HIIT Interval Timer — Work / Rest / Rounds with Prepare Phase
Build HIIT and circuit workouts: configurable prepare, work and rest phases, round count, big color-phase display and phase-change beeps. Free.
How to use this tool
- 1
Set prepare, work and rest seconds, and how many rounds.
- 2
Press Start — the display turns amber (prepare), green (work), red (rest).
- 3
Beeps mark every phase change so you never have to watch the screen.
- 4
Finish the last round, rest, and go again.
Frequently asked questions
▸What can I configure?
The prepare countdown (0–60s), work phase (5–600s), rest phase (0–600s) and the number of rounds (1–30). The display changes color per phase so you can glance at it mid-burpee: amber for prepare, green for work, red for rest.
▸Is this good for EMOM or Tabata?
Yes — set work and rest to split a minute for EMOM-style training. For the classic 20s/10s/8-rounds protocol there is also a dedicated Tabata preset page built on the same engine.
▸Will I hear it across the room?
The chime and the phase-change beeps are generated by your browser's audio engine at full volume — no external files, and they keep firing accurately from background tabs.