Custom Interval Timer
Set prepare, work and rest seconds and the number of rounds, then run a full interval timer with big display, round counter and sound alerts for training, boxing or classroom drills.
Ready
00:00
Round 0 of 0
Set your intervals and press Start. Keep this tab open — sound alerts play at every phase change.
How to use
- Enter prepare, work and rest seconds and the number of rounds.
- Press Start and follow the big timer — it beeps at every phase change and three times at the finish.
- Pause any time, and Reset to return to your settings.
Timing is based on the device clock, so it stays accurate even if the screen redraws late. Sound uses the browser Web Audio API and starts only after you press Start, as browsers require a user action for audio.
Frequently Asked Questions (FAQ)
What does the custom interval timer do?
It builds custom prepare, work and rest intervals with a round counter, big display and sound alerts for training, boxing or classroom drills.
Does it make sound alerts?
Yes. It beeps at every phase change and three times at the finish.
Can I pause or reset the timer?
Yes. Pause any time, and Reset returns you to your settings.
Is the custom interval timer free?
Yes, it is free with no signup, and everything runs in your browser.