# Pomodoro Timer

> A Pomodoro timer with 25/5/15 defaults. Focus, short break, long break, and session counter. Customizable phase lengths.

URL: https://uttir.com/pomodoro-timer
Categories: date-time-tools, calculators
Privacy: Timer runs in your browser. No tracking.

## About

The Pomodoro Technique is a time-management method: 25 minutes of focused work, then a 5-minute break. After 4 work sessions, take a longer 15-minute break. The breaks are essential — they are what keep you from burning out, not a reward.

Start the timer, work until it chimes, take a break, and repeat. The session counter shows your progress through the cycle. Adjust the phase lengths to fit your work style — some people prefer 50/10, others 90/20.

## How to use

1. **Start the focus phase** — Press Start to begin a 25-minute focus block.
2. **Take the break** — When the timer ends, the next phase starts automatically. Take the break.
3. **Repeat** — After 4 focus sessions, the tool gives you a longer 15-minute break.

## Examples

### A classic 4-pomodoro morning

2 hours of focused work with three 5-minute breaks and one 15-minute break.

Output:

```
Focus → Short → Focus → Short → Focus → Short → Focus → Long
```

## FAQ

### Why 25 minutes?

It is short enough to stay focused, long enough to make real progress on most tasks, and the break rewards your attention. Research on ultradian rhythms suggests the brain naturally cycles through ~90-minute focused blocks, and 25 minutes is a comfortably small unit within that.

### Can I customize the phase lengths?

Yes. Use the settings to set your own focus, short break, and long break durations. The defaults (25/5/15) work for most people, but a 50/10 or 90/20 setup is also popular.

### Does the timer keep running in the background?

Yes. The timer is based on performance.now() and runs even when the tab is not active. You can switch tabs or lock the screen and the current phase will still end on time, with a sound notification.

## Related tools

- [Stopwatch](https://uttir.com/stopwatch) — A clean online stopwatch with laps, millisecond precision, and keyboard shortcuts. Runs in your browser.
- [Countdown Timer](https://uttir.com/countdown-timer) — Count down to a specific date and time. Set a target, watch the days/hours/minutes/seconds tick down live.
- [Reading Time Calculator](https://uttir.com/reading-time) — Estimate how long it takes to read or speak a piece of text. Adjustable words-per-minute for fiction, non-fiction, or speech.

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For the full HTML page with the live tool, visit https://uttir.com/pomodoro-timer.
This file is the markdown rendering at https://uttir.com/pomodoro-timer.md. See https://uttir.com/llms.txt for a site-wide summary.