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Interval Timer

A one-tap countdown timer for rest between sets, with a beep when time is up. It also includes a Pomodoro mode for focused work.

Choose a mode and duration
Interval
01:30
Runs entirely on your device — nothing is sent anywhere
A beep sounds when time is up. If your device is muted you may not hear it. Some browsers pause countdowns when the screen turns off, so keep the screen on while timing.
How to use the Interval Timer

Timing your rest between sets accurately has a big impact on training quality. Resting by feel usually means resting too long — while resting too little means you can’t handle enough weight on the next set. This tool is a countdown timer for the rest durations recommended by the Interval Calculator.

How to use this tool

Pick a preset (30 seconds to 3 minutes) or enter a custom duration, then press Start. The remaining time also appears in the browser-tab title, so you can see progress even from another tab. A beep sounds when the timer finishes.

About the Pomodoro mode

The Pomodoro Technique is a time-management method that repeats 25 minutes of focused work plus a 5-minute break, with a longer break (15 minutes) every 4 rounds. It is widely used for studying and desk work. Switch modes and the timer cycles through work and breaks automatically.

Tips

For heavy strength training, rest 3–5 minutes between sets; for hypertrophy, 60–120 seconds is typical (see the Interval Calculator). Starting the timer the moment you finish a set keeps your whole session consistent. You can also track your workouts with the Joy Next World Gym App.

Glossary & FAQ
What is an interval timer?
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A countdown timer for measuring the rest between sets in weight training.

The optimal rest length differs by goal (strength, hypertrophy, endurance), so timing it precisely rather than by feel is recommended. See the Interval Calculator for goal-based recommendations.
What is the Pomodoro Technique?
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A time-management method that repeats 25 minutes of focused work plus a 5-minute break as one round (one "Pomodoro"), devised by Francesco Cirillo in the 1980s.

Every 4 rounds you take a longer 15–30 minute break. The Pomodoro mode here cycles 25 min → 5 min → … → a 15-minute break after the 4th round, automatically.
I can’t hear the beep. What should I do?
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Check that your device is not muted.

Browsers also block audio until you interact with the page at least once. As long as you press the Start button first, the beep normally plays.
Does the timer keep running when the screen is off?
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Depending on your browser and power-saving settings, background countdowns may lag or pause.

If you need precise timing, keep the screen on, or use your device’s clock app alongside.
Is anything I enter sent anywhere?
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No. This tool runs entirely in your browser (client-side); no settings or usage data are sent to any server.
References
・Schoenfeld BJ, et al. (2016). Longer Interset Rest Periods Enhance Muscle Strength and Hypertrophy in Resistance-Trained Men. Journal of Strength and Conditioning Research, 30(7), 1805–1812.
・de Salles BF, et al. (2009). Rest interval between sets in strength training. Sports Medicine, 39(9), 765–777.
・Cirillo, F. (2018). The Pomodoro Technique. Currency.
Please note
Timer accuracy depends on your browser and device (power-saving settings, background behavior). For uses that require precise timing, such as competition or medical settings, use dedicated equipment. Always train within your physical limits.

Track Your Workouts in the App

Log weights, reps and menus — Joy Next World Gym App is free to use.

Try the App →