Set an alarm for 16:21
⏰ The alarm will ring at 4:21 PM — in 14 h 18 min
Set an alarm for another time
Best bedtimes to wake up at 4:21 PM
| Go to bed at | Sleep cycles | Sleep |
|---|---|---|
| 7:06 AM | 6 | 9 h |
| 8:36 AM | 5 | 7 h 30 min |
| 10:06 AM | 4 | 6 h |
| 11:36 AM | 3 | 4 h 30 min |
Assumes about 15 minutes to fall asleep and sleep cycles of roughly 90 minutes. Cycle length varies from person to person, so treat these as estimates.
Snooze times after a 4:21 PM alarm
| Snooze length | 1st | 2nd | 3rd |
|---|---|---|---|
| 5 minutes | 4:26 PM | 4:31 PM | 4:36 PM |
| 9 minutes | 4:30 PM | 4:39 PM | 4:48 PM |
| 10 minutes | 4:31 PM | 4:41 PM | 4:51 PM |
Nine minutes is the traditional snooze length on many alarm clocks.
About 4:21 PM
The 4 PM hour is late afternoon. U.S. stock markets close at 4:00 PM Eastern Time.
Press “Start Alarm” and keep this tab open; press “Test Alarm” first to check the volume.
About 4:21 PM
| 12-hour clock | 4:21 PM |
|---|---|
| 24-hour clock | 16:21 |
| Military time | 1621 |
| In words | Twenty-one minutes past four |
| Part of the day | Afternoon |
Questions about a 16:21 alarm
How do I set an alarm for 16:21?
Open this page, press “Start Alarm” and leave the tab open. The alarm rings at 4:21 PM, which is 14 hours, 18 minutes from now.
What time should I go to bed to wake up at 4:21 PM?
For five full sleep cycles, go to bed around 8:36 AM; for six cycles, around 7:06 AM.