Free Online Tabata Timer
Classic 20-second work, 10-second rest, and eight rounds—ready to customize.
The classic four-minute structure
The classic Tabata structure contains 20 seconds of work followed by 10 seconds of recovery, repeated for eight active rounds. That produces four minutes across the complete 20/10 cycle. This Tabata timer loads those exact values by default and shows all eight rounds as a progress row.
The word “Tabata” is often used more loosely for any 20/10-style interval session. A modified timer can be useful, but changing the duration, recovery, or round count means it should not be represented as identical to the specific classic research protocol. The controls remain editable so the tool can still serve a schedule you have chosen.
Run the 20/10 sequence
Set preparation time, check that work reads 20 seconds, rest reads 10 seconds, and rounds reads eight. Start the Tabata timer and use the large phase label or audio signals to follow each switch. Pause preserves the remaining fraction of the current phase; skip moves directly to the next phase.
The ten-second recovery window passes quickly. Prepare any equipment and make the space clear before starting. The progress visualization shows completed and remaining rounds without requiring you to count the repetitions yourself.
Tabata and general HIIT are not interchangeable labels
A general HIIT timer supports many interval ratios and session lengths. The classic Tabata timer highlights one particular 20/10 × 8 schedule. Use the broader HIIT tool when you want 30/30, 40/20, 45/15, or another structure.
Custom timing on this page does not carry a special performance promise. It is simply a convenient way to retain the Tabata timer display while adjusting a phase for an existing plan. High-intensity activity may not be suitable for everyone; stop if you cannot continue safely and seek appropriate professional guidance when needed.
Understand the last recovery window
The four-minute indicator includes all eight 30-second cycles: each contains 20 seconds active and 10 seconds recovery. For that reason, the classic timeline ends after the eighth recovery window rather than stopping at 3:50. The preparation countdown is displayed separately and is not included in the four-minute protocol total.
Round progress is intentionally compact. Each marker advances with the current active round, while the written round count remains available to screen readers and users who do not distinguish the accent colors. Turning off countdown sounds does not remove the WORK and REST labels, and turning off all sound does not change timer progression.
Frequently Asked Questions
Practical answers about how this timer format works.
Is a classic Tabata timer 20 seconds work and 10 seconds rest?
Yes. The classic timing alternates 20 seconds active with 10 seconds recovery.
How many rounds are in a classic Tabata timer?
Eight work rounds and their associated recovery windows make the familiar four-minute sequence.
Can I change the 20/10 timing?
Yes. The fields are editable, but a changed schedule should be described as a custom interval rather than treated as identical to the classic protocol.
Why does the timer show four minutes?
Eight cycles of 20 seconds work plus 10 seconds recovery total 240 seconds, or four minutes.
Is Tabata the same as every HIIT workout?
No. Tabata is a specific interval structure, while HIIT is a broader category with many possible timings.
Timing examples explain the tool and are not medical advice or a personalized training plan. Read the full disclaimer.