What a 90 second timer is good for
- A 90-second plank, or a hollow hold if planks are too easy.
- Reading drills: read as far as you can in 90 seconds, then count the words.
- A video intro or a voice memo that should stay under a minute and a half.
- Reheating a plate of leftovers for 90 seconds before you stir and check.
Press Start and the countdown runs for exactly 1 minute 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.
1 minute 30 seconds in other units
The 90 second timer lasts 90 seconds, which is 1.5 minutes. Back to back, 40 runs fill an hour, and 320 fill an 8-hour workday. Measured against a whole day of 86,400 seconds, one run is just 0.104%.
| Seconds | 90 |
|---|---|
| Minutes | 1.5 |
| Hours, as a decimal | 0.025 |
| On the dial | 01:30 |
| Share of an hour | 2.5% |
| Share of an 8-hour workday | 0.313% |
| Share of a 24-hour day | 0.104% |
| Runs in one hour | 40 |
| Runs in an 8-hour workday | 320 |
90 Second Timer back to back
Start the 90 second timer again as soon as it rings and the rounds add up: two runs make 3 minutes, three make 4 minutes 30 seconds. Three of these totals have their own timers: 3 minute timer (2 runs), 6 minute timer (4 runs) and 12 minute timer (8 runs).
| Runs | Total time |
|---|---|
| 2 × 90 sec | 3 minutes |
| 3 × 90 sec | 4 minutes 30 seconds |
| 4 × 90 sec | 6 minutes |
| 6 × 90 sec | 9 minutes |
| 8 × 90 sec | 12 minutes |
Shorter and longer timers
The next shorter timer here is the 1 minute timer, 30 seconds less. One step up is the 2 minute timer, 30 seconds more. Halfway through, the dial reads 00:45, 45 seconds left. Two shorter timers that add up to 1 minute 30 seconds: the 30 second timer and the 1 minute timer, or the 45 second timer twice.
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 90 second timer run?
Exactly 90 seconds, or 1 minute 30 seconds. The dial starts at 01:30, counts down to zero and plays an alarm there.
How many 90 second timers fit into an hour?
40. An hour has 3,600 seconds, and 90 goes into it exactly 40 times. In an 8-hour workday, the count is 320.
What is 90 seconds in minutes?
1.5 minutes: divide 90 by 60. That is one full minute and 30 seconds, or 0.025 hours for a timesheet.
Will the 90 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 90 second timer to a different length?
Yes. The hours, minutes and seconds fields and the presets work as usual. This page only starts at 1 minute 30 seconds; every other length is one tap away, or open one of the timers linked above.