20 Second Timer
A free 20 seconds countdown timer — perfect for plank holds and short intervals. It starts on its own and rings when time is up.
00:20Ready
minsec
Other timers
10 Second15 Second20 Second30 Second45 Second1 Minute2 Minute3 Minute4 Minute5 Minute6 Minute7 Minute8 Minute10 Minute12 Minute15 Minute20 Minute25 Minute30 Minute40 Minute45 Minute1 Hour90 Minute2 Hour
Need something custom? Use the full online timer, or try the stopwatch to count up instead.
Frequently asked questions
- How do I start the 20 seconds timer?
- It starts automatically when the page opens. Use Pause to stop it and Reset to return it to 20 seconds. You can also change the duration with the presets or the minute and second inputs.
- Will it keep running if I switch tabs?
- Yes. The timer tracks the real elapsed time rather than counting ticks, so it stays accurate even when the tab is in the background.
- Does it make a sound when it finishes?
- Yes, it plays an alarm at zero and the tab title changes to let you know. Make sure your device isn't muted.