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25 Minute Timer
Your 25:00 countdown is set: press Start (or Space) and the alarm rings after twenty-five minutes. That is one classic Pomodoro, a great block for studying, writing or any task you keep putting off.
25:00
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?m=15 to the address for a custom length. Keep this tab open; the countdown stays accurate in the background.
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How to use the 25 Minute Timer
- Press Start or hit the Space bar. The 25:00 countdown begins immediately.
- Want a reminder midway? Tick Soft chime at the halfway mark to hear a gentle chime at 12:30 left.
- Fine-tune the length with the ± buttons or pick another preset.
- Choose an alarm sound and volume, then press Play test sound to check you can hear it.
- When time is up, press Stop alarm or Space. Press R to reset to 25:00.
How long is 25 minute?
| Measure | 25 Minute equals |
|---|---|
| Minutes | 25 min |
| Seconds | 1,500 s |
| Milliseconds | 1,500,000 ms |
| Hours | 0.4167 h |
| Share of a day | 1.74% of a day |
| Walking at 5 km/h (3.1 mph) | about 2.1 km (1.3 mi) |
| Speaking at 130 words per minute | about 3,250 words |
| Reading at 230 words per minute | about 5,750 words |
What you can do in 25 minute
| Activity | Why 25 minute works |
|---|---|
| Pomodoro | The original technique uses 25 minutes of focus followed by a 5 minute break |
| Study session | Long enough to make progress, short enough to stay sharp |
| Cake or brownies | Many brownie and cake recipes bake in 20 to 30 minutes |
| Run or bike ride | A comfortable short cardio session |
| Meeting slot | Calendar tools often offer 25 minute meetings to leave a buffer |
| Reading | About 5,750 words at 230 words per minute |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 1,500,000 ms on the browser's monotonic clock (performance.now()). Every screen update subtracts the current time from that end moment instead of counting ticks, so a throttled background tab or a busy computer cannot make it fall behind. Pausing stores the time left, and Resume sets a new end moment that far in the future.
Frequently asked questions
How do I set a timer for 25 minutes?
The timer opens at 25:00. Press Start or the Space bar; the alarm sounds at 0:00 until you stop it.
How many seconds are in 25 minutes?
25 minutes is 1,500 seconds or 1,500,000 milliseconds, about 0.417 hours.
Why 25 minutes?
It is the work interval of the Pomodoro Technique, created by Francesco Cirillo: 25 minutes of focus, then a 5 minute break, with a longer break after four rounds. Our Pomodoro timer automates the cycle.
When does the halfway chime play?
When switched on, it plays once at 12:30 left.
Can I pause the timer?
Yes. Press Pause or Space, then Resume to continue from the same time. R resets it to 25:00.
Does it keep running in the background?
Yes. The countdown is based on the clock, so it stays accurate in a background tab. Keep the tab open and the computer awake.
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