4x4 interval timer
4x4 interval timer: four minutes of work, three minutes of rest, four times through. Runs in your browser, free, with no sign-up and no install.
Total 25:10
Warm-up and cool-down
The pattern
- Work
- 4:00
- Intervals
- 1
- Rounds
- 4
- Rest between rounds
- 3:00
- Get ready
- 10 s
- Total
- 25:10
Four blocks of four minutes, each followed by three minutes of rest. One long work phase per round rather than several short ones, so this timer counts rounds where the others count intervals.
A little over twenty-five minutes end to end, countdown included. The timer calls every change, which is the part that matters on a four-minute phase: there is nothing to look at for most of it.
How a run goes
- Press start. A ten-second countdown runs before the first block.
- Four minutes of work. One interval per round, announced at its start and its end.
- Three minutes of rest. The round rest separates one block from the next.
- Four rounds in all. The fourth block ends the session; there is no rest after it.
What this timer does
An interval timer counts work and rest for you so you can stop counting and start moving. Set how long you work, how long you rest, and how many times — the timer handles the rest, calls every change out loud, and shows the whole session as a strip so you always know what is coming.
Time here is measured against the clock, not counted down by a ticker. Put the phone down, pick it up again, and the timer is exactly where it should be rather than a few seconds behind. That sounds like a detail until you have done eight rounds against a timer that drifted.
Every setting travels in the link. Copy the address bar and you have shared your session — no account on either end.
One thing a browser cannot do
When your screen switches off, or you leave this tab, the browser stops the audio. The clock still comes out right when you return, but you will not have heard the beeps in between. We ask the browser to keep the screen awake where it can, and we tell you when it cannot — because a tool that names its limit is more useful than one that hides it.