HIIT Interval Timer
Set up repeating interval workouts, sprint routines, and rest cycles. Visual stopwatch cues run entirely offline.
Configure custom rounds, work duration, and recovery cycles offline
How to use this tool
Interval Workouts
High-Intensity Interval Training (HIIT) relies on alternating work and rest phases. A precise interval timer helps you maintain exact round structures for maximum performance.
How to Build a Workout
Define rounds, work sessions, and recovery intervals below.
Configure Sets
Set the number of rounds (sets) and configure the work duration (e.g. 40 seconds).
Define Recovery
Specify the rest interval duration between work sets (e.g. 20 seconds).
Follow Audio Cues
Press play and follow the visual progress rings and local audio countdown cues.
Frequently Asked Questions
Interval structures definitions.
What is a Tabata protocol?
Tabata is a popular HIIT format consisting of 8 rounds of 20 seconds of maximum intensity effort followed by 10 seconds of rest, totaling 4 minutes of intense exercise.
Does this timer require keeping the tab active?
Yes. For highly accurate stopwatch timing offsets, it is recommended to keep this browser tab visible, as browsers throttle javascript execution for background tabs.
Privacy & Safety Policy
All tools run completely in your browser via client-side JavaScript. We do not upload your files, interest parameters, or JSON payloads to any server. Your data remains yours.