Box Breathing App
Free 4-4-4-4 Timer
The breathing technique used by Navy SEALs to stay calm under pressure. Free guided timer with Apple Watch & Wear OS support.
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Box Breathing Timer
Four seconds in, four hold, four out, four hold. Start it here in your browser, with no sign-up and nothing to install.
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What is Box Breathing?
Box breathing, also called square or tactical breathing, is a paced pattern with four equal phases: inhale for four seconds, hold for four, exhale for four, and hold empty for four. Each breath takes 16 seconds, under four breaths a minute. The equal count gives a busy mind something simple and steady to follow.
Box breathing (also called square breathing or tactical breathing) is a technique where you breathe in equal intervals: 4 seconds inhale, 4 seconds hold, 4 seconds exhale, 4 seconds hold.
It's called "box" breathing because the four equal phases form a square when visualized. This simple pattern is powerful because it:
Box breathing is one of several guided formats. We compare the rest in best guided breathwork apps and guided breathwork.
- Activates your parasympathetic nervous system (calming response)
- Slows breathing, which shifts the body toward rest
- Improves focus and mental clarity
- Can be done anywhere, anytime in just 1-2 minutes
Used by: Navy SEALs, first responders, athletes, surgeons, and anyone who needs to perform under pressure.
How do you do box breathing?
Breathe out fully, then inhale through the nose for a count of four, hold with the lungs full for four, exhale steadily for four, and hold with the lungs empty for four. That is one breath. Repeat for two to eight minutes, keeping the holds relaxed rather than clenched, and shorten every phase to three if four feels strained.
Sit upright and breathe out
Sit with your back supported and shoulders relaxed. Empty your lungs with one slow exhale.
Inhale for four
Breathe in through the nose for a count of four, letting the belly expand.
Hold for four
Hold with the lungs full for four. Keep the throat and shoulders soft.
Exhale for four
Breathe out steadily, through the nose or mouth, for a count of four.
Hold empty for four
Rest with the lungs empty for four before the next inhale.
Repeat for two to eight minutes
Continue the cycle. If four feels strained, use three for every phase and build up.
What are the benefits of box breathing?
In a month-long randomised trial, box breathing was one of three five-minute daily breathing practices that, together, improved mood more than mindfulness meditation; Cyclic Sighing had the largest effect. Under lab stress, box-style tactical breathing kept physiological arousal lower than prolonged exhalation. Slow breathing in general reliably raises heart rate variability.
Better mood than meditation, as part of daily breathwork
Box breathing was one arm of a remote randomised trial of 5-minute daily practices over a month. Breathwork as a whole improved mood and lowered resting breathing rate more than mindfulness meditation, with exhale-focused Cyclic Sighing strongest. [1]
Lower arousal under pressure
During a timed, noisy lab task, tactical (box-style) breathing produced lower physiological arousal than prolonged exhalation, although prolonged exhalation gave better task performance. [2]
Slow breathing raises HRV
At under four breaths a minute, box breathing is slow breathing, which a meta-analysis found raises vagally mediated heart rate variability during and after practice. [3]
Who should not do box breathing?
Box breathing is slow and gentle, so most healthy adults can do it. The two four-second holds are the only real caution: holding the breath briefly raises blood pressure. With uncontrolled high blood pressure, heart disease or pregnancy, shorten or drop the holds, or use Extended Exhale instead. Stop if you feel light-headed.
- Uncontrolled high blood pressure, heart disease or a history of stroke: shorten or skip the holds
- Pregnancy: brief, comfortable pauses are usually fine; avoid straining holds and check with your provider
- Panic disorder: the empty-lung hold can feel like air hunger; an exhale-led pattern may suit better
- Lung disease: follow your respiratory team's advice on breath holding
Never practise breath holds in or near water or while driving.
Read the full breathwork safety guidelines and the guide to breathwork contraindications. This is general education, not medical advice.
How does Vayu guide box breathing on the wrist?
On Apple Watch and Wear OS each four-second inhale is a ramp of taps that starts fast and slows, each hold clicks once a second so you can count four without looking, and each exhale is a ramp from slow to fast. A short silence marks the end of each breath, so you can practise with your eyes closed.
Holds you can count
Four soft clicks mark each hold, one per second. A single buzz at each phase change cannot tell you how far through a hold you are.
Two to eight minutes
Box runs for 2, 4, 6 or 8 minutes on the watch, with 4 as the default, and the watch traces the breath around a square.
Phone optional
The whole session runs on the watch, so the phone can stay in a pocket or another room.
HRV after, not during
When the session ends, Vayu reads the HRV (SDNN) your watch recorded and uses it to shape the next session. It does not measure HRV while you breathe.
How every phase feels on the wrist, and why HRV is read after the session rather than during it, is explained on the haptic breathing page.
Why Choose Vayu for Box Breathing?
A clean, focused app that does one thing exceptionally well
Visual Timer
Clean, calming animation guides each breath phase. No counting required.
Smartwatch Support
Native apps for Apple Watch and Wear OS with haptic guidance.
Works Offline
No internet needed. Practice anywhere, anytime.
Customizable
Hold the 4-4-4-4 pattern steady; build duration before changing the count.
When to Use Box Breathing
Quick sessions that fit into your day
Before Meetings
2 minutes of box breathing before important meetings reduces stress and improves clarity.
During Work
Quick reset when feeling overwhelmed. Use your smartwatch for discreet practice.
Pre-Sleep
Wind down before bed with longer box breathing sessions for better sleep.
Athletic Performance
Athletes use box breathing before competition to enter a focused, calm state.
Start Box Breathing in Seconds
No sign-up, no tutorial, no friction. Download, open, breathe.
- A free guided session to start, no ads
- Works on iPhone, iPad, Android
- Apple Watch & Wear OS apps included
- Browser timer above needs no account
Inhale • Hold • Exhale • Hold
One complete cycle = 16 seconds
4 cycles = just over 1 minute
Frequently Asked Questions
What is the best box breathing app?
Vayu offers a clean visual timer, haptic guidance on Apple Watch and Wear OS, and customizable intervals, with no ads. You get one guided session free when you sign up; box breathing and the rest of the technique library are part of Pro, which is $59.99 a year with a 7-day free trial.
Is box breathing the same as square breathing?
Yes, box breathing and square breathing are the same technique. It's called "box" or "square" breathing because the four equal phases (inhale-hold-exhale-hold, each 4 seconds) form a square pattern when visualized.
How do I do box breathing with a timer?
A box breathing timer guides you through each 4-second phase: inhale for 4 seconds, hold for 4 seconds, exhale for 4 seconds, hold empty for 4 seconds. The Vayu app provides visual and haptic cues so you don't need to count yourself.
Can I use box breathing on Apple Watch?
Yes! Vayu has a native Apple Watch app for box breathing. It uses gentle haptic taps to guide each breath phase, so you can practice with your eyes closed or during meetings without looking at a screen.
Explore More Breathing Techniques
Ready to Try Box Breathing?
Take the timer with you. Vayu taps the rhythm on your wrist, so you can practise with your eyes closed and your phone in your pocket.
Other breathing techniques
One page per technique. The full list with patterns is on the pranayama and breathing techniques hub.
- 4-7-8 breathing (4-7-8)Inhale for 4, hold for 7, exhale for 8. A long hold and a longer exhale, most often used to wind down before sleep.
- Cyclic Sighing (3-1-6)Two inhales through the nose, then one long exhale through the mouth, repeated for about five minutes. Vayu paces it 3-1-6.
- Extended Exhale (3-2-6-2)An exhale twice as long as the inhale, with short pauses. Vayu paces it 3-2-6-2 for calm without long holds.
- Coherent breathing (5 to 6 breaths per minute)Slow, even breathing at about 5 to 6 breaths a minute, the range where heart rate variability responds most.
- Anulom Vilom (4-2-6-2)Breathing through one nostril at a time, alternating sides. Vayu paces it 4-2-6-2, or 2-1-3-1 on the fast setting.
- Bhastrika (4-2-4-2)Full, forceful breaths in and out through the nose. Vayu paces it as deliberate rounds, 4-2-4-2 by default.
- Kapalbhati (60 exhales per minute (normal speed))Short, sharp exhales driven by the belly, with passive inhales between them. Vayu paces one exhale per second by default.
Sources
- Balban et al. 2023, Cell Reports Medicine: brief structured respiration practices enhance mood and reduce physiological arousal. Randomised controlled trial of 5 minutes a day for a month: cyclic sighing, box breathing and cyclic hyperventilation against mindfulness meditation
- Röttger et al. 2021, Applied Psychophysiology and Biofeedback: the effectiveness of combat tactical breathing as compared with prolonged exhalation. Under lab stress, tactical (box-style) breathing gave lower physiological arousal and prolonged exhalation gave better task performance
- Laborde et al. 2022, Neuroscience and Biobehavioral Reviews: effects of voluntary slow breathing on heart rate and heart rate variability, a systematic review and meta-analysis. Voluntary slow breathing raised vagally mediated HRV during the session, straight after it, and after multi-session programmes
