Last updated: March 2026
The Best Free Workout Timer Online
Over 300,000 gym-goers search monthly for a reliable workout timer, and most settle for clunky apps or basic stopwatches. This free interval timer is built for serious training — whether you're doing Tabata sprints, HIIT circuits, boxing rounds, or EMOM workouts.
The color-coded display changes your entire screen: green for work, red for rest, blue for set rest, yellow for get ready. In fullscreen mode, the timer is visible from across the gym. Audio beeps count down the last 3 seconds of each interval so you can focus on form, not the clock.
Every setting is customizable — work intervals from 5 to 300 seconds, rest periods from 0 to 300 seconds, 1 to 50 rounds, and up to 10 sets with separate set rest periods. Or skip the setup entirely and tap a preset to start training in seconds.
How to Use This Workout Timer
Step 1: Choose a preset (Tabata, HIIT 30/30, HIIT 40/20, EMOM, Boxing) or build a custom timer with your own work/rest intervals, rounds, and sets.
Step 2: Hit Start. A countdown gives you time to get in position. Then the timer guides you through every work and rest interval with color changes and audio cues.
Step 3: Use fullscreen mode for maximum visibility. Press spacebar to pause/resume. When you finish, review your workout summary including total time, work time, and estimated calories burned.
Popular Interval Training Protocols
Tabata (20/10 x 8). The gold standard of HIIT. Four minutes of maximum effort that improves both aerobic and anaerobic capacity. Research by Dr. Izumi Tabata showed this protocol increased VO2max by 14% in just 6 weeks.
HIIT 30/30. Equal work and rest periods give you enough recovery to maintain high intensity across all rounds. Ideal for running, cycling, or bodyweight exercises. Start with 10 rounds (10 minutes) and build up.
EMOM (Every Minute On the Minute). Perform a set number of reps at the start of each minute, then rest for the remainder. Self-regulating — as you fatigue, rest periods shrink naturally. Great for strength-endurance work.
Boxing Rounds (3min/1min). Standard boxing round structure. Three minutes of work mirrors professional rounds, with one minute to recover. Use for bag work, shadowboxing, or pad drills. Adjust to 2-minute rounds for beginners.
Frequently Asked Questions
What is an interval timer?
An interval timer alternates between work and rest periods for a set number of rounds. It's essential for HIIT, Tabata, circuit training, and boxing workouts. Instead of watching a clock, the timer tells you when to work and when to rest with visual and audio cues.
What is Tabata training?
Tabata is a specific HIIT protocol: 20 seconds of all-out effort followed by 10 seconds of rest, repeated for 8 rounds (4 minutes total). Developed by Dr. Izumi Tabata in 1996, research showed it improved both aerobic and anaerobic fitness more effectively than moderate-intensity cardio. Select the Tabata preset to get started instantly.
How many rounds should I do for HIIT?
For beginners, start with 6-8 rounds of 30 seconds work / 30 seconds rest (6-8 minutes). Intermediate athletes can do 10-15 rounds with shorter rest periods. Advanced athletes might do 8 rounds of 40 seconds work / 20 seconds rest. The key is maintaining high intensity during work periods — if you can't keep intensity up, reduce rounds.
Can I use this timer for boxing rounds?
Yes. The Boxing preset uses 3-minute rounds with 1-minute rest for 12 rounds, matching professional boxing round structure. You can customize round length (2 minutes for beginners, 3 for standard, 5 for Muay Thai) and rest periods. Audio cues at 3 seconds warn you the round is ending.
Does the timer work on my phone?
Yes. The timer is fully responsive and works on any phone browser. Use fullscreen mode to turn your entire screen into a color-coded display — green for work, red for rest — visible from across the gym. Audio cues play through your phone speaker or connected earbuds so you can train without watching the screen.