What a 45 second timer is good for
- Interval rounds of 45 seconds on and 15 seconds off, which makes one round per minute.
- A wall sit or a dead hang from the pull-up bar.
- Speaking tests: answer the question in 45 seconds, then stop.
- Microwave reheating in 45-second steps, with a stir in between.
One press on Start begins the 45 seconds. The time left also sits in the browser tab title, handy while you work somewhere else, and at zero an alarm sounds and the dial flashes until you press Stop.
45 seconds in other units
The 45 second timer lasts 45 seconds, which is 0.75 minutes. Back to back, 80 runs fill an hour, and 640 fill an 8-hour workday. Measured against a whole day of 86,400 seconds, one run is just 0.0521%.
| Seconds | 45 |
|---|---|
| Minutes | 0.75 |
| Hours, as a decimal | 0.0125 |
| On the dial | 00:45 |
| Share of an hour | 1.25% |
| Share of an 8-hour workday | 0.156% |
| Share of a 24-hour day | 0.0521% |
| Runs in one hour | 80 |
| Runs in an 8-hour workday | 640 |
45 Second Timer back to back
Start the 45 second timer again as soon as it rings and the rounds add up: two runs make 1 minute 30 seconds, three make 2 minutes 15 seconds. Three of these totals have their own timers: 90 second timer (2 runs), 3 minute timer (4 runs) and 6 minute timer (8 runs).
| Runs | Total time |
|---|---|
| 2 × 45 sec | 1 minute 30 seconds |
| 3 × 45 sec | 2 minutes 15 seconds |
| 4 × 45 sec | 3 minutes |
| 6 × 45 sec | 4 minutes 30 seconds |
| 8 × 45 sec | 6 minutes |
Shorter and longer timers
The next shorter timer here is the 30 second timer, 15 seconds less. One step up is the 1 minute timer, 15 seconds more.
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
Counting down to a day, not a few minutes? Use the countdown timer. To measure how long something took, the stopwatch is the better fit, and the time duration calculator works out the time between two clock times.
Frequently asked questions
How long does the 45 second timer run?
Exactly 45 seconds, or 45 seconds. The dial starts at 00:45, counts down to zero and plays an alarm there.
How many 45 second timers fit into an hour?
80. An hour has 3,600 seconds, and 45 goes into it exactly 80 times. In an 8-hour workday, the count is 640.
What is 45 seconds in minutes?
0.75 minutes: divide 45 by 60. That is 75% of a minute, or 0.0125 hours for a timesheet.
Does the 45 second timer keep running in a background tab?
It does. The end time is fixed when you press Start, so a slow background tab cannot make it drift, and the alarm waits on the browser's audio clock. Leave the sound on and do not close the tab.
Can I set a length other than 45 seconds?
Sure. Type any hours, minutes and seconds into the fields or tap a preset. The page opens at 45 seconds, nothing more; the links above lead to the other common lengths.