-sleep-cycle, which causes that heavy, foggy feeling. Wake at the right moment, refreshed.
Plan Your Evening
Build your night around a real target time, not a rough estimate. Know exactly when to start winding down.
Works for Shift Workers
Works for shift workers, travelers, and anyone crossing time zones. Handles times that cross midnight correctly.
Always Accurate
Takes your local timezone into account including DST rules, so the result is always correct no matter where you are.
Zero Friction
No account, no login, no data stored. Open the page, calculate, get your result. Done in seconds.
How the Sleep Calculator Works
The math is simple. We subtract your desired sleep duration from your wake-up time and display the result as your target bedtime. The time zone layer makes sure that bedtime reflects your real local clock, not a generic UTC value.
Pick your sleep duration
Choose a preset (6h to 9h) or type custom hours and minutes.
Enter your wake-up time
Set the time you need to get up - works for any time, including night shifts.
Confirm your time zone
Auto-filled from your device, fully editable with any IANA time zone.
Click Calculate Sleep Time
One tap and the calculation runs instantly in your browser.
See your exact bedtime
Your target bedtime and full sleep summary appear immediately below.
Everything You Need to Know
Everything you need to know about using the Sleep Calculator.
How is my time zone detected?
Intl.DateTimeFormat API to read your device's current time zone automatically. No location permissions are needed.
Can I change the time zone manually?
What if I work night shifts?
Does it account for daylight saving time?
Is there a minimum or maximum sleep duration?
Do I need to create an account?
Ready to Stop Guessing Your Bedtime?
Scroll back up, enter your wake-up time and your target sleep duration, and get your exact bedtime in seconds. No login. No ads. Just the answer you need.
Free, instant, and works anywhere in the world.
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