Custom Interval Timer Online
Build your own workout flow with this free custom interval timer online. Create multiple workout blocks, set active and rest durations, arrange the order, and run a custom interval timer directly in your browser for HIIT, circuit training, boxing rounds, and structured training plans.
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Need Saved Timers and Group Names?
Download the app if you want to save your custom interval timers, give each group a name, and hear group names announced during the workout. It is also a better fit when you want reusable routines and more reliable timing in the background.
How To Use This Custom Interval Timer
Add your workout blocks, fill in the timing for each one, then review the total routine before you start. The timer runs directly in your browser and supports sound and notification cues while training.
1. Add your blocks
Create as many workout blocks as you need for warm-up, work sets, rest phases, cooldowns, or skill drills.
2. Set each interval
Choose active time, rest time, and repeats for every block so the timer matches your routine exactly.
3. Reorder the flow
Drag cards to change the sequence and build the workout in the order you want to follow.
4. Start the routine
Review the full workout, then start the timer and follow the cues as each block runs in sequence.
Custom Interval Timer FAQ
What is a custom interval timer?
A custom interval timer lets you build a workout with multiple blocks instead of repeating one fixed work and rest pattern.
Can I reorder the workout blocks?
Yes. You can drag and reorder the blocks to match the exact flow of your training session.
Is this custom timer good for HIIT and circuit training?
Yes. It works well for HIIT, circuits, boxing rounds, mixed conditioning sessions, and structured training plans.
Does it run in the browser without installing anything?
Yes. You can create and run the workout directly in your browser without downloading anything first.
Can I save my custom interval timer and name each group?
For saved timers, custom group names, and spoken group-name announcements during your workout, download the app version. The browser version is best for quick setup and fast use.