Interval Timer (HIIT and Tabata)

Run work and rest intervals for HIIT, Tabata or circuits, with beeps at each change.

Work — round 1 of 8

00:20

Workout

Preset

Work (s)

Rest (s)

Rounds

Warm-up (s)

Total: 03:50

Beep at each change

Runs in your browser — nothing you enter is sent to a server.

How the Interval Timer (HIIT and Tabata) works

Choose a preset or set your own work and rest times, number of rounds and an optional warm-up. The timer runs through each phase, beeps at every change, shows the round and time left in large type and in the tab title, and keeps accurate time even if the tab is in the background.

Formula

warm-up + rounds × work + (rounds − 1) × rest

There's no rest after the last round.

Examples

Tabata

8 rounds of 20 s work and 10 s rest take 230 seconds — 3 min 50 s; with a 60 s warm-up, 4 min 50 s.

EMOM

Every minute on the minute: 10 rounds of 60 s with no rest between.

Frequently asked questions

Will it beep with the screen locked?

Browsers may pause pages on a locked phone; keep the screen on during workouts.

Can I pause?

Yes — pause and resume at any point without losing your place.

What is Tabata?

A high-intensity protocol of 8 rounds of 20 seconds all-out effort and 10 seconds rest. Check with a doctor before starting hard exercise.

Stopwatch

Time anything to a tenth of a second and record laps, with the fastest and slowest marked.

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Countdown Timer

Count down from any time up to 99 hours, with quick presets and a beep when time is up.