radialtimers.com
Five minutes on the board for cleanup, silent reading, or station rotations. Project it fullscreen and the rings tell the whole class how long is left without anyone asking.
A classroom timer has one job: to answer "how long do we have?" without the teacher having to. This page is five minutes drawn as 20 rings, one going every 15 seconds, so from the back row a student sees "about half" or "nearly done" instead of squinting at digits. Fullscreen it on the projector or smartboard with the f key and the display is the dial and the time, nothing else to read.
| Routine | Length | Timer |
|---|---|---|
| Pack-up and chairs on desks | 2 minutes | 2 minute timer |
| Do-now or warm-up question | 5 minutes | this page |
| Silent reading | 10 minutes | 10 minute timer |
| Group task before a share-out | 15 minutes | 15 minute timer |
| Timed writing | 20 minutes | 20 minute timer |
For rotations, build the whole lesson as one Cycle: open Cycles, add a block per station with its length, and a short block between for moving. Each change chimes, so the room turns over without a raised voice, and the current block always shows on the dial. For a 45 minute period with four stations, that is four blocks of 9 minutes with 2 minutes of transition, plus 1 minute at the end for tidying. If two groups need different lengths, run two timers side by side; each has its own dial and chime.
A Room shares one countdown to every device that opens its link, which suits a class on laptops or a co-teaching setup with two screens. The picture-in-picture popout floats a small dial over slides when the projector is busy with the lesson.
Transitions for younger classes are better at two or three minutes, and a long task with a clear end wants a longer dial so the rings do not feel frantic. The guide on visual timers for classrooms walks through lesson shapes by age.
Yes. Fullscreen it and the dial scales to the screen; the rings read from the back of the room.
Yes. Open several timers side by side for stations, each with its own dial and chime.
Add it as a browser source in OBS; the background stays transparent. Change t for any length.
A radial timer is a free online countdown timer you set in one click: pick a length, press Start, and an alarm sounds at zero. Run several timers at once, take one fullscreen, or pop one out picture-in-picture to float over other apps. Every timer keeps counting in a background tab, and any timer exports as a video. No download, no sign-up.
Its dial draws the countdown as 20 concentric rings, one for each twentieth of the duration. Rings empty one by one, outermost first, so a glance shows how far along you are without reading a digit.
Yes. The countdown follows the clock, so it stays on time while you work in another tab and still chimes at zero. The picture-in-picture popout keeps a small dial in view the whole way.
Yes. Any timer exports as an MP4 or a transparent WebM of the whole countdown, up to 4K and 60 fps, in 16:9, vertical, or square.
Yes. In OBS, add a browser source pointing at radialtimers.com/overlay?t=25m and a transparent dial counts down over your scene. Change t for any length, like 90s or 3h.
As many as you need. Each timer gets its own dial and runs on its own, which suits interval workouts, several dishes on the stove, or a room of activity stations.