Box Breathing
Box breathing, also called square breathing, is a slow breathing pattern with four equal parts: breathe in for 4 counts, hold for 4, breathe out for 4, hold with empty lungs for 4 [1]. One round takes 16 seconds. It may help you settle in the moment, but studies are small and it is not a treatment.
In short
- What it is
- Four equal parts: in 4, hold 4, out 4, hold 4.
- One round
- 16 seconds; 8 rounds take about 2 minutes.
- When it helps
- Settling in a tense moment, like before a call. Studies are small.
- Who should be careful
- Pregnancy, heart disease, asthma, COPD, high blood pressure: ask your doctor.
Breathe in 4 · Hold 4 · Breathe out 4 · Pause 4
Never strain on the holds. If you feel dizzy, stop and breathe normally.
The circle grows as you breathe in, stays full during the first hold, shrinks as you breathe out and stays small during the second hold. The timer labels that last step "Pause".
Quietarium editorial team Updated Sources: 12
How to do box breathing (square breathing)
Square breathing is another name for it. Each of the four equal counts is one side of the square in the diagram below.
Start by breathing out. Emptying your lungs first makes the first count easier to follow. This is the standard box breathing technique, with the same 4-4-4-4 counts that Harvard Health describes [1].
- Breathe out slowly through your mouth until your lungs feel empty.
- Breathe in through your nose for a slow count of 4.
- Hold with full lungs for 4. Keep your shoulders loose.
- Breathe out through your mouth for 4.
- Hold with empty lungs for 4. The timer calls this step "Pause."
Then breathe in again. That is one round. Some yoga teachers call this equal-ratio pattern sama vritti, but the version with an empty hold is a modern adaptation.
The holds should feel like a pause. If you want to gulp air during a hold, the count is too long. Drop to 3.
How many rounds and how long should you do it?
Start with 8 rounds, about 2 minutes at 4 seconds per side.
Cleveland Clinic suggests 3 to 4 rounds, once or twice a day [2]. Mark Divine, who popularized the technique, recommends at least 5 minutes and says he practices 10 to 20 minutes a day [3]. Neither figure is a tested dose.
No study we found has compared different lengths. Our advice: 4 to 12 rounds is plenty for a first month. Stop earlier if you feel light-headed. The timer offers 4, 8, 12 or 20 rounds. If you want to sit quietly for a few minutes after the last round, use the meditation timer.
Which pace: 3, 4 or 5 seconds per side?
Use the longest side that never makes you gasp. If 4 seconds leaves you short of air by the second hold, shorten each side to 3.
| Seconds per side | Seconds per round | Breaths per minute | Share spent holding | Who it suits |
|---|---|---|---|---|
| 3 (3-3-3-3) | 12 | 5.0 | 50 % | beginners, or when holds feel hard |
| 4 (4-4-4-4) | 16 | 3.75 | 50 % | the standard version |
| 5 (5-5-5-5) | 20 | 3.0 | 50 % | when 4 feels easy |
| 4-7-8, for comparison | 19 | about 3.2 | 37 % (one hold) | evenings, long exhale |
In box breathing, exactly half of every round is a hold. All three paces are slower than the 10 breaths per minute used to define slow breathing in research [4], but those studies did not use holds, so the numbers do not carry over directly. Try each pace in the timer and keep the one that lets you follow the circle smoothly.
Does box breathing work? What do the studies say?
It may help you settle in the short term, but the studies are small and the results are mixed. Few trials test box breathing alone, and most of the strongest findings in this area belong to other kinds of breathing. The table sums up the abstracts.
| Study | Who and how | What it found | What it did not show |
|---|---|---|---|
| Balban 2023 [5] | Remote randomized trial, 5 minutes a day for 1 month. Box breathing, cyclic sighing and cyclic hyperventilation vs mindfulness. | Breathwork, especially cyclic sighing, improved mood and lowered breathing rate more than mindfulness (p < 0.05). | The abstract gives no result for box breathing alone. |
| Marchant 2025 [6] | 84 college students, each trying every condition. | Breathing at 6 breaths a minute raised heart rate variability more than square or 4-7-8 breathing (small to medium effects). | No condition changed blood pressure or mood. |
| McAllister 2026 [7] | Randomized trial, 66 people (22 per group) before a virtual stress test. | Box breathing and prolonged exhale both blunted the rise in heart rate, anxiety and a stress enzyme in saliva, compared with normal breathing. | Heart rate variability, cortisol and cognitive tests did not change. |
| Riedl 2026 [8] | Pilot, 47 students, 1 minute in real stressful situations. | Box breathing and cyclic sighing cut state anxiety more than doing nothing. | Reaction times were longer afterward. It was a pilot. |
| Kasap 2025 [9] | Crossover, 40 people, right after hard interval exercise. | Box breathing gave a higher heart rate than 6 breaths a minute (165 vs 155 bpm) and a higher effort rating. | Recovery time did not differ. |
| Dujawara 2026 [10] | Systematic review of randomized trials, 8 per the abstract. | Effective for short-term stress and emotional self-regulation. Effects on wider body functions were inconsistent. | The authors call the evidence "limited and fragmented." The abstract also mentions 29 trials, so we cite only its conclusion. |
Across these studies, box breathing seems to take the edge off a stress response in the short run. It did not beat slower breathing at 6 a minute, and it did not move cortisol, blood pressure or mood where those were measured. The Marchant team wrote that square and 4-7-8 breathing are popular with therapists but have "little empirical support" [6]. We would use it as a quick way to settle.
Box breathing for anxiety
It can take the edge off stress in the moment, but it is not a treatment for an anxiety disorder. The best small signals come from short stress tasks. In the McAllister trial, box breathing before a virtual stress test softened the rise in anxiety score [7]. In the Riedl pilot, one minute helped in real situations [8].
For breathwork in general, a 2023 meta-analysis found a small drop in anxiety (g = -0.32 across 20 trials). That covers many kinds of breathing, not box breathing alone. The authors also urged caution, to avoid a mismatch between hype and evidence [11].
Use it in a tense hour, for example before a call or in a waiting room. If anxiety is there most days, box breathing will not fix it, and a doctor or therapist can.
Box breathing vs 4-7-8: which is better?
Neither won in the best head-to-head study: slower breathing at 6 breaths a minute beat both. That is the Marchant result from the table above, where no condition changed blood pressure or mood [6].
Box is 16 seconds per round with two holds, and 4-7-8 is 19 seconds with one hold and an exhale twice as long as the inhale. Box is easier to remember. This table is our advice, built from the studies above.
| Situation | Better pick | What is known |
|---|---|---|
| Daytime, before a talk or exam | Box 4-4-4-4 | Quiet and easy to remember. Two small studies saw a short-term drop in anxiety during stress tasks [7][8]. |
| Evening, in bed | 4-7-8, or soft box (3-3-3-3) | We found no head-to-head sleep trial. Choose what feels comfortable. |
| Holds make you anxious or dizzy | Neither. Try breathing out longer than in, with no holds (4 in, 6 out) | Six breaths a minute gave the largest rise in heart rate variability, with mild over-breathing [6]. |
| Right after hard exercise | Not box | After intervals, box gave a higher heart rate than 6 breaths a minute [9]. |
| Panic | Neither as the first move | Read the help block at the bottom of this page. Slow your exhale. |
If you lean toward the longer exhale, read 4-7-8 breathing, step by step. If you want something for your hands to do, alternate nostril breathing uses your fingers to switch sides. For other options, see all breathing techniques.
Is box breathing used by Navy SEALs?
Not as an official SEAL method: former Navy SEAL officer Mark Divine popularized it and says he developed it after leaving the SEALs. In a 2016 TIME article, Divine wrote that it was a practice he created "to continue my breath training after the SEALs" [3].
We found no official Navy document that teaches it, so we do not state it as a SEAL method. Military and police units do teach a related practice called tactical breathing, a count-based pattern. In one small study of 30 people, it was compared with a prolonged exhale, and the exhale did better on a task under time pressure [12].
Who should skip it, and is box breathing dangerous?
For most healthy people it is low risk; stop if you feel dizzy, tingly or short of breath. The holds are the part to watch. If any of these fit, change the plan:
- If the holds make you dizzy, tingly or edgy, stop and breathe normally. Try 3-3-3-3, or drop the holds and breathe out longer than you breathe in.
- If you just finished hard exercise, wait. After intense intervals, box breathing raised heart rate and effort compared with slower breathing [9].
- If you are pregnant, or have heart disease, asthma, COPD or high blood pressure, ask your doctor before you practice breath holds.
- If you are in a panic attack, do not start with a count. Breathe out slowly and read the help block below. If holds make anxiety worse, try 5-4-3-2-1 grounding instead.
What does "longer exhale than inhale" mean?
It means breathing out for more counts than you breathe in, for example 4 in and 6 out. Marchant's best condition was a 4-in, 6-out rhythm at 6 breaths a minute [6], and McAllister's prolonged-exhale group blunted the stress response about as well as box [7]. A longer exhale has no holds, so it is a gentler place to start. You can try it with a timer on how to calm your nervous system. Two other exhale-led options have their own pages: the physiological sigh and belly breathing.
Frequently asked questions
Can I do box breathing lying down or before bed?
Yes, if the holds feel easy. We found no study of box breathing and sleep, so we cannot say it helps you fall asleep. If you try it in bed, use the 3-3-3-3 pace and keep your eyes closed.
How fast does box breathing work?
In one small pilot, students who did it for 1 minute during a real stressful situation reported less state anxiety than students who did nothing [8]. It was 47 people and a pilot, so treat it as a hint. Start with 2 minutes (8 rounds).
Can I do box breathing while walking or driving?
Not while driving. Holding your breath and watching a count can pull your attention off the road. Walking is fine if you keep the holds short, for example 3-3-3-3, and stop if you feel light-headed.
Should I keep my eyes open for the holds?
Either works. Open eyes help if closing them makes you dizzy or tense. Closed eyes help if you want to feel the breath instead of watching the timer. Pick the one that lets you keep breathing smoothly.
When to see a professional
Box breathing is a way to get through a tense moment. It does not treat the cause of anxiety. Talk to a doctor or a mental health professional if:
- anxiety or tension lasts most days, or keeps getting worse;
- you have panic attacks, or you avoid places because of them;
- you have a heart or lung condition and want to try breath holds;
- breathing exercises make you feel worse, not better.
This page is general information, not medical advice.
Stop the count and breathe the way you normally do. Sit down, loosen your shoulders and look around the room.
If you feel very bad right now
Emergency, US and Canada 911
If you are thinking about suicide or are afraid you might hurt yourself, call or text now. You do not have to wait until it gets worse.
- Updated
This page does not replace advice from a doctor. Medical disclaimer · Editorial policy
Sources: 12
- Solan M. Try this: Take a tactical breather. Harvard Health Publishing, October 1, 2023. health.harvard.edu (accessed October 18, 2026).
- Cleveland Clinic. Box breathing benefits and how to do it. health.clevelandclinic.org (accessed October 18, 2026). Cited for a practice suggestion only, not as evidence.
- Divine M. The Breathing Technique a Navy SEAL Uses to Stay Calm and Focused. TIME, May 4, 2016. time.com (accessed October 18, 2026).
- Zaccaro A, et al. How Breath-Control Can Change Your Life: A Systematic Review on Psycho-Physiological Correlates of Slow Breathing. Front Hum Neurosci. 2018;12:353. doi:10.3389/fnhum.2018.00353. PubMed 30245619.
- Balban MY, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Rep Med. 2023;4(1):100895. doi:10.1016/j.xcrm.2022.100895. PubMed 36630953.
- Marchant J, Khazan I, Cressman M, Steffen P. Comparing the Effects of Square, 4-7-8, and 6 Breaths-per-Minute Breathing Conditions on Heart Rate Variability, CO2 Levels, and Mood. Appl Psychophysiol Biofeedback. 2025;50(2):261-276. doi:10.1007/s10484-025-09688-z. PubMed 39864026.
- McAllister MJ, Martaindale MH, Sutton N, Andersen JP. Box breathing and prolonged exhalation reduces markers of physiological stress reactivity in response to a virtual trier social stress test. Compr Psychoneuroendocrinol. 2026;27:100360. doi:10.1016/j.cpnec.2026.100360. PubMed 42388906.
- Riedl EM, et al. Simply breathing anxiety away? A pilot, just-in-time ecological momentary intervention study of one-minute cyclic sighing versus box breathing as tools for acute anxiety reduction and attention promotion in real life. Anxiety Stress Coping. 2026;39(5):608-622. doi:10.1080/10615806.2026.2659809. PubMed 42002307.
- Kasap M, Aydin GR. Box breathing or six breaths per minute: Which strategy improves athletes post-HIIT cardiovascular recovery? PLoS One. 2025;20(11):e0336615. doi:10.1371/journal.pone.0336615. PubMed 41248139.
- Dujawara A, Ali K, Kumari S. Systematic Review of RCTs Evaluating Box Breathing for Stress, Autonomic, and Clinical Outcomes. Appl Psychophysiol Biofeedback. 2026 (online September 21). doi:10.1007/s10484-026-09812-7. PubMed 42768274.
- Fincham GW, Strauss C, Montero-Marin J, Cavanagh K. Effect of breathwork on stress and mental health: A meta-analysis of randomised-controlled trials. Sci Rep. 2023;13:432. doi:10.1038/s41598-022-27247-y. PubMed 36624160.
- Röttger S, Theobald DA, Abendroth J, Jacobsen T. The Effectiveness of Combat Tactical Breathing as Compared with Prolonged Exhalation. Appl Psychophysiol Biofeedback. 2021;46(1):19-28. doi:10.1007/s10484-020-09485-w. PubMed 32757097.