radialtimers.com
This timer draws 45 minutes as 20 concentric rings; one empties every 2.3 minutes, so a glance shows how far along you are without reading a digit. It chimes at zero, keeps counting in a background tab, runs fullscreen, and exports as a free MP4 video. Handy for a deep-work block, roasting vegetables, or a standard class period.
Forty-five minutes is the length of a school period, a football half, a proper deep-work block, and a tray of roasted vegetables. It is three quarters of an hour and the first duration where a task really needs an end drawn for it. Each ring on the dial is two minutes and a quarter; four rings make nine minutes, and ring ten is twenty-two and a half.
Many school timetables run on forty-five-minute periods, and teachers have always paced them by feel. Fullscreen this dial on the board and the pacing is shared: the class can see the first quarter gone, the halfway mark, the last five rings. The classroom page is a five-minute version for transitions; this is the whole lesson in one sweep.
Forty-five minutes is long enough to get properly inside a problem and short enough to stay honest. Start the dial, close everything that is not the task, and stop at the chime even if you are mid-flow; the stop is what makes the next block easy to start. The detox page runs four of these blocks with a five-minute check-in between, for anyone who wants the phone kept away for a whole morning.
Root vegetables cut into chunks, potatoes, carrots, parsnips, squash, roast in forty to fifty minutes at a hot oven, turned once. Forty-five is the middle, and ring ten is when to turn them. At the chime they should be browned at the edges and soft through; if not, five more minutes on a fresh dial.
A football match is two halves of forty-five minutes plus whatever the referee adds. For a training game or a kickabout with proper halves, put the dial on a phone by the pitch and let the chime blow the whistle. The 90 minute dial runs both halves on one face.
Forty-five is three quarter-hours with the switches at rings seven and thirteen (roughly). A revision session can run three topics that way, and a workout can run warm-up, main set, and cool-down as thirds. The 15 minute dial restarted three times gives a chime at each change.
The 40 minute dial and the 50 minute dial sit either side. A forty-five-minute video is on the card, and every length is on the timers page.
2.3 minutes. The dial always has 20 rings, and this timer runs 45 minutes.
Yes. The nearest pages are the 30 minute timer and the 1 hour timer, and the custom field on any dial takes an exact length.
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.