4 Second Box Breathing Timer Online

What is Box Breathing?

Box breathing (also called square breathing or four-square breathing) is a powerful breathing technique used by Navy SEALs, athletes, and anyone looking to quickly reduce stress and improve focus. It consists of four equal phases — each lasting the same number of seconds — forming a perfect "box" shape in timing.

The default pattern is 4-4-4-4: breathe in for 4 seconds, hold for 4 seconds, breathe out for 4 seconds, hold for 4 seconds. You can increase the seconds using the control above for a deeper practice.

How to Do Box Breathing

1. Sit upright in a comfortable position. Relax your shoulders.
2. Breathe in slowly through your nose for 4 seconds.
3. Hold at the top — lungs full — for 4 seconds.
4. Breathe out steadily through your mouth for 4 seconds.
5. Hold at the bottom — lungs empty — for 4 seconds.
6. Repeat for as many cycles as you wish. Start with 4 cycles, build to 8 or more.

Adjusting the Seconds

Use the + / − controls to change the seconds per phase. All four phases stay equal — that is what makes it "box" breathing. Common progressions:

• 4 seconds — beginner / daily calm
• 5–6 seconds — intermediate / deeper focus
• 7–8 seconds — advanced / strong stress relief

Benefits of Box Breathing

• Quickly resets the nervous system under high stress
• Improves concentration and decision-making clarity
• Lowers cortisol and heart rate in minutes
• Helps with anxiety, overwhelm, and pre-performance nerves
• Used by military, surgeons, athletes, and meditators worldwide
• Works before bed, before presentations, or any time you need to reset

Try Other Breathing Timers

• 4-7-8 Breathing Timer — The classic sleep and anxiety method: 4s in, 7s hold, 8s out.
• 4-2-4 Breathing Timer — Gentle balanced breathing: 4s in, 2s hold, 4s out. Great for beginners.
• HRV Breathing Timer — 6s inhale, 6s exhale, no holds. 5 breaths per minute for heart rate variability.
• Custom Breathing Timer — Build any phase pattern with individual seconds per phase.