Tip: press Space to start / pause. Screen stays awake while running.
15 Minute HIIT Workout Timer
This is the standard HIIT session length — long enough for a proper warm-up, several hard rounds and a cooldown.
How to use this timer
Warm up first, press Start, and work through your rounds. Turn on voice cues so you don't have to watch the screen.
About this length
A 15-minute HIIT workout timer for a full high-intensity session. Start it at the first exercise and push until the alarm. The colour shift in the last minute tells you when to empty the tank.
More timers like this one are listed on the workout timers page.
Frequently asked questions
How long is a 15-minute hiit workout timer?
It counts down exactly 900 seconds (15 minute) and then plays an alarm that loops until you dismiss it.
Why choose 15 minute for hiit workout?
This is the standard HIIT session length — long enough for a proper warm-up, several hard rounds and a cooldown.
Does it keep running if I switch tabs?
Yes. The countdown is anchored to a real end-timestamp, so a throttled background tab still finishes at the right moment.
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