15 Second TimerFree Online Countdown
Set a timer for 15 seconds with a loud alarm. Pause, add a minute, share the link.
Set time
Quick timers
Keep this tab open with volume on. Tap Test sound once to allow audio.
Online 15 second timer
This page gives you a free online 15 second timer. The time is already set to 15 seconds, so just tap Start Timer, keep the tab open and a loud alarm rings when 15 seconds are up.
A 15 seconds countdown is popular for rest between sets, breathing exercise and brushing and handwash. You can pause, add one more minute or restart at any time.
Popular uses for a 15 seconds timer
Rest between sets
Keep rest periods short and consistent at the gym.
Breathing exercise
A quick box-breathing or calm-down round.
Brushing and handwash
Time it so you do the full recommended duration.
Plank or wall sit
Hold the position until the alarm rings.
15 seconds in other units
How to use the 15 second timer
- 1Check that the timer shows 15 seconds, or change hours, minutes and seconds.
- 2Tap Start Timer and allow notifications when your browser asks.
- 3Watch the ring count down. Pause, resume or tap +1 min whenever you need.
- 4When 15 seconds are over, a loud alarm rings. Tap Stop alarm or restart the same timer.
Other timers like 15 seconds
15 second timer FAQ
How do I set a timer for 15 seconds?
The 15 second timer is already selected on this page. Tap Start Timer, allow notifications if asked, and keep the tab open with your volume up. You will hear a loud alarm when 15 seconds have passed.
How many seconds, minutes and hours is 15 seconds?
15 seconds equals 15 seconds, 0.25 minutes or 0 hours.
Will the 15 second timer keep running if I close the tab?
No, the tab must stay open for the alarm to play. You can switch to other tabs or apps, and the timer keeps its end time even if you refresh the page.
Can I pause or add time to the 15 second timer?
Yes. Use the Pause button to stop the countdown and Resume to continue. Tap +1 min to extend a running timer, or Reset to start over.
Does the 15 seconds timer work on iPhone and Android?
Yes. It works in Safari, Chrome, Edge and Firefox on iPhone, Android, Windows and macOS. It is free and needs no app or signup.