45 Minute Timer
A ready-to-start 45-minute countdown. Press Start — the alarm sounds when time is up.
Pre-set to 45 minutes — a class period or a training session. Need a different length? Use the online timer or pick another preset below.
About this tool
This page is a 45-minute timer with nothing to configure: the duration is already set, so starting takes one click. Forty-five minutes is the standard class or lesson period in many schools, the length of a typical coaching session, and a common deep-work block for people who find 25 minutes too short to warm up. Many entrance and certification exams are also sectioned in 45-minute parts.
The countdown runs in this browser tab and also shows in the tab title, so you can get on with other things and glance back. When it reaches zero you will hear an alarm tone and see the “Time's up!” message. Keep the tab open — a browser timer cannot ring from a closed tab — and use Pause or Reset at any point.
How to use it
- Press Start — the timer is already set to 45 minutes.
- Teach, train or focus — the tab title shows the time left.
- The alarm sounds at zero. Press Reset to run it again.
Frequently asked questions
How do I set a 45 minute timer?
You don't need to set anything — this page is pre-set to 45 minutes. Just press Start.
Will the alarm work if I switch to another tab?
Yes, the countdown continues and shows in the tab title; the sound plays as long as this tab stays open somewhere in your browser.
Can I use this as a 45 minute timer with alarm for a class period, a training session or a deep-work block?
Yes — it is a plain countdown with an audible alarm at zero, which works well for a class period, a training session or a deep-work block, and for anything else that takes 45 minutes.