oTimers.com
45 min

45 Minute Visual Countdown Timer

A free 45-minute visual timer with circular radial sweep. Calibrated for standard university lectures, high-school class periods, and deep study blocks.

Common Uses for a 45-Minute Timer

How to Use This 45-Minute Timer

  1. Instant Start: The timer is already set to 45 minutes (2700 seconds). Simply tap Space or click START.
  2. Visual Sweep: Watch the smooth circular arc deplete in real time to gauge your pacing at a single glance.
  3. Acoustic Alert: When 45 minutes have elapsed, a peaceful Tibetan singing bowl chime will ring out.
  4. Floating Window: Click P to pop the countdown into an always-on-top picture-in-picture window while working in other apps.

Other Popular Countdown Durations

1m 1 Minute Timer 2m 2 Minute Timer 3m 3 Minute Timer 4m 4 Minute Timer 5m 5 Minute Timer 6m 6 Minute Timer 7m 7 Minute Timer 8m 8 Minute Timer 9m 9 Minute Timer 10m 10 Minute Timer 15m 15 Minute Timer 20m 20 Minute Timer 25m 25 Minute Timer 30m 30 Minute Timer 1h 60 Minute Timer

Frequently Asked Questions

Will this 45-minute timer work if I switch tabs?

Yes. oTimers calculates elapsed time using high-resolution hardware timestamps (performance.now()). Even if your browser throttles background tabs, the countdown remains 100% accurate down to the millisecond.

Can I adjust the time while it's running?

Yes. Press ↑ or ↓ on your keyboard (or scroll your mouse wheel over the watch face) to add or subtract minutes on the fly without stopping the clock.

What sound will play when 45 minutes are up?

Instead of abrasive digital buzzer sounds, oTimers synthesizes an acoustic Tibetan singing bowl / Zen gong using the browser's native Web Audio API.