Tools

Diaphragmatic Breathing Timer

Slow, belly-deep breathing calms the body's stress response. Follow the visual, breathe with the rhythm, and adjust the pace until it feels comfortable — a longer exhale than inhale is what does the settling.

Ready when you are

Press start to begin

What is diaphragmatic breathing?

Diaphragmatic breathing, often called belly breathing, means breathing slowly and deeply enough that the diaphragm — the dome-shaped muscle beneath your lungs — does the work. Your belly expands on the in-breath while your chest and shoulders stay relatively still. Breathing this way stimulates the vagus nerve and shifts the nervous system toward its parasympathetic “rest and digest” state, which slows the heart, lowers physiological arousal, and eases the bodily symptoms of stress, anxiety, and panic.

Slow breathing is one of the most researched self-regulation skills in psychology. Systematic reviews link diaphragmatic and slow-paced breathing to reduced physiological and psychological stress (Hopper et al., 2019; Zaccaro et al., 2018), and a randomized trial found that brief daily breathing practice improved mood and reduced arousal — with exhale-emphasized breathing performing best (Balban et al., 2023). That is why this timer defaults to an exhale three times longer than the inhale.

How to use this breathing timer

  1. Sit or lie somewhere comfortable, one hand on your belly if that helps you feel the movement.
  2. Press Start and breathe in through your nose as the water rises (or the circle expands).
  3. Hold gently while the visual pauses — no straining.
  4. Breathe out slowly through pursed lips as the water falls, letting the long exhale empty you out.
  5. Repeat for a few minutes. Three to five minutes once or twice a day is a solid practice; regularity matters more than duration.

Breathing patterns you can set

Every phase is adjustable, so the same timer covers the most widely used paced-breathing techniques. Pick one from the Presets dropdown in Settings, or dial in your own:

  • Extended Exhale (advanced): inhale 5, hold 7, exhale 23 — A long, slow exhale to maximize the calming effect on the nervous system.
  • Box Breathing: inhale 4, hold 4, exhale 4, hold 4 — Equal-count breathing used to stay calm and focused under pressure.
  • 4-7-8 Breathing: inhale 4, hold 7, exhale 8 — A relaxing breath often used to unwind before sleep.
  • Coherent Breathing: inhale 5, hold 0, exhale 5 — Equal, holdless breathing at about six breaths a minute, linked to improved heart-rate variability.

Slow breathing is a helpful companion skill for generalized anxiety, panic attacks, and everyday stress — and it pairs well with the therapy approaches described across this site. If anxiety is interfering with your life, breathing exercises are a support, not a substitute for treatment; you can read about how therapy can help or browse our Ontario mental health resources.

Frequently asked questions

What is diaphragmatic breathing?

Diaphragmatic breathing (also called belly breathing) means breathing slowly and deeply so the diaphragm — the muscle under your lungs — does the work, letting your belly expand rather than your chest and shoulders. Breathing this way stimulates the vagus nerve and activates the parasympathetic nervous system, the body’s “rest and digest” state, which lowers heart rate and eases the physical symptoms of stress and anxiety.

Why is the exhale longer than the inhale?

A longer exhale is what does most of the calming. Your heart naturally slows slightly on every out-breath (vagal activity increases during exhalation), so extending the exhale — like the 5-second inhale and 23-second exhale this timer defaults to — tips the nervous system toward its calming, parasympathetic state. Research on exhale-emphasized breathing shows it is particularly effective at reducing physiological arousal and improving mood.

How long and how often should I practise breathing exercises?

A few minutes once or twice a day is enough for most people — consistency matters more than duration. Three to five minutes of slow, diaphragm-led breathing daily is a common starting point, and it is most useful when practised regularly rather than only during moments of high anxiety, so the skill is well-rehearsed when you need it.

Can I use this timer for box breathing or 4-7-8 breathing?

Yes. All four phases are independently adjustable, so you can set box breathing (4-4-4-4), 4-7-8 breathing (inhale 4, hold 7, exhale 8), coherent breathing (5-5 or 6-6 with no holds), or any custom pattern your clinician has suggested. Holds can be set to zero and are skipped automatically.

Is it normal to feel light-headed during breathing exercises?

Mild light-headedness usually means you are breathing more deeply or quickly than your body is used to. Slow down, make the breaths smaller, or return to normal breathing for a minute — comfort always comes first. If light-headedness persists, or you have a respiratory or cardiovascular condition, check with your healthcare provider before practising paced breathing.

References

  • Ma, X., Yue, Z.-Q., Gong, Z.-Q., et al. (2017). The effect of diaphragmatic breathing on attention, negative affect and stress in healthy adults. Frontiers in Psychology, 8, 874.
  • Zaccaro, A., Piarulli, A., Laurino, M., et al. (2018). How breath-control can change your life: A systematic review on psycho-physiological correlates of slow breathing. Frontiers in Human Neuroscience, 12, 353.
  • Balban, M. Y., Neri, E., Kogon, M. M., et al. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 4(1), 100895.
  • Hopper, S. I., Murray, S. L., Ferrara, L. R., & Singleton, J. K. (2019). Effectiveness of diaphragmatic breathing for reducing physiological and psychological stress in adults: A quantitative systematic review. JBI Database of Systematic Reviews and Implementation Reports, 17(9), 1855–1876.