Breath Ratios

A ratio is the relative length of the four parts of a breath: inhale, retention after inhale, exhale, retention after exhale. Changing the ratio changes what the practice does, predictably.

The notation

Written as four numbers: inhale : hold in : exhale : hold out.

• 1:0:1:0 — equal breathing. Four in, four out.
• 1:0:2:0 — the extended exhale. Four in, eight out.
• 1:1:1:1 — box breathing. Four, four, four, four.
• 1:4:2:0 — the classical ratio. Four in, sixteen held, eight out.

Often shortened: "1:2 breathing" means inhale to exhale, no retentions.

Why ratios do anything

The autonomic nervous system has two branches — sympathetic, which mobilises, and parasympathetic, which settles — and the breath cycle shifts between them within every single breath.

Inhalation is mildly sympathetic. Heart rate rises slightly.

Exhalation is mildly parasympathetic. Heart rate falls slightly.

You can verify this in thirty seconds with a finger on your pulse. Breathe in slowly and feel it quicken; breathe out slowly and feel it slow.

So the ratio determines the proportion of each cycle you spend in each state. Bias towards the exhale and, over minutes, the overall balance shifts towards settling. Bias towards the inhale and it shifts the other way.

That is the entire mechanism. It is not subtle and it is not mystical.

The ratios worth knowing

Equal — 1:0:1:0

Start: four in, four out. Build to five and five, then six and six.

What it does: balances and steadies. Neither activating nor settling — it holds the middle.

When: before practice, before something requiring focus, and as the foundation everything else is built from.

How long: five to ten minutes.

Extended exhale — 1:0:2:0

Start: four in, six out. Then four in, eight out. Then five in, ten out if that is comfortable.

What it does: the strongest reliably settling practice there is. More time in the parasympathetic half of every cycle, sustained over minutes.

When: end of the day, before sleep, during or after stress, at the end of a practice before Savasana.

How long: five to fifteen minutes. Effect is usually noticeable within two.

This is the one to learn if you only learn one.

Box — 1:1:1:1

Start: four, four, four, four.

What it does: balancing with a strong attentional component — four things to track rather than two. The retentions add a mild stimulating quality that offsets the settling of the slow rate, so it produces an alert calm rather than drowsiness.

When: before something demanding. When you need to be steady and awake rather than relaxed.

How long: five to ten minutes.

Note: this includes retention. See the cautions below.

Extended inhale — 2:0:1:0

Start: six in, three out.

What it does: mildly activating. The reverse of the settling ratio.

When: morning, low energy, before physical practice. Rarely used and worth knowing about because it explains why the extended exhale works.

How long: two to five minutes. Longer produces over-breathing.

Classical — 1:4:2:0

Four in, sixteen held, eight out.

What it is: the traditional full ratio described in classical texts. It is an advanced practice with a long retention, and it should be built over years and learned with a teacher. Included here so you know what people are referring to; not something to attempt from a written description.

Building capacity

Start below your maximum. If four in and eight out is your ceiling, work at three and six. A ratio practised at the edge becomes strain, and strain triggers the stress response you are trying to reduce.

Extend the exhale before extending the inhale. More useful and much safer.

Add one count at a time, and stay there for a week or two. The count should feel unremarkable before you increase it.

Use a metronome or a clock only if you need it. Most people count internally, and the internal count naturally slows as the practice deepens, which is fine.

The signs you have gone too far

A desperate inhale at the end of the cycle. The exhale is too long.

Light-headedness. Over-breathing. Reduce volume, not just length — take smaller breaths, not just slower ones.

Tension in the jaw, throat or shoulders. Effort is leaking into places it does not belong.

The rhythm breaking. If you cannot maintain the count for the whole session, reduce it.

Any of these: drop back to the ratio you can hold comfortably, and stay there for a fortnight.

On retention

Retentions add power and they add risk. A few rules:

Learn without them first. Several months of ratio work with no holds.

Start with two seconds. Not four, not eight.

After the inhale is safer to begin with than after the exhale.

Never in these cases: uncontrolled blood pressure, heart conditions, epilepsy, glaucoma, pregnancy, or a history of panic. Do the ratios without retention — the extended exhale is safe and does most of the work anyway.

A practical progression

Weeks 1–2: notice the breath, no counting, five minutes daily.

Weeks 3–4: equal breathing, 4:4, five to ten minutes.

Weeks 5–8: 4:6, then 4:8. Ten minutes.

Months 3–6: lengthen the base count — 5:10, then 6:12 if comfortable.

Month 6 onwards: add short retentions, if appropriate for you, two seconds at first.

Most people never need to go past 4:8, and there is nothing wrong with staying there indefinitely. It works.