30 Second Timer
Free shareable timer - copy the link and anyone can start counting down instantly.
Why a 30 second timer?
Thirty seconds is the shortest interval most people can hold a deliberate effort without pacing themselves. That makes it the default unit for high-intensity work: it is long enough to be genuinely hard, short enough that you can repeat it a dozen times in a single session.
It is also the interval dentists build into brushing advice. The two minutes the American Dental Association recommends is usually taught as four 30-second blocks, one per quadrant of the mouth, because almost nobody divides their attention evenly without a prompt.
What people use a 30 second timer for
- Plank and hollow holds. Thirty seconds is the standard entry point for a plank progression - hold, rest, repeat, then add time once you can complete all sets with a flat back.
- Sprint and bike intervals. A 30-second all-out effort followed by a longer recovery is the backbone of most anaerobic conditioning sessions.
- One quadrant of toothbrushing. Four 30-second blocks add up to the two minutes dentists ask for, and the timer stops you short-changing the back teeth.
- Quick-fire classroom rounds. Short enough to keep a whole class engaged for a rapid answer round without anyone losing the thread.
- Speed drills and reaction work. Anything scored by volume - reps, words written, cards sorted - benefits from a fixed short window.
Other preset timer lengths
Frequently Asked Questions
Is 30 seconds long enough to be a real plank set?
For a beginner, yes. Most strength coaches treat a clean 30-second hold as the point at which you start adding sets rather than seconds. Form failing before the buzzer matters more than the number on the clock.
Why do dentists talk about 30 seconds?
Because two minutes of brushing is hard to divide evenly by feel. Splitting the mouth into four quadrants and giving each one a timed 30 seconds is the standard way to make the full two minutes actually happen.
Can I share this link with my class?
Yes - just copy the link from the box above and paste it into your LMS, email, or messaging app. When students open it they get a 30s timer that's ready to start with one tap. No account or download needed.
Does the timer save my progress?
The timer runs entirely in your browser - progress is not saved between page loads. If you refresh or close the tab the timer resets to 30s. For a timer that auto-starts when someone opens the link, add ?autostart=1 to the URL or use the shareable timer generator.
Can I add a label to my timer?
Absolutely. Add a ?label= parameter to the URL - for example https://stopwatch.now/timer-link/30s?label=Math+Quiz. The label appears above the countdown. You can also use the timer link generator to build a labelled timer link without editing URLs by hand.
Can I make the timer auto-start when someone opens the link?
Yes. Add ?autostart=1 to the URL. For example: https://stopwatch.now/timer-link/30s?autostart=1. The timer will begin counting down the moment the page loads - no click required.