Pomodoro Timer
Focus
25:00
How to use this Pomodoro timer
- Set your focus and break durations, or keep the defaults (25/5).
- Click "Start" to begin a focus session.
- The timer automatically switches between focus and break cycles.
What is the Pomodoro Technique?
A time management method where you work in focused intervals (traditionally 25 minutes) followed by short breaks, helping maintain concentration and avoid burnout.
Why 25 minutes specifically?
25 minutes was the original interval chosen by the technique's creator, Francesco Cirillo, in the late 1980s — short enough to maintain focus, long enough to make real progress. Feel free to adjust it to what works for you.
Does the timer keep running if I close the tab?
No — the timer only runs while the tab is open. Keep it open in the background if you want it to keep counting.
The psychological mechanism behind why it works
The Pomodoro Technique works with a well-documented feature of sustained attention: focus and willpower behave like a depletable resource that degrades with continuous use, producing diminishing returns the longer an uninterrupted work session runs. Forcing a break at a fixed interval, before that decline sets in fully, means each new focus session starts from a comparatively restored state rather than continuing to draw down an already-depleted one. This is also loosely connected to the (more contested) idea of ultradian rhythms — natural cycles of alertness across roughly 90-120 minutes — though the technique's actual effectiveness doesn't depend on that specific theory being correct; the core mechanism is simply that scheduled recovery periods sustain better average focus than treating a work session as one long, uninterrupted push.
Why the ratio matters more than the exact numbers
25 minutes of focus and 5 minutes of break is one specific implementation of a broader principle: a roughly 5-to-1 ratio between focused work and recovery time. This exact ratio isn't a universal law — some people and some types of task benefit from longer blocks at the same ratio (50 minutes focus, 10 minutes break) for deep, hard-to-re-enter work like writing or programming, while shorter cycles can suit fragmented, interruption-prone environments better. What matters more than hitting 25 and 5 exactly is maintaining some consistent ratio between focus and recovery, rather than working in unstructured stretches with no scheduled break at all, which is the actual habit the technique is designed to replace.
The "long break every fourth cycle" rule most people miss
Francesco Cirillo's original technique includes a detail that often gets lost when people simplify it down to just "25 minutes on, 5 minutes off": after completing four focus/break cycles, the recommendation is a longer break of 15 to 30 minutes, not another short 5-minute one. This longer break exists because the short breaks between individual pomodoros aren't enough to prevent fatigue building up across an entire day of repeated cycles — the longer break is what actually resets accumulated mental fatigue rather than just the fatigue from one single session. A simple two-state timer that only alternates between one focus length and one break length, without this longer periodic reset, is missing a meaningful part of the original method's design.
Common mistakes: interrupting a session instead of ending it
The original technique treats an interruption during a focus session as a specific, disciplined event, not something to just pause through: if something genuinely urgent breaks your concentration, the rule is to end that pomodoro entirely (recording it as an incomplete one) rather than pausing the timer and resuming later, since resuming mid-session undermines the whole point of a fixed, uninterrupted block. In practice, most people who use the technique loosely just pause and resume, which works fine as a general focus aid but isn't quite the disciplined method Cirillo actually designed — worth knowing if you want the technique in its stricter, more rigorous original form rather than a general timer with a nice name.
Limitations of this tool
This timer implements the basic two-state cycle (focus, then break, repeating) with adjustable durations — it doesn't implement the longer break after every fourth cycle that the original technique specifies, doesn't track or log completed pomodoros or interruptions the way Cirillo's original paper-based method did, and stops entirely if you close the browser tab, since it has no way to keep running in the background once the page itself is gone. For the full original method with cycle counting and long-break scheduling, or for persistent tracking across a workday, a dedicated Pomodoro app built around the complete technique will serve you more thoroughly than this straightforward timer.