What is the correct Tabata work-to-rest ratio?

The original Tabata protocol uses 20 seconds of maximal effort followed by exactly 10 seconds of rest, repeated for 8 rounds. This 2:1 ratio is non-negotiable in the classical protocol — altering it produces a different stimulus and should be classified as a modified Tabata or generic HIIT interval.

How many calories does a Tabata workout burn?

A single four-minute Tabata block burns roughly 13–15 calories during the work itself, but the afterburn effect (EPOC) can elevate your metabolic rate for up to 30 minutes post-exercise, bringing total expenditure to 50–100 calories depending on your body weight and effort level.

Can beginners do Tabata training?

Tabata requires you to work at near-maximal intensity, so it is not recommended for complete beginners or those with cardiovascular conditions. New exercisers should build a 4–6 week base of moderate-intensity cardio before attempting Tabata, and should start with lower-impact movements like step jacks instead of burpees.

How many Tabata blocks should I do per workout?

Research and coaching practice both suggest 3–5 Tabata blocks per session, each targeting a different muscle group or movement pattern, with 1–2 minutes of rest between blocks. This produces a total workout of 16–28 minutes that is both effective and manageable without excessive fatigue.

Tabata Timer

Free Tabata timer with 20 seconds work and 10 seconds rest for 8 rounds. Classic Tabata protocol used by athletes and fitness enthusiasts worldwide. No download needed.

Work

Rest

Rounds

Tabata training originates from a 1996 study by Japanese researcher Dr. Izumi Tabata, who demonstrated that four minutes of high-intensity cycling — alternating 20 seconds of all-out effort with 10 seconds of rest across eight rounds — produced greater improvements in both aerobic and anaerobic capacity than an hour of moderate-intensity steady-state exercise. The protocol's power lies in its brevity and intensity: the 2:1 work-to-rest ratio keeps your heart rate elevated throughout, triggering excess post-exercise oxygen consumption (EPOC) that continues burning calories long after the workout ends. Ideal movements for Tabata include bodyweight exercises like squats, burpees, push-ups, and mountain climbers, as well as kettlebell swings and sprint intervals. Because the eight rounds are completed in exactly four minutes, Tabata is the most time-efficient high-intensity protocol in widespread use. Multiple Tabata blocks can be stacked with two-minute rest periods between them for a complete 20–30 minute training session.

Free Online Interval Timer

Zolkit's interval timer runs entirely in your browser — no app to install, no account required. Set any work and rest duration, choose a round count, and start training immediately. Built-in presets cover the most popular protocols: Tabata, HIIT, AMRAP, EMOM, boxing rounds, circuit training, the 7-minute workout, and stretching. Audio cues signal every phase transition so you can keep your eyes on your form, not the screen.

Precise Interval Timing

Accurate to the second with clear audio cues at every work-rest transition. Keeps you focused on training, not clock-watching.

8 Built-In Workout Presets

One-click presets for Tabata, HIIT, AMRAP, EMOM, boxing rounds, circuit training, the 7-minute workout, and stretching — loaded and ready to start.

Fully Customizable Intervals

Set any work duration, rest duration, and round count. Save up to 5 custom presets with your own names for instant access on future sessions.

Audio Phase Cues

Distinct audio tones signal the start of work, the start of rest, and the final round complete. Mute toggle for silent environments.

Works on Any Device

Fully responsive on smartphones, tablets, and desktops. Use it propped up in the gym or on a laptop at home — no installation required.

Completely Free

No subscription, no ads mid-workout, no paywalled presets. All features are available to every user with no account needed.

How to Use the Interval Timer

1
Choose a preset workout (Tabata, HIIT, boxing rounds, etc.) or set your own work time, rest time, and round count using the custom fields. Your settings are saved between sessions.
2
Click Start. The timer counts down the work interval with a color indicator, then automatically switches to the rest period with an audio cue. Round progress is displayed throughout.
3
The timer advances through all rounds automatically. When the final round is complete, a finish sound plays and your total workout is done. Use the Reset button to run it again or adjust your settings.