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Simple HIIT Timer

Start a simple HIIT workout instantly. No setup required.

READY
ROUND 1 / 10
00:30

Runs entirely in your browser. No installation needed.

Simple HIIT Timer: Guide

Intent
Free HIIT timer online for a simple 10-minute session: 30s work / 30s rest for 10 rounds. Start instantly and follow the transitions.
What it does
Runs a fixed HIIT workout with beeps for transitions and the last few seconds, plus pause/resume and a sound toggle.
Key features
30/30 x 10 rounds, Sound toggle, Pause/resume
Privacy
Runs locally in your browser. No sign-in, no tracking.
Best for
  • A quick 10-minute HIIT block when you do not want to program intervals
  • Warm-ups, finishers, or treadmill/bike 30/30 routines
  • Anyone searching 'HIIT timer online' or '30 30 timer'
Why this tool
  • Fixed 10-round structure for zero setup
  • Clear beeps for transitions and the finish so you can focus on effort
  • Local-first: no sign-in and no tracking

How to use

  1. 1Press START to begin the first WORK phase.
  2. 2Follow the WORK/REST label and the on-screen timer.
  3. 3Use PAUSE/RESUME if needed.
  4. 4Press RESET to return to READY and restart from round 1.

Common mistakes

  • Expecting custom round counts (this tool is fixed by design).
  • Sound is toggled off, so transitions are silent.
  • Screen sleep or backgrounding the tab on mobile can affect timers.

Examples

10-minute HIIT circuit
10 rounds total WORK: 30s (push hard) REST: 30s (recover)
Treadmill intervals (simple)
WORK: fast run REST: walk Repeat for 10 rounds

Related tools

Simple Tabata Timer
For a shorter 4-minute 20/10 Tabata protocol.
Interval Timer
For custom work/rest intervals with unlimited rounds.
EMOM Timer
For minute-based rounds (start work each minute).
AMRAP Timer
For continuous effort blocks without interval switching.

Workflows (kits)

Focus & Training Timers Kit
Find a timer that matches your training structure.