45 Second Timer
Press Start and it counts down 45 seconds on a big display, then rings with the sound you pick. Space starts and pauses.
45 seconds
Alarm: Bell
Spacestart or pauseRreset+ / −a minuteFfull screenMmute
Sound and moreBell
A different length
How this works: 1 source, Checked against 1 worked example,
How this works
How it’s tested
One worked example for this page is checked by automated tests before every release: given the inputs, the tool must show the expected answer.
Changes
- Added 10, 20, 30, 45 and 90 second timer pages, each with its own uses, a table and cited facts.
- A timer opened from a link no longer resets on reload, a tap brings the sound back after one, and on phones Start is on the first screen.
- First published.
Why 45 seconds suits circuits
Forty-five seconds of work and fifteen of rest is a common circuit format in gyms and home workouts, and the reason is arithmetic: every station takes exactly one minute. Eight stations make an eight-minute round, and three rounds make a 24-minute session, so the whole plan fits on the clock without a calculator. The fifteen seconds is just enough to breathe, move to the next station and get set. The table works out common circuits.
Outside training, forty-five seconds sits inside the time the World Health Organization gives for a thorough handwash, from wetting your hands to drying them: 40 to 60 seconds for the whole routine of rubbing palms, backs, fingers and thumbs. It also makes a fair limit for a short answer in a debate or class round, a quick pitch, or giving every player in a game the same time to think. Press + to add a minute if a turn runs long.
- The World Health Organization’s How to Handwash poster gives 40 to 60 seconds for the entire handwashing procedure. Source: World Health Organization, How to Handwash (poster).
Circuits of 45 seconds on, 15 seconds off
Each station takes exactly one minute, so a circuit of N stations takes N minutes a round.
| Stations | 1 round | 2 rounds | 3 rounds | 4 rounds |
|---|---|---|---|---|
| 4 | 4:00 | 8:00 | 12:00 | 16:00 |
| 5 | 5:00 | 10:00 | 15:00 | 20:00 |
| 6 | 6:00 | 12:00 | 18:00 | 24:00 |
| 7 | 7:00 | 14:00 | 21:00 | 28:00 |
| 8 | 8:00 | 16:00 | 24:00 | 32:00 |
| 9 | 9:00 | 18:00 | 27:00 | 36:00 |
| 10 | 10:00 | 20:00 | 30:00 | 40:00 |
| 12 | 12:00 | 24:00 | 36:00 | 48:00 |
45 seconds in other units
| Unit | Value |
|---|---|
| Milliseconds | 45,000 |
| Minutes | 0.75 |
| Share of an hour | 1.25% |
| Times it fits in an hour | 80 |
| Times it fits in a day | 1,920 |
Frequently Asked Questions
What is a 45/15 workout?
45 seconds of an exercise, then 15 seconds of rest before the next one, so each exercise takes one minute. A circuit of 6 exercises is a 6-minute round; repeat it two to four times. Pick moves you can do with good form for the whole 45 seconds.
How long should handwashing take?
The World Health Organization gives 40 to 60 seconds for the whole routine, from wetting your hands to drying them. The CDC asks for at least 20 seconds of scrubbing with soap within that. A 45-second timer covers the full routine at a steady pace.
Can I add time to a 45-second timer while it runs?
Yes. Press + (or the +1 button) to add a minute and − to take one off, without restarting. Reset brings it back to 45 seconds for the next round.