5-Minute HIIT Timer

What this timer runs

Work

30 seconds

Rest

30 seconds

Rounds

5

Work and rest

4:30

Countdown

10 seconds before the first round

Every field above is editable — this is the free web timer, opened on one setting rather than an empty one. For what HIIT is and how to run it, HIIT Timer is the page above this one.

Questions

How many rounds is a 5-minute HIIT session?

5, at 30 seconds of work and 30 of rest. That comes to 4:30 of work and rest; the ten-second countdown before the first round is what makes it 5 minutes on the wall clock.

Can I change the intervals?

Yes. The dial opens on this setting and every field is editable — change the work, the rest or the round count and the total updates as you type. Nothing is saved, and there is nothing to sign up for.

Does it keep running if my screen locks?

In the browser, not reliably — a phone that locks will stop the tab. That is what the iOS app is for: it keeps the clock and the spoken cues running in the background, and on the Apple Watch it taps your wrist at every switch.

Other lengths

• 15-Minute HIIT Timer45 seconds on · 15 seconds off · 15 rounds · 14:45 of work and rest
• 20-Minute HIIT Timer40 seconds on · 20 seconds off · 20 rounds · 19:40 of work and rest
• 30-Minute HIIT Timer45 seconds on · 15 seconds off · 30 rounds · 29:45 of work and rest
• 45-Minute HIIT Timer45 seconds on · 15 seconds off · 45 rounds · 44:45 of work and rest