45 s / 15 s × 10 Timer

45 s / 15 s × 10 preset: 45 s of work, 15 s of rest, 10 rounds. Press Start (or Space); you can still change the values before starting.

A 45/15 pattern is the format of many group fitness classes: 45 seconds at a station, 15 seconds to move to the next. Ten rounds equal a 10-minute block; three blocks with breaks make a full class.

1. Set work and rest – Type the work and rest time in seconds and the number of rounds, or pick a preset below. Tick “Repeat” for an endless loop.
2. Start – Click Start or press Space. The current phase and round number show above the clock, and a short beep sounds during the last 5 seconds of every phase.
3. Finish – After the last round the alarm chosen in Configure plays. Pause stops the countdown, Reset returns to the settings.

The timer keeps working in a background tab and after a page reload. Sounds are generated in the browser; in Configure you can pick the final alarm, your own file or a YouTube video. Shortcuts: Space start/pause, R reset, F full screen.

Frequently asked questions