What a 30 second timer is good for
- A side plank on each side, or a 30-second hollow hold.
- Mouthwash, when the label says to swish for 30 seconds.
- Pitch practice: say what your project does before the alarm, then cut the rest.
- Short rests between sets when the plan calls for 30 seconds.
Press Start and the countdown runs for exactly 30 seconds. It shows in the tab title too, so you can work in another tab and still see the time left. When it reaches zero, a gentle alarm plays and the dial flashes until you stop it.
30 seconds in other units
The 30 second timer lasts 30 seconds, which is 0.5 minutes. Back to back, 120 runs fill an hour, and 960 fill an 8-hour workday. Measured against a whole day of 86,400 seconds, one run is just 0.0347%.
| Seconds | 30 |
|---|---|
| Minutes | 0.5 |
| Hours, as a decimal | 0.0083 |
| On the dial | 00:30 |
| Share of an hour | 0.833% |
| Share of an 8-hour workday | 0.104% |
| Share of a 24-hour day | 0.0347% |
| Runs in one hour | 120 |
| Runs in an 8-hour workday | 960 |
30 Second Timer back to back
Start the 30 second timer again as soon as it rings and the rounds add up: two runs make 1 minute, three make 1 minute 30 seconds. Five of these totals have their own timers: 1 minute timer (2 runs), 90 second timer (3 runs), 2 minute timer (4 runs), 3 minute timer (6 runs) and 4 minute timer (8 runs).
| Runs | Total time |
|---|---|
| 2 × 30 sec | 1 minute |
| 3 × 30 sec | 1 minute 30 seconds |
| 4 × 30 sec | 2 minutes |
| 6 × 30 sec | 3 minutes |
| 8 × 30 sec | 4 minutes |
Shorter and longer timers
The next longer timer is the 45 second timer, 15 seconds more. Halfway through, the dial reads 00:15, 15 seconds left.
Other timer lengths
- 30 Second Timer
- 45 Second Timer
- 1 Minute Timer
- 90 Second Timer
- 2 Minute Timer
- 3 Minute Timer
- 4 Minute Timer
- 5 Minute Timer
- 6 Minute Timer
- 7 Minute Timer
- 8 Minute Timer
- 10 Minute Timer
- 12 Minute Timer
- 15 Minute Timer
- 20 Minute Timer
- 25 Minute Timer
- 30 Minute Timer
- 40 Minute Timer
- 45 Minute Timer
- 50 Minute Timer
- 1 Hour Timer
- 90 Minute Timer
- 2 Hour Timer
Want to time something without an end point? The stopwatch counts up with lap times. For a date rather than a duration, the countdown timer counts the days and hours to an event.
Frequently asked questions
How long does the 30 second timer run?
Exactly 30 seconds, or 30 seconds. The dial starts at 00:30, counts down to zero and plays an alarm there.
How many 30 second timers fit into an hour?
120. An hour has 3,600 seconds, and 30 goes into it exactly 120 times. In an 8-hour workday, the count is 960.
What is 30 seconds in minutes?
0.5 minutes: divide 30 by 60. That is 50% of a minute, or 0.0083 hours for a timesheet.
Will the 30 second timer ring if I switch tabs?
Yes. The timer works from the moment it should end, not from ticks, and the alarm is scheduled on the browser's audio clock, which keeps running in background tabs. Keep the sound on and the tab open.
Can I change the 30 second timer to a different length?
Yes. The hours, minutes and seconds fields and the presets work as usual. This page only starts at 30 seconds; every other length is one tap away, or open one of the timers linked above.