1-Hour Timer
Press start. It counts down to zero and rings an alarm — nothing to download, nothing to sign up for.
About this 1-hour timer
A one-click 1-hour countdown, most often used for a full class or lecture, a long study block, or a nap that won't leave you groggy. It runs in your browser and rings when it reaches zero.
One hour
An hour is the default unit of scheduled time — lectures, appointments, classes, and meetings all cluster here. For deep work it's a strong block: long enough to get properly into something complex, short enough to stay sharp throughout. It's also the standard for slow-cooking check-ins and long-form practice.
1 hour in other units
| Seconds | 3,600 |
|---|---|
| Minutes | 60 |
| Hours | 1 |
| Milliseconds | 3,600,000 |
| Share of a day | 4.17% |
Tips for using a 1-hour timer
- For deep work, protect the full hour: notifications off, one task, nothing else open.
- An hour-long nap risks waking during deep sleep — either keep it to 20 minutes or extend to 90 for a full cycle.
- Hour-long practice blocks work well for instruments and languages, where consistency beats intensity.
Frequently asked questions
How do I set a 1-hour timer?
Press Start above and the page counts down from 1 hour on its own — nothing to type. Need a little longer? Press +1 min while it runs, or pick a nearby duration from the list.
How many seconds are in 1 hour?
1 hour is 3,600 seconds — 60 minutes or 1 hours. That's 4.17% of a day.
What is a 1-hour timer good for?
People commonly use a 1-hour timer for a full class or lecture, a long study block, or a nap that won't leave you groggy.
Will it keep time if I switch tabs?
Yes. The countdown is measured against your device clock rather than counting screen refreshes, so it stays accurate in a background tab and the alarm fires on time. For a timer this long, keep the device awake — some phones pause browser audio when locked.