Interval Timer

Free online interval timer for HIIT, Tabata, circuit training, and boxing. Set your work time, rest time, and rounds β€” the timer handles all the switching automatically.

Quick Presets

Total: 4:00  Β·  Work: 20s Β· Rest: 10s

Ready
00:20
Round 1 / 8
Ready to start

Press Space to start / pause

How to Use the Online Interval Timer

1

Configure Your Set

Enter your work and rest durations in seconds. Use the quick presets for Tabata (20/10) or Boxing (180/60) to save time.

2

Start Training

Hit Start and follow the visual ring. Green indicates the work phase, while amber marks your recovery period.

3

Listen for Bleeps

Distinct audio cues signal the end of each interval, allowing you to focus on your workout without looking at the screen.

Why Use an Interval Timer?

Removes Distractions

Automated switching means no fumbling with your phone or watch between sets, keeping your intensity levels high.

Precision Training

Exact work-to-rest ratios ensure you're training at the intended intensity, whether it's aerobic endurance or anaerobic power.

Versatile Application

Perfect for HIIT, Tabata, circuit training, boxing rounds, and even productivity sprints like the Pomodoro technique.

Best Sports & Activities for Interval Training

⚑
Tabata
20s / 10s Γ— 8
Max effort, 4 min total
πŸƒ
HIIT Running
30s / 15s Γ— 12
Sprint, walk, repeat
πŸ₯Š
Boxing Rounds
3 min / 1 min Γ— 6
Standard round format
πŸ’ͺ
Circuit Training
45s / 15s Γ— 6
Full-body station work
πŸͺ’
Jump Rope
60s / 30s Γ— 8
Cardio + coordination
🚣
Rowing
40s / 20s Γ— 10
Full-body power bursts
🌱
Beginner HIIT
30s / 60s Γ— 8
1:2 ratio β€” start here
πŸ…
Pomodoro Focus
25 min / 5 min Γ— 4
Productivity intervals
Share: Facebook X WhatsApp LinkedIn Reddit

Reasons why an Interval Timer is the Most helpful Fitness Tool You Are Using Wrong.

The majority of individuals who exercise manually will restart their stopwatch between sets, will always look at the phone or simply forget the number of rounds. All three problems are solved with the help of an interval timer. You set your work time, rest time and number of rounds once and the timer automatically changes the phases and counts your rounds. Your all your mind concentrates on the work-out and not on the timing.

The physics behind interval training is proven: the alternation of the high-intensity effort and the organized rest trains your cardiovascular system more than the steady-state training in significantly fewer durations. A work/rest ratio of 2:1 (such as the 20 seconds on, 10 seconds off model of Tabata) maintains your heart rate high using the recovery phase but partial recovery. This causes a metabolic requirement that persists to use up calories even 48 hours after the exercise has ceased, a condition that has been known as excess post-exercise oxygen consumption or EPOC.

Selecting the Appropriate Work-to-Rest Ratio.

The most important variable in interval training is your work to rest ratio. The proper proportion is 1:2 (20 seconds of work, 40 seconds of rest), which is suitable to novice or for any exercise that needs special technique the extended rest will give your body time to restore itself so that every work period is done correctly. Intermediate fitness levels are normally achieved on a 1:1 ratio (30 seconds each). The 2:1 ratio (40/20) is progressive and generates the highest metabolism stimulus - however do not ever attempt to go beyond the intensity ratios that you are physically fit to perform. The ratio does not matter as much as the quality of work in each work period does.

Exercise out of the gym interval training.

Fitness is not the only use of interval timers. The Pomodoro productivity technique (25 minutes of its work, 5 minutes of rest), speech timing during the debate, practicing music, language learning sprints also use the same structure of work/rest. In the case of the strict 20/10x8 Tabata protocol, our Tabata Timer will run the Tabata automatically with counting. To have a cardiovascular HIIT workout with directions on warm-up and cool-down, use HIIT Timer. The Pomodoro Timer is your friend in case you want to organize the focus sessions, with automatic breaks.

Interval Timer – Free Online Workout Countdown Clock

Related Timer Tools

Frequently Asked Questions

What is the function of the interval timer?

Select a preset (Tabata, HIIT, Circuit, etc.) or key in your own work time, rest time and rounds. Clicking the Apply Custom Settings option will require custom values, and then press Start. There is a timer, which will automatically switch to a green work phase and an amber rest phase and counts your rounds in the process.

What does the ring color mean?

Green ring = work phase. Amber ring = rest phase. The time has a WORK / REST badge that also makes it clear. When any phase is nearing 3 seconds to completion, the ring becomes red and a count down beep sounds to indicate that a switch is about to occur.

Why is this any different than the Tabata Timer?

This time-out timer is all-purpose - you can program any work/rest/rounds ratio to any activity. The Tabata Timer is designed to work with the Tabata Protocol that is 20s/10sx8 with set counting and a Tabata countdown that counts the preparation time.

Which number of rounds should be used by beginners?

Begin with 4-6 rounds with the Beginner HIIT preset (30s work / 60s rest). Emphasise intensity during each work bouts instead of doing all rounds. You can add rounds once every week or two when you are getting fit. Always remember that bulk should not take the place of form.

Is this interval timer free?

Yes, completely free. No account, no download into an app, no subscription. Browse by using any browser be it on desktop, tablet or mobile. Arrange your work/rest/rounds and begin training right now.